Mary has scored 78, 60, 82, 94, and 88 on her previous fice tests.
What score does she need on her next test so that her average (mean) is 80?
Let x be the next test score
Recall that the mean is given by
[tex]mean=\frac{\text{sum of test scores}}{total\text{ numbers of tests}}[/tex]We have the following information,
mean = 80
sum of test scores = 78 + 60 + 82 + 94 + 88 + x = 402 + x
total number of tests = 6
So, let us substitute these values into the above formula
[tex]\begin{gathered} mean=\frac{\text{sum of test scores}}{total\text{ numbers of tests}} \\ 80=\frac{402+x}{6} \\ 6\times80=402+x \\ 480=402+x \\ 480-402=x \\ 78=x \\ x=78 \end{gathered}[/tex]Therefore, Mary need to score 78 on her next test so that her mean is 80
I need help with this question but no one is helping me! Can someone please help me.
Step-by-step explanation:
"with replacement" is important.
that means that the mixture of the marbles and therefore the chances to pull certain marbles does not change with the previous pull.
a probability is always
desired cases / totally possible cases
we have 14 marbles in the bag
4 orange
2 green
8 purple
the probability to pull an orange marble is therefore
4/14 = 2/7
the probability to pull a green marble is therefore
2/14 = 1/7
the probability to pull a purple marble is therefore
8/14 = 4/7
a.
a green marble is pulled AND then a purple marble is selected.
we need to combine both probabilities for one combined event :
1/7 × 4/7 = 4/49
b.
a purple marble and then a green marble is selected.
4/7 × 1/7 = 4/49
since we replace the marbles after every pull, both probabilities are the same, of course.
every pull has the same probability for each desired event.
c.
2 orange marbles are selected.
2/7 × 2/7 = 4/49
d.
2 non-orange marbles are pulled
there are 10 non-orange marbles. so this is
10/14 × 10/14 = 5/7 × 5/7 = 25/49
suppse that you buy and exerice ball with diameter of 85 cm and your brother buys and exercise ball with 65 cm what is the diffrence bewtween the volume and surface are of both balls? round to the nearest 100
Given:
• Diameter of my ball = 85 cm
• Diameter of my brother's ball = 65 cm
Let's find the difference between the volume of the both balls and also let's find the difference between the surface area of both balls.
A ball has the shape of a sphere.
Therefore, we have the following formulas:
• Volume of a sphere formula:
[tex]V=\frac{\pi d^3}{6}[/tex]• Surface area of a sphere formula:
[tex]A=\pi d^2[/tex]Where d is the diameter.
• Now, to find the difference between the volume of both balls, we have:
[tex]V_1=\frac{\pi d^3}{6}=\frac{\pi85^3}{6}=321555.09\approx321555\text{ cm}^3[/tex]The volume of my ball is 321555 cubic cm.
[tex]V_2=\frac{\pi *65^3}{6}=143793.3\approx143793\text{ cm}^3[/tex]Volume of my brother's ball is 143793 cubic cm.
Therefore, to find the difference between the volume of both balls, we have:
V = V1 - V2 = 321555 - 143793 = 177762 cm³ = 177800 cm³
The difference between the volume of both balls is 177800 cm³
• Now for the surface area, we have:
[tex]A_1=\pi d^2=\pi *85^2=22698.01=22698\text{ cm}^2[/tex]The surface area of my ball is 22698 cm²
For surface area of my brother's ball:
[tex]A_2=\pi d^2=\pi *65^2=13273.23\approx13273\text{ cm}^2[/tex]The surface area of my brother's ball is 13273 cm².
Difference of surface areas:
A = A1 - A2 = 22698 - 13273 = 9425 cm² = 9400 cm²
Therefore, the difference between the surface area of both balls is 940O cm².
ANSWER:
• Difference between volume of both balls= 177800 cm³
• Difference between the surface area of both balls = 9400 cm²
Multiply.3/5⋅3/4Enter your answer as a fraction in simplest form in the box.
Hello!
We have the following multiplication:
[tex]\frac{3}{5}\times\frac{3}{4}[/tex]To solve it, we have to multiply numerator with numerator and denominator with denominator, look:
[tex]\frac{3}{5}\times\frac{3}{4}=\frac{3\times3}{5\times4}=\frac{9}{20}[/tex]So, the fraction in is the simplest form is 9/20.
what is the answer to 7 3/16 + 4 5/48
Answer:
[tex]11\frac{14}{48}[/tex]
Step-by-step explanation:
[tex]7\frac{3}{16}+4\frac{5}{48}[/tex]
First, make these improper fractions.
[tex]\frac{115}{16} +\frac{197}{48}[/tex]
And now to add these fractions, make the denominators the same.
For that, multiply both the numerator and denominator of the fraction 115/16 by 3.
[tex]\frac{115*3}{16*3} +\frac{197}{48}\\\\\frac{345}{48} +\frac{197}{48}\\\\\frac{542}{48} \\\\=11\frac{14}{48}[/tex]
Nancy is buying a new pair of boots. The store is having a sale and all boots are 20% off. Part A Choose an expression that can represent the sale price of the boots where x is the original price of the boots (0.2x, 0.8x, 1.2x) Part B Thus means that the sale price of the boots is (20%, 80%, 120%) of the original. cost
Answer:
Part A: 0.8x
Part B: 80% of the original price.
Explanation:
Part A:
The store sells the boots at a sale price of 20% off, meaning the price of the shoes is 100% - 20 % = 80% of the original price. If we call x the original price, then the sale price would be
[tex]\frac{80}{100}\times x[/tex][tex]=0.8x[/tex]Part B:
The sale price of the boots is 100% - 20% = 80% of the original price.
HELP ASAP WILL GIVE BRAINLEST Write 4,650,000,000 in scientific notation.
4.65 x 10−9
4.65 x 109
465 x 10−7
465 x 107
Answer:
(b) 4.65×10⁹
Step-by-step explanation:
You want 4,650,000,000 written in scientific notation.
Scientific NotationA number is written in scientific notation in the form shown in the second attachment. The coefficient has one digit to the left of the decimal point. The remaining significant digits of the number are to the right of the decimal point.
The exponent is the same as the exponent of the place value of the most significant digit of the number. Some of those exponents are shown in the first attachment.
ApplicationThe given number has its most significant digit (4) in the "billions" place. The corresponding exponent of 10 is 9. Putting 4 to the left of the decimal point, the number is written in scientific notation as ...
4.65×10⁹
__
Additional comment
In the above, we have used the superscript font to indicate the exponent. In plain text, an exponent is indicated with a caret (^), as in 4.65·10^9.
If you use an "x" character for a multiplication symbol, you need to make sure it cannot be confused with a variable named "x".
In spreadsheets and some calculators, the base and exponent are written as "E". Here, the number would be 4.65E9. (This is a carryover from one of the earliest high-level computer programming languages.)
(You will notice that the number in the second attachment is similar to, but not the same as, the one given in this problem statement. We intend that attachment to show the format, not the answer to this question.)
The population of an endangered species of fish living in a controlled habitat is given by the equation P = 7t + 46, where Pis the population and t is the time in months since the population was introduced into the habitat. Graph the equation using t = 0, 6, 12, and 18. (100 pts)
Graph is attached. It will be a linearly increasing line.
Population for 0 months is 46
Population for 6 months is 88
Population for 12 months is 130
Population for 18 months is 172.
Given,
The equation for population, P = 7t + 46
P is the population
t is the time in months
We have to graph the equation using
t = 0, 6, 12 and 18.
For this we have to find P
1. t = 0
P = 7t + 46 = 7 × 0 + 46 = 0 + 46 = 46
2. t = 6
P = 7t + 46 = 7 × 6 + 46 = 42 + 46 = 88
3. t = 12
P = 7t + 46 = 7 × 12 + 46 = 84 + 46 = 130
4. t = 18
P = 7t + 46 = 7 × 18 + 46 = 126 + 46 = 172
The graph is given below and it will be a linearly increasing line.
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Hannah's friend Ami would like the group of 5 performers to include more.
males than females. The order in which they perform is no longer
relevant.
iii) Find the number of different selections of 5 performers with more
males than females.
iv) Two of the applicants areMr andMrs Blake. Find the number of
different selections that include Mr and Mrs Blake and also fulfil Ami's.
requirement.
Answer:
iii) 501
iv) 110
Step-by-step explanation:
See picture
Lynn Golding is employed as a payroll supervisor and earns $18 per hour. This pay period she worked 40 hours. She is married and claims 6 allowances. The state tax is 3.0% of gross earnings, and the local tax is 1.5% of gross earnings. Lynn pays $35 for medical insurance and $17 in union dues. Calculate Gross pay, net pay, federal income tax, social security, Medicare, State, Local, Medical and Union Dues.
The earnings and deductions, are given as follows:
Gross pay: $720.Net pay: $498.07.Federal income tax: $82.45.Social security tax: $44.64.Medicare tax: $10.44.State tax: $21.60.Local tax: $10.80.Medical due: $35.Union due: $17.What are her earnings and deductions?First we find her gross earning, which is given by the hourly wage multiplied by the number of hours worked, hence:
Gross pay = 40 x 18 = $720.
Hence her yearly income is given by:
Yearly income = 52 x 720 = $37440.
Meaning that her federal tax rate is of $19.76 a week plus 12% of the excess over $197.60, then:
Federal tax = 19.76 + 0.12 x (720 - 197.60) = $82.45.
The social security tax rate is of 6.2% of her gross weekly earnings, hence it is given by:
Social Security = 0.062 x 720 = $44.64.
The medicare tax rate is of 1.45% for Lynn(employee), hence:
Medicare = 0.0145 x 720 = $10.44.
The state tax is 3% of her gross earnings, hence:
State tax = 0.03 x 720 = $21.60.
The local tax is 1.5% of her gross earnings, hence:
State tax = 0.015 x 720 = $10.80.
The medical and union dues are stated in the problem, hence the sum of all discounts is given by:
82.45 + 44.64 + 10.44 + 21.60 + 10.80 + 35 + 17 = $221.93.
The net pay is the gross pay subtracted by the discounts, hence:
Net pay = 720 - 221.93 = $498.07.
Missing informationThe value of an allowance is not stated, hence they are not considered for the calculations.
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20 more than half a number is 70 what is the number
consider the function h(x)=(1/64)(x^5+16x^3). It can be seen from the graph that h(x) is one-to-one and so has an inverse function h^-1(x). Compute the slope of each respective graph at this point.
(h^-1)'(-32)=
The numeric value of the slope of the inverse function at x = -32 is given by:
(h^-1)'(-32) = 0.03.
How to find the inverse of a function?To find the inverse of a function, we exchange x and y in the original function, then isolate y.
This means that if the original function has a point (x,y) graphed, the inverse will have point (y,x) graphed.
From it's graph, the function h(x) has these two following points:
(-4.552, -32) and (-4.555, -32.1)
Hence the inverse will have these two following points:
(-32, -4.552) and (-32.1, -4.555).
The slope is given by change in y divided by change in x, hence:
(h^-1)'(-32) = (-4.552 - (-4.555))/(-32 - (-32.1)) = 0.03.
Which is also equivalent to the derivative of the inverse function at x = -32.
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please follow directions and refer to rubric Will mark brainliest
screenshots attached thank you I really need this
Answer:
Step-by-step explanation: To find the x-intercept, substitute in
0
for
y
and solve for
x
. To find the y-intercept, substitute in 0 for x
and solve for y
x-intercept(s): 735,0
y-intercept(s): 0,490
16, 12, 20,35,21,17,19,20,13,12,15
What is the
O A. 7 OC. 20
OB. 13 OD. 12
interquartile range of the scores?
Interquartile range of the scores is 7.
What is interquartile range?When values are ranked from lowest to highest, the IQR designates the middle 50% of those values. Find the median (middle value) of the bottom half and upper half of the data before calculating the interquartile range (IQR). Quartile 1 (Q1) and Quartile 3 are these values (Q3). The IQR represents the variation between Q3 and Q1. The strongest indicator of variability in data sets with outliers or skewed distributions is the interquartile range. It's unlikely to be impacted by outliers because it's based on numbers that come from the center half of the distribution.
Given Set
16, 12, 20,35,21,17,19,20,13,12,15
12, 12, 13, 15, 16, 17, 19, 20, 20, 21, 35
25 percentile(Q₁) = 13
50 percentile(Q₂) = 17
75 percentile(Q₃) = 20
Interquartile range = Q₃ - Q₁
Interquartile range = 20-13
Interquartile range = 7
Interquartile range of the scores is 7.
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Can some on help me on these please and thank you!
Give two real-world situations that could be represented by the value -2
We have to represent two real world situations that could be represented by the value -2.
(1) Let there be a fish which is 2 meter below the sea level.
Considering the sea level point to be zero and denoting the points above sea level as positive and the points below sea level as negative, like we do in a cartesian plane, the point which is 2 meter below the ground level will be -2.
(2) Let there be a box buried 2 feet under the ground.
Considering the ground level to be zero and denoting the point above the ground level as positive and the points below ground level as negative, the point which is 2 meter below the ground level will be -2.
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The following data shows the number of contacts that a sample of high school students had in their cell phones. 154,109,137,115,152,140,154,178,80,103,126,126,137,165,165,129,200,148A.) Identify any outliers in the dataB.) Draw a box plot to represent the dataC.) Analyze your data
Given set :
154,109,137,115,152,140,154,178,80,103,126,126,137,165,165,129,200,148.
Rewrite the given data set from least to highest values.
80, 103, 109, 115, 126, 126, 129, 137, 137, 140, 148, 152, 154, 154, 165, 165, 178, 200.
Recall that a data point is an outlier if it is over 1.5 times the IQR below the first quartile or 1.5 times the IQR above the third quartile.
We know that
[tex]\text{IQR}=Q_3-Q_1[/tex][tex]Q_3=The\text{ third quartile = The median of the upper half of the data set.}[/tex][tex]Q_1=The\text{ first quartile = The median of the lower half of the data set.}[/tex]The upper half of the data set is
{137, 140, 148, 152, 154, 154, 165, 165, 178, 200}
The number of data in the set is even.
There are two middle terms in this upper half of the given set. That are 154 and 154.
[tex]Q_3=\frac{154+154}{2}=154[/tex]The lower half of the data set is
{80, 103, 109, 115, 126, 126, 129, 137, 137, 140}
The number of data in the set is even.
There are two middle terms in this lower half of the given set. Which are 126 and 126.
[tex]Q_1=\frac{126+126}{2}=126[/tex]Substitute known values in the IQR formula.
[tex]\text{IQR}=154-126=28[/tex]We get IQR=28.
[tex]\text{HIgher outlier }\ge Q_3+(1.5\times IQR)[/tex][tex]undefined[/tex]What is the slope of the line passing through (5, 0) and (2, 0)
A) 2/5
B) 0
C) 5/2
D) Undefined
the model of the skateboard you want to buy is available in 9 different colors and 3 different styles. in how many ways can you order the board?
Multiply the number of colors by the number of styles
9 x 3 =27 ways
Question 3
Write an addition problem that has a sum of -3/ 2/3
The answer is -3 2/3 + 1 = -2 3/5
It's a linear equation form -3/ 2/3
What is linear equation?
An equation between two variables that, when plotted on a graph, produces a straight line or say first degree equation is known as linear equation.
An addition problem that has a sum of -3 2/3 may take different forms one of which is the answer supplied where; -3 2/3 is added to 1 and the result is -2 3/5
Therefore, the answer of -3 2/3 is -2 3/5
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Write a math problem that this expression could be used to represent. Create a visual fraction model to represent the situation. Record the equation with the product. 9x6
Please, give me some minutes to take over your question
Ben run 6 miles in an hour. How many miles does Ben run in nine hours?
Ratio
6 miles / 1 hour
6 miles/ 1 hour = x miles / 9 hours
x= 6 * 9 = 54 miles
Ben runs 54 miles in 9 hours.
the following group of equations represents which type of system {x^2 + y^2 = 9 x^2/16 + y^2/9 =1
The given group of equations represents a system of non-linear equations.
How to know if an equation is linear or nonlinear?A mathematical equation must take the form y = m x +b in order to be classified as a linear function (in which m is the slope and b is the y-intercept). This form cannot be satisfied by a nonlinear function.
Only first degree variables and terms that contain the products of variables are present in a linear equation.
However, in the case of nonlinear equations, either the equation comprises a product of variables or at least one of the variables is not of the first degree.
If the graph of an equation is a straight line, the equation is linear. Otherwise, if the power of x is more than one, then it is nonlinear.
The given equations has the degree more than 1 and their graph is also not a straight line.
Hence, the given group of equations represents a system of non-linear equations.
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complete it for me please urgent
Answer:
8. y=3x+2
9. y=2x-6
10. y=1/2x+3
14. y=-2x
all i know hope this helps
The graph of F(x), shown below, resembles the graph of G(x) = x², but it hasbeen changed somewhat. Which of the following could be the equation ofF(x)?OA Fx)=0.3x²+2 OB. F(x)=3x2+2OC. F(x) = -x²2² +2D. F(x)=x²+2
Answer:
Explanation:
Given the function:
[tex]G(x)=x^2[/tex]The graph of G(x) is wider than the graph of F(x), so we can conclude that G(x) has been stretched vertically by a factor greater than 1 to obtain F(x).
Furthermore, G(x) was translated upwards by 2 units when we compare the vertices.
Thus, from the options,a possible equation for F(x) is:
[tex][/tex]Answer:F(x)=3x^2+2
Step-by-step explanation:
Find the quotient and remainder for the following expression using the division algorithm.
33402
The quotient of 33/402 is 0 and the remainder is 369
How to determine the quotient?
The division expression is given as
33/402
From the above expression, we have
Numerator = 33
Denominator = 402
As a general rule of quotient, when the denominator is greater than the numeration, then the quotient is 0
How to determine the remainder?The division expression is given as
33/402
From the above expression, we have
Numerator = 33
Denominator = 402
As a general rule of quotient, when the denominator is greater than the numeration, then the remainder is 0
Remainder = Denominator - Numerator
This gives
Remainder = 402 - 33
Evaluate
Remainder = 369
This means that the remainder of 33/402 is 369
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Possible question
Find the quotient and remainder for the following expression using the division algorithm.
33/402
3/5 3) Find the equation of the line passing through the points (1, -2) and (-2, 7). Write the equation in slop-intercept from. Oy = 3x - 5 Oy= 3x + 13 Oy=-3x + 1 Oy=-3x - 2 Previous Next Submit arch O
hello
to solve this question we would first of all find the slope of the line
[tex]\begin{gathered} slope(m)=\frac{y_2-y_1}{x_2-x_1} \\ \end{gathered}[/tex][tex]\begin{gathered} y_1=-2 \\ x_1=1 \\ y_2=7 \\ x_2=-2 \end{gathered}[/tex]we can now substitute this into the equation
[tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ m=\frac{7-(-2)}{-2-1} \\ m=\frac{7+2}{-3}=\frac{9}{-3}=-3 \end{gathered}[/tex]the slope of the line is -3
we can write out how the equation looks
[tex]\begin{gathered} y=mx+b \\ y=-3x+b \\ b=\text{intercept} \end{gathered}[/tex]we can use one of the points to solve for b
[tex]\begin{gathered} y=-3x+b \\ u\sin g\text{ the first point} \\ (1,-2) \\ -2=-3(1)+b \\ -2=-3+b \\ b=3-2 \\ b=1 \end{gathered}[/tex]we can now rewrite our equation with slope and intercept
[tex]\begin{gathered} y=mx+b \\ y=-3x+1 \end{gathered}[/tex]from the calculation above, the equation of the line is given as y = -3x + 1
A random sample of 269 student were asked what kind of vehicle they prefer a car truck the following contingency table gives the 2 way classification of the responses
Given a random sample of 269 students and a contigency table that gives the 2 way classification of their responses.
The probability formula is:
[tex]P(E)=\frac{n(\text{Required outcome)}}{n(\text{Possible outcome)}}[/tex][tex]P(\text{Female)}=\frac{(99+22)}{269}=\frac{121}{269}=0.450[/tex][tex]P(\text{Car)}=\frac{(87+99)}{269}=\frac{186}{269}=0.691[/tex][tex]\begin{gathered} P(\text{Female}|\text{Truck)}=\frac{P(\text{Female }\cap\text{ Truck)}}{P(\text{Truck)}} \\ =\frac{22}{(61+22)}=\frac{22}{83}=0.265 \end{gathered}[/tex][tex]P(\text{Truck }\cap\text{ Female)=}\frac{22}{(99+22)}=\frac{22}{121}=0.182[/tex]The conditional probability P(A/B) or P(B/A) arises only in the case of dependent events.
Dose anyone get this i am confused
Answers:
a) 32500
b) 0.00604
c) 2.4 * 10^6
d) 1.47 * 10^(-3)
===================================================
Explanation:
The exponent over the 10 tells us how many spaces to move right or left. If the exponent is positive, we move right. If negative, we move left. Think of a number line.
For part (a), the exponent is 4. So we move the decimal point 4 spaces to the right.
The 3.25 then becomes 32500
--------------
In part (b), the exponent -3 means we move 3 spots to the left to go from 6.04 to 0.00604
---------------
Part (c)
Place the decimal point between the first two digits and erase the zeros to get 2.4
Then we need to move the decimal point 6 spots to the right to get back to 2,400,000 again
Therefore we can say 2,400,000 = 2.4*10^6
---------------
Part (d)
Place the decimal point just after the first nonzero digit, and erase the zeros to the left to get 1.47
We must move the decimal point 3 spots to the left to go from 1.47 back to 0.00147 again
It means 0.00147 = 1.47*10^(-3)
Answer: he is right
Step-by-step explanation:
Use congruent triangles to find side lengths.If you were asked to draw the two congruent triangles described below, what would be each side length? ABC≈ EFGAB = 6, GF = 8, AC = 10.
ANSWER
• AB and EF
,• BC and FG
,• AC and EG
EXPLANATION
The order in which the vertices of the triangles are named gives us which sides are congruent. If ΔABC ≅ ΔEFG, then the pairs of corresponding congruent sides are,
[tex]\begin{gathered} AB\cong EF \\ BC\cong FG \\ AC\cong EG \end{gathered}[/tex]How many times greater is the value of 4,563 than the value of 4.563?
The given number 4,563 is 4558.437 times greater than 4.563.
What is decimal?
Decimals are numbers that have two components, a whole number component and a fractional component, which are separated by a decimal point. 12.5 is a decimal number, for instance.
Using a single notation, decimals can convey both the entire number and the fraction. Whole numbers and fractions are separated from each other in decimals by a point called a decimal point. For instance, in the number 65.4, the entire number is 65, while the fractional half is 4 (10).
The given numbers are 4,563 that is four thousand five hundred sixty- three and 4.563 that is four point five six three.
The difference between these two numbers is 4558.437.
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Which would be used to solve this equation? Check all that apply.
StartFraction p Over 3 EndFraction = 12
The steps that would be applied to solve the equation are:
multiplying both sides of the equation by 3
substituting 36 for p to check the solution
What are the steps to take to solve the equation?An equation is a statement in mathematics that consists of two or more expressions that are connected by an equal to sign.
The given equation is:
p / 3 = 12
In order to solve, the equation, p has to be made the subject of the formula.
In order to make the subject of the formula, take the following step:
Multiply both sides of the equation by the denominator of p. The denominator of p is 3.
3 x (p/3) = (12 x 3)
p = 36
Substitute for p using 36 to check the accuracy of the answer derived
36 / 3 =12
Here are the options:
subtracting 3 from both sides of the equation
multiplying both sides of the equation by 3
dividing both sides of the equation by 3
substituting 4 for p to check the solution
substituting 36 for p to check the solution
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