Answer:
-4x-12
Step-by-step explanation:
7x-8x-3x = -4x
14-26 = -12
-4x-12
URGENT!! ILL GIVE BRAINLIEST!!!! AND 100 POINTS!!!
cylinder
A cylinder is a three-dimensional solid figure with two identical circular bases connected by a curved surface at a specified distance from the center, which is the height of the cylinder. Toilet paper wicks and cold drink cans are examples of cylinders.
A cone is a three-dimensional shape that smoothly narrows from a flat base (usually a circular base) to a point called the vertex or apex that forms the axis to the center of the base. A cone can also be defined as a pyramid with a circular cross-section instead of a cone with a triangular cross-section. These cones are also known as circular cones.
The cylinder and cone have the same radius because they both have the same base area.
The volumes of the cylinder and the cone are equal,
Cylinder Volume = Cone Volume
; Ûr2h=1/3 Ûr2h
(5×5)= 1/3×5×h
h=12
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One month Trey rented three movies and five video games for a total of $35. The next month he rented six movies and two video games for a total of $20. Find the rental cost for each movie and each video game.
The rental cost for each movie and each video game is 2.25.
One month Trey rented three movies and five video games for a total of 35.
3 M + 5V = 33
6 M + 2 V = 24
Divides bottom equation by 2:
3 M + 5 V = 35
3 M + V = 20
subtracts:
4V = 21
V = 21/4 = $5.25
3 M + 5.25 = 12
3 M = 6.75
M = 2.25
Let x = cost to rent a movie and y = cost to rent a video game
3x + 5y = 33
6x + 2y = 24
Multiply the first equation by -2:
-6x - 10y = -66
6x + 2y = 24
Add the equations to get -8y = -42
So, y = 5.25 and x = 2.25.
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A bacteria culture contains 2000 bacteria and doubles every half hour, find the size of the bacterial population after 5 hours
A C=26
9 units
1.8 units
The value of X is 9 units it is solved by using the properties of Similar Triangles
What are Similar Triangles?
Two objects are comparable in Euclidean geometry if they have the same form or one has the same shape as the mirror image of the other. More exactly, one can be created by evenly scaling the other, potentially with extra translation, rotation, and reflection.
Solution:
In the given question
Triangle ABC and Triangle DEC are similar by AAA property
By using the properties of Similar Triangle
We can say that AC/DC = BC/EC
26/8 = (x+4)/4
13 = x + 4
x = 9 units
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Consider a circle whose equation is x2 + y2 – 2x – 8 = 0. Which statements are true? Select three options. The radius of the circle is 3 units. The center of the circle lies on the x-axis. The center of the circle lies on the y-axis. The standard form of the equation is (x – 1)² + y² = 3. The radius of this circle is the same as the radius of the circle whose equation is x² + y² = 9.
The center of the circle lies on the x-axis. The radius of the circle is 3 units. The radius of this circle is the same as the radius of the circle whose equation is x² + y² is 9.
What is radius of a circle?The radius of a circle is the distance between the circle's centre and any point on its circumference. It is usually represented by the letters 'R' or 'r'. This number is significant in almost all circle-related formulas. A circle's area and circumference are also measured in terms of radius.
The standard equation of a circle is expressed as:
x² + y²+2gx+2fy+C=0
Centre is (-g, -f)
radius = √g²+f²-C
Given a circle whose equation is 2+ y²-2x-8=0.
Get the centre of the circle
2gx = -2x
2g=-2
g=-1
Similarly, 2fy = 0
f=0
Centre = (-(-1), 0) = (1, 0)
This shows that the center of the circle lies on the x-axis
r = radius = √g²+f²-C
radius = √1²+02-(-8)
radius =√9 = 3 units
The radius of the circle is 3 units.
For the circle x² + y² = 9, the radius is expressed as:
r² = 9
r = 3 units
Hence the radius of this circle is the same as the radius of the circle whose equation is x² + y² = 9.
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Use the results from a survey of a simple random sample of 1055 adults. Among the 1055 respondents, 77% rated themselves as above average drivers. We want to test the claim that 7/10 of adults rate themselves as above average drivers. Complete parts (a) through (c).
The p-value of the test is 0, which is less than the standard significance level of 0.05, thus we can conclude that the proportion respondents who rated themselves as above average drivers is greater than 0.7.
What is simple random sample?We may test the following using the example data:
In reality, 812.35 respondents identified as better drivers than average.
We can infer that the proportion of respondents who rated themselves as above average drivers is greater than 0.7 because the test's p-value is 0, which is less than the standard significance level of 0.05. 77% of the sample of 1055 adults rated themselves as above average drivers, so 0.77(1055) = 812.35.
As a result, 812.35 respondents actually assessed themselves as better drivers than average.
We examine if the proportion is 7/10=0.7 at the null hypothesis.
H0 is that, with p = 0.7.
If the proportion is larger than 70%, we test for the alternative hypothesis, which is H1:p>=0.7.
The test statistic comes from:
The parameters for this issue are p dash = 0.77, p = 0.7, and n = 1055.
As a result, the test statistic's value is:
z = 351.758 root
The likelihood of discovering a sample proportion above 0.77, calculated as 1 minus the p-value of z = root of 351.758, is the test's p-value.
According to the z-table, the p-value for z = root of 351.758 is 1, and 1 - 1 equals 0.
Since the test's p-value is zero and is below the conventional significance level of 0.05, we can infer that a higher proportion of respondents than 0.7 evaluated themselves as above-average drivers.
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a rectangle is 19 feet long and 3 feet wide find the area
The area of a rectangle is given as:
Area = Length x width
The area of the rectangle is 57 square feet.
What is a rectangle?A rectangle is a two-dimensional shape where the length and width are different.
The area of a rectangle is given as:
Area = Length x width
We have,
Length = 19 feet
Width = 3 feet
The area of the rectangle.
= 19 x 3
= 57 square feet.
Thus,
The area of the rectangle is 57 square feet.
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Calculate the dosage (in mg/min) to the nearest tenth using the calculations method, ratio and proportion or dimensional analysis, that you choose. (Simplify your answers completely.)
An infusion of 4 g in 500 mL is ordered at 60 mL/hr.
The required value of dosage in mg/min is given as 8 mg/min.
What is the application ratio and proportion?A ratio is the relation between two numbers as a / b. A proportion is the equality of two ratios as a / b = c / d.
Ratio and proportion can be applied to solve Mathematical problems dealing with unit values of the quantities.
Given that,
The dose administered per hour is 60 mL/hr.
And, the infusion is given as 4g for 500 mL.
In order to calculate the dosage in mg/min, ratio and proportion method can be used as follows,
The 500 mL is for 4g.
Then for 1 mL, there is 4/500 g.
Thus, for 60 mL, there is 4/500 × 60 g.
Since 1 g = 1000 mg.
The above expression can be written as,
4/500 × 60 × 1000 mg = 480 mg
Now, the dosage can be calculated as,
480 mg/hr
= 480/60 mg/min
= 8 mg/min
Hence, the dosage in milligram per minutes is given as 8 mg/min.
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Critique each of the following proposed research plans. Your critique should explain any problems with the proposed research and describe how the research plan might be improved. Include a discussion of any additional data that need to be collected and the appropriate statistical techniques for analyzing the data.
(a) A researcher is interested in determining whether a large firm is guilty of gender bias in setting wages. To determine potential bias, the researcher collects salary and gender information for all of the firm’s employees. The researcher then plans to conduct a "difference in means" test to determine whether the average salary for women is significantly different from the average salary for men.
(b) A researcher is interested in determining whether time spent in prison has a permanent effect on a person’s wage rate. He collects data on a random sample of people who have been out of prison for at least fifteen years. He collects similar data on a random sample of people who have never served time in prison. The data set includes information on each person’s current wage, education, age, ethnicity, gender, tenure (time in current job), and occupation, as well as whether the person was ever incarcerated. The researcher plans to estimate the effect of incarceration on wages by regressing wages on an indicator variable for incarceration, including in the regression the other potential determinants of wages (education, tenure, and so on).
The information provided indicates that the means test is too narrow because it excludes factors like the type of engineer, amount of education, and experience. The type of engineer or educational level may be a reflection of the gender with lower earnings.
Additional information on the factors, including gender, education, and the type of engineer, could enhance the research.
Then, it is advised to build a multiple regression where the wage is the dependent variable and the other four variables are independent variables. The "difference in means" test is not appropriate for identifying gender bias in salary setting due to the significance of the omitted variable.
The variables which are likely useful to add to the regression to control for important omitted variables are excessive drug or alcohol use and their gang activity.
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A piece of rope is 24 1/2 feet long. How many 1/4- foot sections can be cut from it?
NEED HELP ASAP!!
=============================================
Explanation:
1/4 = 0.25
1/2 = 0.5
24 & 1/2 = 24.5
The rope is 24.5 ft long and you want sections of length 0.25 ft each.
Let x be the number of sections we can make.
1 section is 0.25 ft long
x of them combine to 0.25x feet long
Set this equal to 24.5 and solve for x
0.25x = 24.5
x = (24.5)/(0.25)
x = 98
There will be 98 sections of equal length (each being 0.25 ft)
------------------
Another way to look at it:
1 foot of rope gets you four sections of 0.25 ft each
24 feet of rope gets you 24*4 = 96 sections.
Another 0.5 ft adds another 0.5*4 = 2 sections to get to a total of 96+2 = 98
Jason bought two different types of boards to make picture frames. He bought a red cedar board and will cut it into eight 10.25-inch pieces. He also bought a tiger maple board that he will cut into sixteen 10.5-inch pieces. Determine the difference between the boards’ total lengths.
The difference between the boards’ total lengths is 86 inches.
What is a numerical expression?A numerical expression is a mathematical statement written in the form of numbers and unknown variables. We can form numerical expressions from statements.
The difference between the total lengths of the boards is the positive value when we subtract one from another.
The total length of the red cedar board is = (8×10.25) = 82 inches.
The total length of the tiger maple board is = (16×10.5) = 168 inches.
∴ The difference is (168 - 82) = 86 inches.
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An election ballot asks voters to select two city commissioners from a
group of eight candidates. In how many ways can this be done?
Answer:
The answer is 4
Step-by-step explanation:
The group candidate is 8
with a division between the number of candidates and the number of selection will the result.
8 candidates ÷ 2 candidates = 4
The way in which 2 candidates can be selected from the pool of 8 candidates to be a city commissioner is 4.
In one tailed T-test, if the test statistics ist and to is the t-value under null hypothesis, then p-value = Prít > to alternate hypothesis is true) if ty > O and p-value = Pr(t < to alternate hypothesis is true) if to < 0. O True O False U
In a one-tailed T-test, if the test statistics and the t-value are under the null hypothesis, then p-value = ρ > to alternate hypothesis is true.
Critical zones in hypothesis testing are ranges of distributions where the values correspond to outcomes that are statistically significant. Analysts set the significance level (alpha) and whether the test is one-tailed or two-tailed in order to determine the size and location of the key regions.
The likelihood of rejecting an accurate null hypothesis is the significance level.
A test statistic's sample distribution assumes that the null hypothesis is true.
As a result, you need to shade the necessary fraction of the distribution to depict the crucial areas on the distribution for a test statistic. You shade 5% of the distribution using the typical significance threshold of 0.05.
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I cannot figure out this problem
a) The Test statistic of the hypothesis is; 0.81
b) The p-value from the test statistic is; 0.20897.
c) The final conclusion is that there is not sufficient evidence to reject the null hypothesis that (p1 - p2) = 0
How to find the test statistic?Test statistic is defined as a number, calculated from a statistical test, used to find if your data could have occurred under the null hypothesis. In this case, we are dealing with proportions and as such the test statistic has the formula;
z = (p1 - p2)/standard error
p1 = 53/90 = 0.59; s1 = √(0.59 * 0.41/90) = 0.052
p2 = 48/90 = 0.53; s2 = √(0.53 * 0.47/90) = 0.053
Hence, for the distribution of differences, the mean and the standard error are given as follows:
Mean: p = 0.59 - 0.53 = 0.06
Standard error: s = √(0.052² + 0.053²) = 0.074
a) Test statistic = p/s = 0.06/0.074
Test statistic = 0.81
b) From p-value from z-score calculator, we get that;
p-value = 0.20897.
c) The p-value is greater than the significance value of 0.05, we fail to reject the null hypothesis and conclude that there is not suffucuent evidence to reject the null hypothesis that (p1 - p2) = 0
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In class of students, the following data table summarizes how many students play and instrument or a sport. What is the probability that a student who plays a sport also plays an instrument?
A student selected at random from the class has a 0.5 is 50% chance of not participating in sports, according to the probability notion.
What is the probability?A probability is calculated by dividing the entire number of possible outcomes by the desired outcomes.
In this issue:
The total number of students is 30 (8 + 7 + 3 + 12).
3 + 12 = 15 of the total don't participate in sports.
Hence:
p =D/T = 15/30 = 0.5
There is a 50% chance that a student who was randomly selected from the class does not participate in sports.
A student selected at random from the class has a 0.5 is 50% chance of not participating in sports, according to the probability notion.
The complete question is :in a class of students, the following data table summarizes how many students playing instrument or a sport. What is the probability that student plays an instrument given that they play a sport?
play an instrument and a sport: 3
play an instrument but does not play a sport: 8
does not play an instrument but plays a sport: 7
does not play an instrument or a sport: 12
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what is the first significant figure in the number 0.00892?
Answer:
0.009
Step-by-step explanation:
0.00892
first significant figure will be
0.00900
or = 0.009
i hope this helps
Answer:
0.009
Step-by-step explanation:
0.00892(a significant figure is a number greater than zero)
so the first number after zero is 8
the next number is 9, so round 9 up and it becomes 1.
Add 1 to 8 to give you 9
=0.00900 or 0.009
Hope it helped you
Solve the systems of equations graphed on the coordinate axes below.
The solution of the system of equation y = -x + 3 and y = 3x + 7 will be (-1,4).
What is the equation?The definition of an equation in algebra is a mathematical statement that demonstrates the equality of 2 mathematical expressions.
More than one variable may be present inside a linear equation. An equation is said to be linear if the maximum power of the variable is consistently unity.
As per the given system of equations,
y = -x + 3 and y = 3x + 7
Compare both,
3x + 7 = -x + 3
3x + x = 3 - 7
x = -1
y = -(-1) + 3 = 4
So the solution will be (-1,4).
Hence "The system of equations y = -x + 3 and y = 3x + 7 will have the following solution: (-1,4).".
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$2, 900 is invested in an account earning 6.1% interest (APR), compounded quarterly. Write a function showing the value of the account after t years, where the annual growth rate can be found from a constant in the function. Round all coefficients in the function to four decimal places. Also, determine the percentage of growth per year (APY), to the nearest hundredth of a percent.
A function showing the value of the account after t years, where the annual growth rate can be found from a constant in the function is f(t) = 2900 × (1.0624)^t and APY is 6.24%.
What is Compound Interest?Compound interest in simple words is the interest earning for your savings with the interest which those savings earn.
The formula for calculating the amount in Compound Interest is,
A = P( 1 + [tex]\frac{r}{n}[/tex] )ⁿᵇ
where A is the amount, P is the principal, r is the rate of interest, n is the number of times interest compounded in a year and b is the number of years.
Here, P = $2900, r = 6.1% = 0.061, n = 4 (quarterly) and b = t years
A = 2900 (1 + [tex]\frac{0.061}{4}[/tex])^4t
A = 2900 (1.0153)^4t
A = 2900 × (1.0624)^t
So A can be said as a function of t.
f(t) = 2900 × (1.0624)^t
Percentage of growth per year (APY) = ( 1 + [tex]\frac{r}{n}[/tex] )ⁿ - 1
= (1 + [tex]\frac{0.061}{4}[/tex])⁴ - 1
= 1.0624 - 1
= 0.0624 = 6.24%
Hence the function of the value of the account after t years is f(t) = 2900 × (1.0624)^t, where the value 1.0624 is a constant.
Percentage of growth per year is 6.24%.
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11/x = 13/17 round answer to the nearest tenth
Answer:
To solve this equation, you can use cross multiplication to eliminate the fractional terms. Doing so gives you 11 * 17 = 13 * x. Solving for x gives you x = (11 * 17)/13. Dividing these two numbers gives you approximately x = 8.46. Rounding this number to the nearest tenth gives you x = 8.5. Therefore, the value of x that makes the equation true is approximately 8.5.
Find the sum.
(4x² + x − 4) + (2x² + 4x + 5) =
20 POINTS PEASE
Answer:
6x² + 5x + 1
Step-by-step explanation:
(4x² + x − 4) + (2x² + 4x + 5)
1. Expand the brackets to get
4x² + x − 4 + 2x² + 4x + 5
2. Group common terms (terms with same power as well as the constant)
4x² + 2x² + x + 4x - 4 + 5
3. Simplify
4x² + 2x² = 6x²
x + 4x = 5x
-4 + 5 = 1
4. Solution is
6x² + 5x + 1
If a number is added to its reciprocal, the result is 5/2. Find the numbers
According to the question
Let the number be x
[tex]x+\frac{1}{x}=\frac{5}{2} \\\\\ \frac{x^{2}+1}{x} = \frac{5}{2} \\\\\\\ By \\ cross-multiplication \\\\x^{2}+1 = \frac{5}{2} * x\\\\2x^{2}+2 = 5x\\\\2x^{2}-5x+2 = 0\\\2x^2-4x-1x+2 = 0\\2x(x-2)-(x-2)=0\\(2x-1)(x-2)=0\\\\therefore,\\\\x = \frac{1}{2}\\or\\x = 2[/tex]
What is the value of x?
Please help me
Answer:
x = 35
Important things to know:
1. A + (x + 110) will equal 180 degrees
2. The interior angles of a triangle will equal 180 degrees.
With these two pieces of knowledge, you can substitute the value of A as "180 - (x+110)" because A = 180-(x+110)
Step-by-step explanation:
Find the point of intersection for the pair of linear equations.
x+y= -8.5
y = 2x + 4.4
A. (-4.3, -4.2)
B. (-4.1, 4.4)
C. (1.9, -3.7)
D. (-3.1, 2.4)
A stone is dropped from the edge of a roof, and hits the ground with a velocity of −165 feet per second. Assume the acceleration due to gravity is -32 feet per second squared. How high (in feet) is the roof?
Answer:
425.39 ft
Step-by-step explanation:
[tex]\frac{1}{2}mv^2=mgh\\\frac{1}{2}v^2=gh\\v^2=2gh[/tex]
h = [tex]\frac{v^2}{2g} = \frac{165^2}{2 * 32}=\frac{27225}{64}=425.39ft[/tex]
A friend lends you $520, which you agree to repay with 8% interest. How much will you have to repay?
Answer:
Total interest paid:$112.65
Total payments:$632.65
Step-by-step explanation:
What strategy will you use to find the constant of proportionality
After writing y = kx, we'll solve for k putting the given corresponding values of x and y.
What are ratio and proportion?A ratio is a comparison between two similar quantities in simplest form.
Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.
In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.
Suppose we have two variables x and y and they are directly proportional and some values of x and y are given.
If we see that y has a bigger corresponding value than x, we'll write
y = kx,
In the case of inverse variation, we write y = k/x.
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Simplify
A. 8a5
B. 8a6
C. 16a5
D. 16a6
help
Samantha is going to invest in an account paying an interest rate of 6.4%
compounded monthly. How much would Samantha need to invest, to the nearest
dollar, for the value of the account to reach $2,130 in 12 years?
Based on the given parameters, the value of the money to invest initially is $994.8
How to determine the amount of investment?The given parameters about the compound interest are
Principal Amount, P = $2130
Interest Rate, R = 6.4%
Time, t = 12
Number of times, n = 12 i.e. monthly
To calculate the amount, we have:
A = P + CI
Where
C = P(1 + R)^t
So, we have
A = P(1 + R)^t
This can be rewritten as
A = P(1 + R/n)^nt
Substitute the known values in the above equation
2130 = A * (1 + 6.4%/12)^(12*12)
So, we have
A = 2130/[(1 + 6.4%/12)^(12*12)]
Evaluate the expression
A = 994.8
Hence, the amount of the investment is $994.8
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what is 2 x 2 x 2 using an exponent, in cubic units , then evaluate
Answer:
2^3 = 8
Step-by-step explanation:
Romney bought a car with $6000 down payment, and paid the remaining cost by installments, which totaled $15000. Romney then sold the car after 10 years for $5500. How much did driving this car cost Romney per year?
Hence, the driving second car cost Romney per year pays is $ [tex]16364[/tex].
What is the selling price?
The selling price of a product or service is the seller’s final price, i.e., how much the customer pays for something. The exchange can be for a product or service in a certain quantity, weight, or measure.
Here given that,
Romney bought a car with $[tex]6000[/tex] down payment, and paid the remaining cost by installments, which totaled $[tex]15000[/tex]. Romney then sold the car after [tex]10[/tex] years for $[tex]5500[/tex].
So, he sold his car in $[tex]15000(6000)=90000000[/tex].
And he is paying installment in every month which is $ [tex]15000[/tex].
So, in case of second car he paied $ [tex]5500[/tex] and his installments of every month would be
[tex]\frac{90000000}{5500}=16364[/tex] $
Hence, the driving second car cost Romney per year pays is $ [tex]16364[/tex].
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