Answer:
50
Step-by-step explanation:
Select the best answer.
1. A principal spent $1780 on c calculators
for her school. Write an expression that
shows the cost of one calculator?
Find the mean, variance and standard deviation of the binomial experiment. In a recent survey, 70% of the community favored building a police substation in their neighborhood. If 30 citizens are chosen, what is the mean number favoring the substation? What would be the variance and standard deviation of their responses?
Answer: Mean = 21 , Variance = 6.3 , standard deviation =2.51
Step-by-step explanation:
Formula for the mean, variance and standard deviation of the binomial experiment :
[tex]Mean = np\\\\ Variance = np(1-p)\\\\ Standard\ deviation = \sqrt{variance}[/tex]
, where n= sample size , p= population proportion.
As per given, p= 70%=0.7 , n=30
[tex]Mean = 0.7\times30=21\\\\Variance =(30)(0.7)(1-0.7)=(21)(0.30)=6.3\\\\ Standard\ deviation = \sqrt{6.3}\approx2.51[/tex]
Hence, Mean = 21 , Variance = 6.3 , standard deviation =2.51
Why is the percent increase from 45 to 75 not equal to the percent decrease from 75 to 45? Select three options. The amount of change is different for the percent increase and the percent decrease. The ratio of the percent increase is not the same as the percent decrease. The ratio for the percent increase has a smaller denominator than the percent decrease. The ratio for the percent increase has a different numerator than the percent decrease. The original amount for the percent increase is different from the original amount for the percent decrease.
Answer:
A, C, D
Step-by-step explanation:
I took the test lol :)
(A) The amount of change is different for the percent increase and the percent decrease.
(C) The ratio for the percent increase has a smaller denominator than the percent decrease.
(D) The ratio for the percent increase has a different numerator than the percent decrease.
Percentage:A value or ratio that may be stated as a fraction of 100 is referred to as a percentage in mathematics. If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100. The proportion, therefore, refers to a component per hundred. Per 100 is what the word percent means.Example -An increase of $[tex]0.15[/tex] on a $[tex]2.50[/tex] price equals a fractional increase of [tex]\frac{0.15}{2.50} =0.06[/tex]. This represents an increase of % when expressed as a percentage.There is no mathematical restriction, therefore percentages may have various values even though the majority of % numbers fall between [tex]0[/tex] and [tex]100[/tex]. For percent changes and comparisons, it's typical to use terms like [tex]111[/tex] percent or [tex]35[/tex] percent.Therefore, the correct options are as follows -
(A) The amount of change is different for the percent increase and the percent decrease.
(C) The ratio for the percent increase has a smaller denominator than the percent decrease.
(D) The ratio for the percent increase has a different numerator than the percent decrease.
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Part A
The graph shows the volume of water in a sink, x minutes after the faucet is turned on.
What is the slope of the line?
Slope =
Part B
Connor says that the graph shows that water is flowing at a rate of 2 gallons per minute. Is he correct?
a. Connor is correct because the rate of water flowing is equal to the slope. Water is flowing in at a rate which is about 2 gallons per minute.
b. Connor is not correct because the rate of water flowing is greater than the slope. Water is flowing in at a rate which is slower than 2 gallons per minute.
c. Connor is not correct because the rate of water flowing is not equal to the slope. Water is flowing in at a rate which is slower than 2 gallons per minute.
d. Connor is correct because the rate of water flowing is less than the slope. Water is flowing in at a rate which is faster than 2 gallons per minute.
Answer:
Part A: ½
Part B: c. Connor is not correct because the rate of water flowing is not equal to the slope. Water is flowing in at a rate which is slower than 2 gallons per minute.
Step-by-step explanation:
Part A:
Slope of the proportional graph = y/x
Using the point on the line, (4, 2),
Slope = 2/4 = ½.
Part B:
Since the slope of the graph bus ½, it shows that the water is flowing at a rate of ½ gallon per minute. Therefore, Connor is NOT CORRECT.
The rate of water Connor stated does not correspond with the rate shown by the slope. The slope of the graph, ½, shows that the water is flowing at a much slower rate than at the rate of 2 gallons per minute, which Connor stated.
The right answer is C.
Determine the
constant of
proportionality.
Answer:
Step-by-step explanation:
Time is 2 miles 110 is 55 miles per hr
5 hrs *55 mph= 275
12*55= 660
Yes it is in proportion.
Keith is saving money for a car. He has saved the same amount each year for the past three years, and records of how much he has at the end of each year in the table below.
What is Keith's unit rate of change of dollars with respect to time; that is; how much does Keith save in one year?
the unit rate is blank dollar per year.
Answer:
keith saves 1500 dollars per year
HELP RN PLEASE!!! Jesse has a total of $2.90 in quarters and dimes. If Jesse has a total of 17 coins, how many quarters does Jesse have?
Answer:
0.09
Step-by-step explanation:
2.90/17= 0.17086....
0.17086.../2=9
Pleas help me with this I hate math
Answer:
Not a function, as it fails the vertical line test.
Step-by-step explanation:
I dislike math as well.
Answer:
B. not a function
Step-by-step explanation:
One x value has more than one specific y value. To be a function one x value cannot have more than one specific y value.
Can u help me with this please
Answer:
1. turkey trolley
2. pumpkin pie
3. family dinner
4. smashed potatoes
5. football
6. wishbones
7. kill the turkey
8. green beans
9. corn you policeman xD
10. black friday
some of the stuff i know but i tried
Step-by-step explanation:
pleaseee help
6x7/8=
5/6x2/5=
square root -100= ___+___i
Answer is 10i
Step-by-step explanation:
The lesser of the two solutions to x(x + 4) = 21 is:
Answer:
Lesser is -7
Step-by-step explanation:
x(x+4) = 21
Distribute
x^2 + 4x = 21
x^2 + 4x - 21 = 0
x^2 + 7x - 3x -21 = 0
(x+7)(x-3) = 0
x=-7, 3
PLS MARK BRAINLIEST
The image of the point (9,-2) under a translation is (10,3). Find the coordinates of
the image of the point (-8, 4) under the same translation.
Answer:
(2,7)
Step-by-step explanation:
move 10 places to the right and 3 up
Which relation is a function
Answer:
Step-by-step explanation:
take your pencil, place it vertical and move it from one side to the other of the graph if it touches the graph in more then 1 point is NOT a function.
only the last one in the right bottom it IS a function
Answer:
number 4
The only one that could be a function is the one on the right that is the lowest.
use
algebra tiles to represent polynomial.
In order for two figures to be considered similar, which of the following MUST be true? (Check all that apply) There is more than one answer.
Corresponding sides are proportional
Corresponding sides are congruent
The shapes are exactly the same in side length and angle measure
Corresponding angles are congruent
Answer:
According to me all the options are correct
Jade takes 5 minutes more than twice as long as Binh to ride to their friend’s house. If Binh takes x minutes to ride to his friend’s house, how long will it take Jade?
Answer:
It will take Jade (2x + 5) minutes
Step-by-step explanation:
Let us find the expression that represents the time Jade will take
∵ Binh takes x minutes to ride to his friend’s house
∴ The time Binh takes = x minutes
∵ 5 more means + 5
∵ Twice means × 2
∵ Jade takes 5 minutes more than twice as long as Binh to ride to their
friend’s house
→ Multiply the time Binh takes by 2 and add the product by 5
∵ Binh takes x minutes
∴ The time Jade takes = 2 × x + 5
∴ The time Jade takes = 2x + 5 minutes
∴ It will take Jade (2x + 5) minutes
help with the question please
Step-by-step explanation:
since all 4 sides are equal in length, the figure is a square.
let the length of the square be lm.
529 = l x l
l = 23m
perimeter = 23 x 4 = 92m
Topic: mensuration
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) William eats at a cafe and the cost of his meal is $31.00. He wants to leave a 15% tip. How much should he leave for the tip
Answer:
4.65 dollars
Step-by-step explanation:
x% of y = [tex]\frac{x}{100}[/tex]×y
= [tex]\frac{15}{100}[/tex]×31
= 0.15 × 31
= 4.65 dollars
∴ William will have to give 4.65 dollars.
The sum for three numbers is 57 the second number is 2x the first the third number is 18 less than the second what is the third number
Step-by-step explanation and answer:
consider the numbers x,y,z
X+y+z=57
2x=y-6
y=10+z
y=2x+6
z=y-10
=2x+6-10
z=2x-4
x+y+z=57
x+2x+6+2x-4=57
5x+2=57
5x=55
x=11
y=27
z=18
Students plan to pay back half the debt now though fundraising, and the rest after the harvest. Write an equation to represent the debt they will repay through fundraising. Use a negative integer to show debt. Use "D" to represent the debt that will be repaid by through fundraising
Answer:
D = [tex]\frac{-d}{-2}[/tex]
Step-by-step explanation:
The amount of money that the students will pay back with the fundraiser (D) would be half of the current debt (d) since debt is represented as a negative but the fundraiser needs to be a positive since it is money gained we would divide by -2
D = [tex]\frac{-d}{-2}[/tex]
This equation shows the debt that will be repaid through the fundraiser which would be exactly half of the current debt.
Which statement about this figure is true?
Answer:
Reflectional symmetry with one line of symmetry
Step-by-step explanation:
You can add a line of symmetry right down the middle that would make the left and right of the figure symmetrical, so it is reflectional with one line of symmetry.
50 points decreased by 26%.
Answer:
The answer is 37
Step-by-step explanation:
The answer is 37 because 50 multiplied by 26% is 13 and 50 minus 13 is 37
Answer:
The answer is 37
Step-by-step explanation:
The answer is 37 because 50 multiplied by 26% is 13 and 50 minus 13 is 37
Which graph shows the line y=35x−3?
Answer:
the last picture
Step-by-step explanation:
the one where the line hits the -3 mark on the y-axis
Answer:
this is how the graph should look
Step-by-step explanation:
What is the slope of the line that passes through the points (5,11) and (14,-10)
Answer:
the picture has the answer on it
Step-by-step explanation:
The slope of the straight line that passes through the points (5,11) and (14,-10) is [tex]\frac{-7}{3}[/tex].
What is a straight line?''A straight line is an endless one-dimensional figure that has no width. A straight line is a combination of endless points joined on both sides of a point.''
Given, two points are (5, 11) and (14, -10).
Let, the line that passes through both these points has a slope = m.
Where, m = [tex]\frac{y_2 - y_{1} }{x_2- x_{1} }[/tex].
Here, (y₂ - y₁) = Change in the value of y.
(x2 - x₁) = Change in the value of y.
Therefore, [tex]\frac{y_2 - y_{1} }{x_2- x_{1} }[/tex] = [tex]\frac{-10 - 11}{14 - 5}[/tex] = [tex]\frac{-21}{9}[/tex] = [tex]\frac{-7}{3}[/tex]
Hence, slope of the straight line is [tex]\frac{-7}{3}[/tex].
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What’s the constant of proportionality of the relationship shown in the graph?
Answer: It's 3
Step-by-step explanation:
Paige works at a department store and has a commission rate of 3 percent. Her sales for the quarter were $4,596. If
she eams $50 per day and she worked 30 days in the quarter, what is the total amount she earned?
O $137.88
o $450.00
O $1,500.00
o $1,637.88
1637.88
Answer:
d
Step-by-step explanation: please mark brainliest
Hi can someone plz help me thank you
a jar contains 10 caramels 5 mints and 15 dark chocolates what is the probability of selecting vs mint expressed as show ur working out
Answer: The probability of selecting a mint 1/6
Step-by-step explanation:
the jar contains 30 different candies
out of the 30, 5 are mints
5/30 = 1/6
Given f(x)=2x-10. Evaluate f =24
Answer:
The answer is 17.
Step-by-step explanation:
Plug 24 in at the end where "f" isAdd 10 to both sides.Divide Both sides by 2Get answer of 17