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Alex17521 [72]
3 years ago
5

Russian needs to save $231 to earn money he plans to wash cars and charge $12 per car right to estimates ration could use to det

ermine how many cars he needs to wash
Mathematics
2 answers:
adelina 88 [10]3 years ago
6 0
The kid would need to wash 20 cars because if you divide 231 by 12 is 19.25 and you cant wash a quarter of a car, so you wash 20 and youll have a little money left (or at least he will)
exis [7]3 years ago
3 0
He would have to wash 20 cars in order to earn enough money.
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A Rasmussen Reports survey of 1,000 US adults found that 42% believe raising the minimum wage will help the economy. Construct a
vitfil [10]

Answer:

(0.3798, 0.4602)

Step-by-step explanation:

Let p be the true proportion of US adults who believe raising the minimum wage will help the economy. A point estimate for p is \hat{p}=0.42 and a good aproximation (because we have a large sample) for the standard deviation of \hat{p} is \sqrt{\hat{p}(1-\hat{p})/n}=\sqrt{0.42(0.58)/1000}=0.0156. Therefore, a 99% confidence interval for p is given by \hat{p}\pm z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}} where \alpha=0.01 and z_{\alpha/2} is the \alpha/2th quantile of the standard normal distribution, so we have, 0.42\pm z_{0.005}0.0156, i.e., 0.42\pm(-2.5758)(0.0156) or equivalently (0.3798, 0.4602).

6 0
2 years ago
Maria’s phone bills were $95, $67, $43, and $115. What was the mean, or average, of her phone bills?
Ghella [55]

Answer:

the mean is $80

Step-by-step explanation:

7 0
2 years ago
. A segment has a midpoint at (2, -7) and an endpoint at (8, -5). What are the coordinates of the other endpoint?
Sliva [168]
Ok, you can refer to the midpoint formula to find the endpoint.  Here goes...


MP=(2,-7) and EP=(8,-5)
Let x represent the missing endpoint.
(8+x)/2=2      NOTE: =2 represents first number of MP and the representation of number 8 is self explanatory.  You have two endpoints but need to identify the other endpoint so you divide by 2.  Then, multiply by two on both sides.
2(8+x)/2 = 2*2
16+x/2=4 do the next step (simplify) on the left side of equation 16x/2=8
Now, subtract 4-8=-4  So, the x coordinated of the missing endpoint is -4.


4 0
3 years ago
Read 2 more answers
The two triangles in the following figure are congruent. What is m< B
balu736 [363]

Answer:

37°

Step-by-step explanation:

Sum of angles in a triangle = 180°

So 96 + 47 = 143

180 - 143 = 37

5 0
2 years ago
What is the percent of decrease from 110 to 77
Charra [1.4K]
If you want to easily find the solution you can use your calculator.
Just divide 77 by 110 and see the result.
77/110 = 0.7 = 7/10 = 70/100 = 70% 
100% - 70% = 30%

Explanation
110*x=77
x=77/110, but the answer is not a percent
So 77/110 = ?/100  => ?=77*100/110=70 => 70%
But since 70% does not represent a percentage decreasement, we need to subtract it from the 100% 
100% - 70% = 30%
8 0
3 years ago
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