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Nostrana [21]
3 years ago
11

a train travels 120 miles in 1 1/2 hours. At this rate how many miles will the train travel in 6 hours

Mathematics
2 answers:
Morgarella [4.7K]3 years ago
6 0

Answer:

480 miles

Step-by-step explanation:

120/1.5=80

80*6=480

astraxan [27]3 years ago
3 0

Answer:

480

Step-by-step explanation:

miles      hours

120         1 1/2 hours

240        3 hours

360        4 1/2 hours

480        6 hours

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A recent survey showed that in a sample of 100 elementary school teachers, 15 were single. In a sample of 180 high school teache
trapecia [35]

Answer:

By using hypothesis test at α = 0.01, we cannot conclude that the proportion of high school teachers who were single greater than the proportion of elementary teachers who were single

Step-by-step explanation:

let p1  be the proportion of elementary teachers who were single

let p2 be the proportion of high school teachers who were single

Then, the null and alternative hypotheses are:

H_{0}: p2=p1

H_{a}: p2>p1

We need to calculate the test statistic of the sample proportion for elementary teachers who were single.

It can be calculated as follows:

\frac{p(s)-p}{\sqrt{\frac{p*(1-p)}{N} } } where

  • p(s) is the sample proportion of high school teachers who were single (\frac{36}{180} =0.2)
  • p is the proportion of elementary teachers who were single (\frac{15}{100} =0.15)
  • N is the sample size (180)

Using the numbers, we get

\frac{0.2-0.15}{\sqrt{\frac{0.15*0.85}{180} } } ≈ 1.88

Using z-table, corresponding  P-Value is ≈0.03

Since 0.03>0.01 we fail to reject the null hypothesis. (The result is not significant at α = 0.01)

8 0
3 years ago
The chess club plans to sell water bottles to raise $425. They have $175 already. If they sell water bottles for $8 each, at lea
hammer [34]
If they already have $175, they need $250 more dollars. At $8 a water bottle, they would need to sell at least 32 more bottles.
5 0
3 years ago
Karen has a square rug that covers 76.5^{2} of her living room floor. Which measurement is closest to the side length of thes ru
zloy xaker [14]

Answer:

76.5

Step-by-step explanation:

if the area is 76.5^2, then all you have to do is take the square root, and it is 76.5

3 0
3 years ago
I dont know how to do graphing pls help
yarga [219]

Answer:

Solution: (-1, -1)

Step-by-step explanation:

y=4x+2

y=-4/3x-2

Solve by graphing.

First, you need to plot the y-intercept.

y=4x+<u>2</u>

2 will be your y-intercept.

Next, you plot your slope.

y=<u>4x</u>+2

From your y-intercept, you will go up 4 and right one space, if you run out of space go down 4 and left 1.

Now repeat the same steps for the next one.

y=-4/3x<u>-2</u>

Plot your y-intercept.

y=<u>-4/3x</u>-2

because your slope is negative you will go down 4 and right 3, if you run out of room go up 4 and left 3.

Then draw connecting lines and wherever the lines intersect, that's going to be your solution. In this case, the solution is (-1, -1).

Hope this helps :)

4 0
2 years ago
Read 2 more answers
What is the perimeter of a rectangle with length x+4 and a width of 5x-7
AlladinOne [14]

Answer:

12x-6

Step-by-step explanation:

perimeter= 2l+2w

=2(x+4)+2(5x-7)

=2x+8+10x-14

=12x-6

8 0
2 years ago
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