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spayn [35]
3 years ago
7

A student ran the 100-m dash in 15.4 s. What was the student’s speed in miles per hour?

Mathematics
2 answers:
Marina CMI [18]3 years ago
5 0

Answer:

Speed of the student was 14.51 miles per hour.

Step-by-step explanation:

A student ran the dash = 100 m

Since 1 meter = 0.000621 miles

Therefore, 100 meter = 100× 0.000621

                                   = 0.0621 miles

He ran the dash in 15.4 seconds

∵ 3600 seconds = 1 hour

∴1 second = \frac{1}{3600} hour

∴ 15.4 seconds = \frac{15.4}{3600} hour

                         = 0.00428 hours

Now we know the formula to calculate the speed

Speed = \frac{\text{Disatance}}{\text{Time}}

           = \frac{0.0621}{0.00428} miles per hour

           = 14.51 miles per hour

Speed of the student was 14.51 miles per hour.

vredina [299]3 years ago
4 0
15.4 seconds = 0.00428 hours and 100 meters = 0.062 miles soo the student ran approximately 14.5 mph
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Articles of clothing that the store received last Thursday is 84

<u>Solution:</u>

Given that  

A clothing donation store received numerous articles of clothing on Thursday of last week.

The number of articles of clothing that the store received last Thursday is represented by the following expression:

4 (3x − 1) − 2 (6 + 2x)

Need to calculate articles of clothing that the store received last Thursday when x = 12.5

As on Thursday x = 12.5, need to substitute x = 12.5 in above equation to get number of articles received on Thursday.

On substituting x = 12.5, we get

4 ( (3 x 12.5 ) – 1 ) – 2 ( 6 + ( 2 x 12.5 ) )

=> 4 (37.5 – 1) – 2 (6 + 25)

=> 146 – 62 = 84

On substituting x = 12.5 , we are getting value of expression as 84.

Hence articles of clothing that the store received last Thursday is 84

3 0
3 years ago
Please help! I have to use the Pythagorean theorem for this but idk how to do that with four numbers
lana [24]

Answer:

Step-by-step explanation:

Remark

Simple answer: you can't. I mean that you can't try to use 4 numbers, but you can solve the problem. You are going to have to redraw the diagram on another sheet of paper. Follow the directions below.

Directions for diagram extension.

Go to the right hand end of the 10 unit line.

Draw a line from the intersection point of the 10 unit line and 12 unit line

Draw this line so it is perpendicular to the 18 unit line. That will mean that the new line is parallel (and equal) to x

Mark the intersect point of the new line and the 18 unit line as B

Mark the intersect point of the 18 point line and the 12 unit line as C

Given and constructed

BC = 18 - 10 = 8

BC is one leg of the Pythagorean triangle.

The new x is the other leg of the Pythagorean triangle.

12 is the hypotenuse.

Formula

x^2 + 8^2 = 12^2

x refers to the new x which is equal to the given x

Solution

x^2 + 64 = 144              Subtract  64 from both sides

x^2 +64 - 64 = 144-64  Combine

x^2 = 80                        Break 80 down.

x^2 = 4 * 4 * 5               Take the square root of both sides        

x = 4*sqrt(5)

Comment

If you want the area it is 4*sqrt(5)(10 + 18)/2 = 56*sqrt(5)

5 0
4 years ago
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STatiana [176]

Answer:

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Step-by-step explanation:

2 times 4 equals 8 and plus 3 equals 11 and dem is 4 so 11/4

8 0
3 years ago
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