1.The formula r=2sqrt(5L) can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 30mph?

2.What does it mean to refer to a 20 inch TV set or a 25 inch TV set? Such units refer to the diagonal of the screen. A 25 inch TV set also has a width of 20 inches. What is its height?

3. Give the formula to determine the sides of a right triangle.

Solution Preview

Hi,

1. The answer is:
30 = 2*sqrt(5T)
15 = sqrt(5T)
15^2 = 5T
225 = 5T
T = 45ft

2. The screen size ...

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