Question

Am I doing this right? If so, how do I do number 4? Please explain!!!!

Answer 1

Problem 4)

We want to know the value of r when the speed (V) is 55 mph. So we'll plug in V = 55 and solve for r.


`V = √(2.5r)`


`55 = √(2.5r)`


`(55)^2 = \left(√(2.5r)\right)^2`


`3025 = 2.5r`


`(3025)/(2.5) = (2.5r)/(2.5)`


`1210 = r`


`r = 1210`

Therefore the radius of the curve is 1210 feet