Question

Help please! :)
Racing cyclists use the function r(x) = 4√x to determine the maximum rate, r(x), in miles per hour, to turn a corner of radius x, in feet, without tipping over. What is the maximum rate a cyclist should travel around a corner of radius 18 feet without tipping over? Leave the solution in simplified radical form.

Answer 1

Just replace x = 18 into the formula for r(x), then evaluate the right side

Answer 2

r(x) = 4√x
r(18) = 4√18 = 4√(9*2) = 4*3√2 = 12√2 miles per hour

Answer 3

very thankful :) you rock!

Answer 4

I'm guessing you're just looking for answers, right?

Answer 5

I do need to show work- but you did that already ;)

Answer 6

What I mean is, are you interested in understanding the concepts behind these problems?

Answer 7

Well, I thought that was right, by inputting 18 but I didn't think it was THAT simple and yes, I DO want to learn.