Help I’m being timed!!

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.

An equation where variables are used to represent known values—function notation true or false