Find m HELP THIS IS IMPORTANT

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Ineed with number 6 , explain how to get 1978

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.