?^2 when ? =5 im so confused on how to get my answer

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

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!