I really need help on this plzz

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

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days