I have been stuck on this and i know its probably easy but i don't have big brain so help. P. S this is not high school level im in 7th grade

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

Someone which statements are true? check all that apply.

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?