X = 42 whats the answer

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

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

2,10,-50 next two numbers geometric sequence