Can yall help me with 1 to 4 pleasee <33

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

What is the value of x in the equation (2)3) (x+6)= -18 a. -36 b. -33 c. -24 d. -18

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?