Identify: Expressions that are equivalent by using of operations? Help Me Please.

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

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Someone me what is the area of this figure? 18m 18m 8m 16m