Can someone tell me the answer step by step about the surface area i really need i hope some can answer me

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Given sin∅ = 1/3 and 0 < ∅ < π/2 ; find tan2∅ a. (4√2)/9 b. 9/7 c. (4√2)/7 d.7/9