Which expression is equal to x^2- y^5?

Evaluate the expression. (9 + 5)(3 + 2)0

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.