4^{5} times 4^{3} what's the answer

possible answers
4^{8} , 4^{15} , 16^{8} , 16^{15}

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

The area of a rectangle is 54x^9y^8 square yards. if the length of the rectangle is 6x^3y^4 yards, which expression represents the width of the rectangle in yards

How much orange juice do you need to make 2 servings of lemony orange slush?