If 8^y = 16^y+^2 , what is the value of y? -8,-4,-2,-1

Can someone check my answer? you : )

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 ?

Josephine has a great garden with and area of 2x2 + x - 6 square feet