A) Given that 4^-6×4^x=1, find the value of x. b) Find the value of x^3 for which x^-3=7.
c) If 5^12×5^-2÷5^x=25, find the value of x.

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same