PLEASE HELP ME ASAP, STRUGGLING WITH PART B AND RATE OF CHANGE please use the formula below !!

What is the solution for 6 - 7/8? explain the steps.

Consider this expression and the steps to evaluate it. 4^5(−2)^9/4^8(−2)^3 1. apply the quotient of powers:      (−2)^a/4^b 2. evaluate powers:           c/d select the value of each variable. a = _ b = _ c = _ d = _

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20