"shannon drove her car 140 miles east at a rate of 70 miles per hour. how long did she travel? a.1 hour b.2 hours c.20 hours d.20 minutes"

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 = _