Which is equivalent?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Evaluate cos2θ for cosθ = square root of 3/2

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?