A and B are independent events. Find P(A and B) P(A)= 1/5, P(B)=3/7

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?