Find a. 1/x^-3 = x^4*x^a

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Determine the solution for mc001-1.jpeg