What value of k makes the equation true?
(5a^2b^3)(5a^kb)=30a^6b^4

What is the equation of the graph below? y=sec(x)-4

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

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