Write an exponential function in the form y=ab^xy=ab x that goes through points (0, 4)(0,4) and (5, 128)(5,128).

Find the slope of the line y =8/9x + 1.

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

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?