Susan is writing a linear equation for the cost of her cell phone plan. in the first month, she talks for 52 minutes and is charged $19.41. in the second month, she talks for 380 minutes and is charged $45.65.

a) how much money does susan's cell phone company charge for each minute?
b) write an equation that susan can use to determine the cost of her cell phone plan, y, as it relates to the number of minutes used, x.

Suppose that f(0) = −3 and f '(x) ≤ 8 for all values of x. how large can f(4) possibly be? solution we are given that f is differentiable (and therefore continuous) everywhere. in particular, we can apply the mean value theorem on the interval [0, 4] . there exists a number c such that

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

Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily