#1

A cell phone plan charges $49.85 per month plus $14.06 in taxes, plus $0.20 per minute for calls beyond the 400-minute monthly limit. WE a piecewise- defined function to model the monthly cost C(x) (in $) as a function of the number of minutes used for the month. {ll Xs l I for , Use interval notation to white the intervals over which fis (a) increasing, (b) decreasing, and (c) constant. 4- 3- 2- y =f(x) 1- -2 2 3 -1- -2 -3- -4- Part 1 of 3 O The function is never increasing. (0,0) OO - OO O The function is sometimes increasing. Increasing interval: OVO O The function is always increasing. X Increasing interval:Part2 of3 O The function is never decreasing. O The function is sometimes decreasing. Decreasing interval: I I O The function is always decreasing. Decreasing interval: I I Part3 of3 O The function is never constant. 0 The function is sometimes constant. Constant interval: I I O The function is always constant. Constant interval: I I EIUEI (DD) HUI] OO / Identify the location and value of any relative maxima or minima of the function. Ignore points on the boundary of the graph. If there is more than one answer, separate them with the "and" button. y The function has no relative minimum. (ELEI) 00 -OO O The function has one relative minimum. ElandEl O The function has two relative minima. X S A relative minimum occurs at the point(s) ' l. O The function has no relative maximum. 0 The function has one relative maximum. 0 The function has two relative maxima. A relative maximum occurs at the point(s) ' '. Produce a rule for the function whose graph is shown. (Hint: Consider using the basic functions and the transformations of their graphs.)