Atelephone company offers a monthly cellular phone plan for $ 39.99 it includes 300 anytime minutes plus $ 0.25 per minute for additional minutes.

the following function is used to compute the monthly cost for a subscriber, where x is the number of anytime minutes used.

upper c left parenthesis x right parenthesis equalsc(x) =39.99
if 0 less than x less than or equals 3000 < x ≤300
0.25 x minus 35.010.25x−35.01
if x greater than 300x > 300
compute the monthly cost of the cellular phone for use of the following anytime minutes.
(a) 170=$
(b) 335=$
(c) 301=$

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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