X= 102 • + (75) there you go
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Part A: c for cost. c=0.31m+0.5
0.31m is the cost per minute. 0.5 is cost per call.
Part B: 0.31m+0.5=5.15 to solve we must rearrange.
subtract 0.5 from each side giving us 0.31m=4.85
divide by 0.31 giving us m=15.65
N= P-180. so the computer would originally be 720 dollars. reduced by 25%, or 180, the new price is 540.
