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The highlighted part, where did it come from? Why did they multiply by each other? like the 300$(x-30). And where did x-30 came from?

The highlighted part, where did it come from? Why did they multiply by each other? like the 300$(x-30). And where did x-30 came from?

Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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The highlighted part, where did it come from? Why did they multiply by each other? like the 300$(x-30). And where did x-30 came from? 

Pipoline 30-2 O shoreline Wetey SouTce. Cost= $300(serx)+ $500 +x² -3 00 + Soor 2x -300 + x_ 500x Š1- 3 (1) 16x*> x 9x 16 9x256 : at 1- 12, e"!=) >0 .'. at point I:12 miled; on the shoseline, Pipe Should tuin into the watut to p ze Cart Tortal Cost = elb)= 300/30-h)+ 500 n²rase - s400+ so6 y00 - suo0¢ 500 X 20 Cost Total - 5Y
Transcribed Image Text:Pipoline 30-2 O shoreline Wetey SouTce. Cost= $300(serx)+ $500 +x² -3 00 + Soor 2x -300 + x_ 500x Š1- 3 (1) 16x*> x 9x 16 9x256 : at 1- 12, e"!=) >0 .'. at point I:12 miled; on the shoseline, Pipe Should tuin into the watut to p ze Cart Tortal Cost = elb)= 300/30-h)+ 500 n²rase - s400+ so6 y00 - suo0¢ 500 X 20 Cost Total - 5Y
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