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The slope intercept equation will bey = 15x + 95The cost for 77 people is$1250Using slope intercept equation.y = mx + bwherem = slopeb = y-interceptTherefore,letnumber of attendance = xy = mx + 95The slope intercept equation is as follows:y = 15x + 95Let find the cost for 77 people.y = 15x + 95y = 15(77) + 95y = 1155 + 95y = 1250The cost of 77 people is$1250learn more:brainly.com/question/20564632?referrer=searchResults...