Question

The city’s water company charges a fee of $20 a month in addition to a $0.25 per every gallon used. Using the function c=0.25x+20, where c is the total cost per month for water services and x is gallons used, which of the following points on the graph accurately represents a monthly usage of 1,200 gallons?(1 point)
Responses

(1,200,320)
open paren 1 comma 200 comma 320 close paren

(1,200,300)open paren 1 comma 200 comma 300 close paren

(1,200,−180)open paren 1 comma 200 comma negative 180 close paren

(320,1,200)open paren 320 comma 1 comma 200 close paren

Answer 1

Plug in x = 1200: c = 0.25(1200) + 20 = 300 + 20 = 320.
So the point is (1200, 320) — the first option (1,200,320).