30+18=30+6y
18=6y
y=3 so the answer is 3
4.5 quarts per minute is 1.125 gallons per minute using the quarts-to-gallons conversion ratio. 1.125 gallons per minute is equal to .01875 when divided by 60, so we have .01875 gallons per hour.
The given graph is for a piecewise function consisting of two intervals:
(1) x ≤ 1 ⇒⇒⇒ the graph in this interval like <u>a cubic </u>function.
(2) x > 1 ⇒⇒⇒ the graph in this interval like <u>a quadratic </u>function
By comparing to the given options
<u>The answer is option c.</u>
