$40 + $7.50x = 62.50 so what you do is take 62.50 - 40 = 22.50 and divide 22.50 by 7.50 which is 3 so 3 hours
Answer:
volume=πr²h
75.36=<u>2</u><u>2</u><u>×</u>3×3×h
7
75.36=<u>198×</u>h
7
7×75.36=<u>198×h×7</u>
7
<u>527.52</u>=<u>197×</u>h
197. 197
h=2.68
If you are looking for this equation simplified, your answer will be -2w^2-5wz-14z^2+6w+5z