The formula p=0.01a^2 + 0.05a + 107 models a woman's normal systolic blood pressure, p, at age a. use this formula to find the age , to the nearest year, of a woman whose normal systolic blood pressure is 140mm hg.

$53.50

step-by-step explanation:

you have to subtract the amount of money chuck earned ($72.50) by the cost of the gas for the mower ($11.25) and the new string for the trimmer he bought ($7.75).

72.50-11.25=61.25

and then subtract $61.25 by the second thing he bought (the new string for the trimmer)

61.25-7.75=53.5

so in total it's $53.50 (53 dollars and 50 cents)