<h2>C is the correct answer</h2><h2></h2><h3>The amount of money <u>depends</u> on how many lawns he mows.</h3><h3></h3><h3><em>Please let me know if I am wrong.</em></h3>
Y/3=6 and 4y/9=8 and since it asks for the sum the ANSWER IS 14!
I assume that there is an operato ^ missing in each function and that the right functions are:
f(m) = (m+40)^2 + 10 and
g(m) = (m+12)^2 - 50
C(m) = f(m) + g(m)
To perform that sum you need to expand the two square parentheses, this way:
f(m) = (m+40)^2 + 10 = m^2 + 80m + 1600 + 10 = m^2 + 80m + 1610
g(m) = (m+12)^2 - 50 = m^2 + 24m + 144 - 50 = m^2 +24m + 94
Now you can add f(m) + g(m) = 2m^2 + 104m + 1704
Answer: c(m) = 2m^2 + 104m + 1704
Total exercise time answer is C
Total calories burned answer is B
The athlete spent 38 minutes on the rowing machines
The athlete spent 22 minutes on the stair climber