Elton charges a standard price for every lawn mowed in his neighborhood. He charges a different rate for raking all the leaves off a yard. In one year, Elton mowed 109 lawns and raked 42 yards. Write an algebraic expression that represents how much money he made that year. a. (109 + m) + (42 + r)
b. 151 • m • r
c. 151 + m + r
d. 109m + 42r