David washes 10 cars and waxes 4 cars every Saturday. He earns $5 for each car he washes and $12 for each car he waxes. How much money does he earn on 3 Saturdays in dollars?

Explanation:

for washing the car he gets 15$

and for waxing car he gets 36$

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.

that is probably something for you to answer