Mario earns $9.40 per hour at his part-time job. Last month, he worked 7 1/4 hours the first week. 8 3/4 hours the second week,
5 1/2 hours the third week and 6 3/4 hours the fourth week. Mario puts half of his paycheck in the bank every other week starting with the first. How much money did Mario earn each week? How much did he put in the bank last month? How much money did Mario have to spend from his 4 paychecks.?
130=(1/3)(13)pix^2 times both sides by 3 390=13pix^2 divide both sides by 13 30=pix^2 divide both sides by pi 30/pi=x^2 sqrt both sides x≈3.09 radius is abou 3 units
= 144