If (a - b)2 + (a + b)2 = 24, then a2 + b2 =
(A) 4
(B) 12
(C) 16
(D) 18

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account