The ratio of boys to gils in art class is 1: 2 there a 12 girls in the class. how many boys are there

A+b= 17, ab=70, find the value of |a-b|

Darcy deposited $390 into a savings account. as long as the account balance remains at or above $150, she does not have to pay a service fee for the account. for how many months can she withdraw $40 a month without having to pay service fees? a) 3 b) 5 c) 6 d) 9

The half-life of iodine-131 is approximately 8 days. find the amount of iodine-131 left from a 42 gram sample after 16 days. a: 10.5 grams b: 21 grams c: 0.0006 grams d: 34 grams