If (a, b) is the solution to the system of equations, what is the value of b? a-2b=24
6b=80-a

A)7
B)14
C)19
D)38

Can someone me with this problem . show your work .

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of