For easier, let's say x represents a pack of 10 and y represents a pack of 30
we can start with 2 of the 30's
2y=60
we can replace one of the 30's with 3 of the 10's
y+3x=60
and finally we can use all 10's
6x=60
there are only 3 ways
1.89×4=7.56 7×2.49= 17.43
17.43+7.56=24.99
so d is your answer
Answer:
A. y = -12.5 + 28000
B. $700
Step-by-step explanation:
The answer is B, I attached a picture of the steps.