Joe makes 42 a day. He makes 2 for each cd sold. Write an inequality to show how many cds, N, are needed to make 80 a day

Question

Solve

 

Answer 1

It appears you are trying to say that Joe

earns $42 per day plus$2 per cd sold. 

To earn at least $80 per day:

 

2n + 42 ≥ 80

2n ≥ 38

n ≥ 19

 

If Joe sells 19 cd's he will earn $80.

For each cd over 19 he will earn an

additional $2

Answer 2

I assume we are talking about dollars. If the problem is asking how many CDs Joe needs to sell in order to earn at least 80 dollars per day, then it would be an inequality. If the problem is asking how many CDs must be sold in order for Joe to earn exactly 80 dollars per day, then we simply have an equation. I will assume the first scenario is what the problem is seeking.

 

If N represents the number of CDs that Joe sells per day, then we have:

 

2N ≥ 80

 

N ≥ 40

 

Joe would need to sell at least 40 CDs per day to make 80 dollars in a day.