Answer:
Each scholar have to sell 4 boxes in order to raise enough money to cover the team's travel expenses
Step-by-step explanation:
Let x denotes number of boxes to be sold by each scholar to raise enough money to cover the team's travel expenses.
Number of scholars = 7
Total number of boxes 
Total number of chocolate bars 
Price of 1 chocolate bar = $2
Price of
chocolate bars 
Also,
Total amount to be raised for travel expenses = $1680
So,

Therefore,
each scholar have to sell 4 boxes in order to raise enough money to cover the team's travel expenses
Answer:

Un-formatted answer:
2^x - 3
Step-by-step explanation:

One thing for sure it is not b,d,c its a
Answer:
Step-by-step explanation:
<u>Payment is</u>
<u>Divide both by 4/5 to find payment per hour</u>
- 7.20 ÷ 4/5 ⇔ 4/5 ÷ 4/5
- 7.20 ÷ 0.8 ⇔ 1
- 9.00 ⇔ 1
9.00 unit of money per 1 hour