Answer:
1/ -2.65
2/ 1/8
3/ 14.28
4/ -7.9
Step-by-step explanation:
Just add and subtract.
Answer: 
Step-by-step explanation:
(a) Given
Sam charge $5 for each dog for a thirty minute walk
For an hour which is double the thirty minutes, it must be double of the same charge.

(b)Given
With $20, Christie sells 100 cups of lemonade with a quarter per cup charge
For 100 cup, she generate a revenue of

So, she earns
that is , her profit is 
24 times 2 pencils each student is 48 then you divide by 8 to get the number of packages needed which is 8.
2.6 gallons per hour x 16 hours = 41.6 gallons