Answer: 
a=-3
b=-9
Step-by-step explanation:
Answer:
Zero
Step-by-step explanation:
Because integers are equal in magnitude but opposite in sign, therefore they will cancel out each other leaving zero as answer.
Answer:
6x+25
Step-by-step explanation:
Answer:
You need 40 packs of stickers.
Step-by-step explanation:
20x10=200 stickers
Double it and you'll get 40x10=400
Answer:
Santino rented the canoe for 8 hours.
Step-by-step explanation:
The total bill is represented by the formula r(h) = $10 + ($7.50/hour)h,
where h is the number of hours over which the canoe is rented.
If the total bill is $70, then $70 = $10 + ($7.50/hour)h.
Solve this for h. Start by subtracting $10 from both sides, obtaining:
$60 = ($7.50/hour)h.
Dividing both sides by ($7.50/hour), we get:
$60
h = --------------------- = 8 hours
($7.50/hour)
Santino rented the canoe for 8 hours.
