Answer:
1. decreases
2. 31.50
Step-by-step explanation:
It decreases because there's a negative sign.
It's 31.50 because 10.50 * 3 = 31.50
Check the attachment for the answers. Click on it again to make it bigger.
Answer:
18
Step-by-step explanation:
To continue where you left off, ...

The square root of 324 is 18.
30 .....................................
21.7 L/day
280 day
0.5 L/bottle ,therefore,it's not hard to tell, the answer is 21.7*280/0.5