0.71 x 22 is the expression that works, because 1 AUD = 0.71USD.
Answer:

Step-by-step explanation:
we have

Adds the terms
Group terms that contain the same variable

Combine like terms

where

therefore

12.826+2.93= 15.756
Since you have to round it, your final answer would be 15.8
Answer:
- 1
Step-by-step explanation:
h = 20 – 5t2 = 15 -> t = 1
h = 20 – 5t2 = 10 -> t = 
interval
- 1