Answer:
I think like expressions you use x or y or such many variables. you use - or + too. like (x+2)y there are parentheses too.
Answer:
5p9
Step-by-step explanation:
32 in. because 2.5 feet is only 30 in
The pyramid formula:

The volume in this case would be:
1/3×7.9×4
=79/30×4
=10.5333...
≈10.5 m^3
Answer:
9/20
Step-by-step explanation:
You set the fraction up at first as 45/100. Then you know that 5 goes into each so you divide by 5
45/5=9
100/5=20
You get 9/20, and this is in simplest form.