The answer for your problem is shown on the picture.
Answer:
1200
Step-by-step explanation:
v=15×8×10
.
.
the second one i cant see clearly the number but u just need to multiple tgose two numbers
Start with

Add 2x to both sides:

Subtract 21 from both sides:

Divide both sides by 5. Since it is positive, we don't have to change the inequality sign:

So, the answer is 
Answer:
(5/24) gallons of gas to mow the side yard
Step-by-step explanation:
We can easily solve this proble by applying a rule of three
5/16 gallons of gas --------------------------------- for 1 backyard
x gallons of gas ------------------------------------- 2/3 backyard
x = ((2/3)/1)*(5/16) gallons of gas
x = ((2/3))*(5/16) gallons of gas
x = ((10/48) gallons of gas
x = (5/24) gallons of gas
I would assume that you convert 2.5 ounces into punds which would make it 0.15 lbs.