Branliets offered simplify the expression 3(x-2)+14 9.1-4(m+3.2) 5n+1/2(8n-7)

2x+20 for the first one

For 3(x-2)+14, 
Use distributive property:
3x-6+14
then add the like terms:
3x+8

For 9.1-4(m+3.2)
Distribute -4:
9.1-4m-12.8
add like terms:
-4m-3.7

For 5n+1/2(8n-7)
Distribute the 1/2:
5n+8/2n-7/2
simplify:
5n+4n-7/2
add like terms"
9n-7/2

No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer

25 inches - 0.694 yards