171 hours including the 3 hours you said.
8y-9-4y+5=12y-4-5y
4y-4= 7y-4
Add 4 to both sides
4y=7y. The only answer is 0
500 inches is greater than 40 feet because, every 12 inches is 1 foot. Since every 12 inches is 1 foot you have to divide. 500÷12=41.6667. Hope this helps!
