Combine the like terms to make a simpler expression:

8r +7 -6r - 5 =

Answer this question, only if you know the answer. 30 points and brainliest!

Mikes car gets an average of 28 mpg. there are 12 gallons of fuel in mikes car when he starts his trip of 140 miles. about how many gallons are left at the end of his trip?

Bob paid $3 less than tim at a local pizza parlor. together they spent $7.80. how much did bob pay for pizza?