A reduction of 15% per year means 100-15=85% reducing factor. 1st year: 0.85×18000=$15300. 2nd year: 0.85×15300=$13005. 3rd year: 0.85×13005=$11054.25. So after 3 years the value of the car is $11054.25 or $11054 to the nearest dollar.
Very simple. Just add/multiply the like terms, (14x^-10x & 12+2), and then you'll get the answer, but since 140x and 14 are not like terms, the answer stays as 140x+14.
