What is the same as the quotient of a number and it's self

What is the reflection image of (5,-3) across the line y = -x?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10