Does (9y)(5)+(99)=
i know its easy but i need advice so hel

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

7+(3n++8) what is the answer to this?