Solve for x:
-13 + x = 7 + 5x

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

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