Find volume of sphere with radius of 9cm

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Which number produces a rationale number when multiplied by 1/5

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