What is f(x)=8x2+4x written in vertex form

Given that abcd is a rhombus, what is the value of x?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

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