What is the inverse of 12e^2x

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Solve the equation by completing the square. x^2+2x=17

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