Anna is organizing 40 sheets of red and blue scrapbook paper. she places 15 blue sheets in each of 2 folders. then she splits the red sheets equally between the 2 folders. three of these equations can be used to solve for n, the number of red sheets in each folder. which equation cannot?

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?

Arrange the steps to solve this system of linear equations in the correct sequence. x + y = -2 2x – 3y = -9 tiles subtract 3x + 3y = -6 (obtained in step 1) from 2x – 3y = -9 (given) to solve for x. substitute the value of x in the first equation (x + y = -2) to get y = 1. the solution for the system of equations is (-3, 1). x = -15 the solution for the system of equations is (-15, 13). add 3x + 3y = -6 (obtained in step 1) to 2x – 3y = -9 (given), and solve for x. x = -3 substitute the value of x in the first equation (x + y = -2) to get y = 13. multiply the first equation by 3: 3(x + y) = 3(-2) 3x + 3y = -6.

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.