When adding or subtracting two decimals what is the first thing you most do

Which point is on the line y=-2+3? (-2,-1) (3,3) (3,-3) (-3,-9)

Write the product as a trinomial. (x + 2)(x + 3) x2 + 5x + 6 x2 + 6x + 6 x2 + 6x + 5 x2 + 5

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.