What is the sum of (2x - 4y) and (9x + 2y)? explain

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.

Acone with radius 5 cm and height 12 cm how many cm ?

Erin writes the set of ordered pairs below. the set represents a function. {(3, –3), (5, 0), (–1, 4), (–6, 7)} erin claims that she can add any point to the set and have the set still represent a function. which of the following points can be used to show that erin's claim is incorrect? select three that apply. (–6, 1) (–1, 9) (0, 5) (1, 7) (3, –2)