Segments AC and BC are diameters of circle O. What is the measure of ADB?
a) 107°
b) 146°
c) 253°
d) 287°

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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.

Me because i don't understand how to do it.: )