Make to a true statement square root 16 is greater , less than, or equal to 4.001

With this one. will mark brainliest

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.

If a || b and e || f , what if the value of y ?