Find all natural numbers, which when divided by 7, leave the same number for the quotient and the remainder.

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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.

Ihonestly have no clue if it's each or none.