Let L1 be a line with slope m1 and L2 be a line with slope m2 the L1 and L2 are perpendicular lines if and only if m1 +m2 =-1 * true
or
False​

Which formula gives the area of a triangle? a=1/2(b+h)

What is the fewest number of full weeks briyana would have to work to have enough money? 8 weeks9 weeks 10 weeks11 weeks

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.