What is the solution for this equation? by – 12) = 21
O {9, 33)
O {-9, 33}
O {-33, -9}
O {-33, 9}

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.