B. When two lines intersect they form two pairs of opposite angles. Vertical angles are always congruent, which means that they are equal. so m<7 = m<8 or m<3y + 19 = m<5y-29
I believe the answer is 4 because 6m/29= 20.6897 and so then you do 20.6897 x 3= 62.0691. So 3 is too small so do 20.6897x 4= <span>82.7588. 82 >78 so the answer is that you need 4 boards. </span>
