1. Henry's little brother still sleeps in a crib at night. The crib is designed so the mattress can
be lowered as his brother gets older. The top and bottom pieces are parallel to one
another. Currently, his crib is on Level 1 as shown below. If the m <2 is 42°, find the m <4
and m <7.
m<4=138°
m<7 = 42°
