Angles AMB and CMD are right angles, ∠AMD is acute, and ∠BMC=y° is acute. What is ∠AMD ?  Choose the correct choice.
A) 90°−y
B) 180°−y
C) 90°+y
D) 2y
E) y
LAMB = 90   LCMB = y   so, LAMC = 90-y   and since LDMC = 90   LDMA = 90 - (90-y) = y   Answer: y
<result>E</result>
Angles AMB and CMD are right angles, ∠AMD is acute, and ∠BMC=y° is acute. What is ∠AMD ?