Question

Please help...

If ABCD ≅ QRST, m<A = x - 10, and m<Q = 2x - 30, what is the m<A?

A. 10 
B. 20
C. 30
D. 40

Answer 1

If ABCD ≅ QRST, then m∠A = m∠Q. Therefore we have the equation:

x - 10 = 2x - 30 |+10

x = 2x - 20 |-2x

-x = -20 |change the signs

x = 20

Answer: B. 20