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18-10-2018
Mathematics

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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

Respuesta :

24-10-2018

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

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