Question

3. Find mZBDC

(-3x + 20°
5
(-2x + 55)
a. 290
b. 61°
c. 25°
d. 750

Answer 1

-3x + 20 + -2x + 55= 180

-5x + 75= 180

-5x = 105

x = -21

-3(-21) + 20= 63 + 20 = 83°

-2(-21) + 55= 42 + 55 = 97°