Answer:
hey
Step-by-step explanation:
angle 7x-9 +angle 4x=90°
11x=90+9
11x=99
x= 9°
∠CBD = 54°
∠ABC = 90°
∠ABD + ∠CBD = ∠ABC
4X + 7X -9 = 90
11X = 90+9
11X = 99
X = 99/11
X=9°
∠CBD = (7X -9)° = 7 * 9 - 9 = 63-9 = 54°
