0.5 x (4a + 6b) using the distributive property

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

M∠cbd=4x+52∘ m∠abc=8x−10∘\qquad m \angle abc = 8x - 10^\circm∠abc=8x−10∘ find m∠cbdm\angle cbdm∠cbd:

27/9=18/x a. x=9 b. x=18 c. x=6 d.x=3