Question

Please help, I’m being timer

Answer 1

Answer: ∠BDA = 21; CB = 30

have:

sin ∠BDC =
`(4x+6)/(BD)`

sin ∠ADB =
`(7x-12)/(BD)`

because ∠BDC = ∠ADB => sin ∠BDC = sin ∠ADB

=>
`(4x+6)/(BD)=(7x-12)/(BD)`

=> 4x + 6 = 7x -12

<=> 3x = 18

<=> x = 6 => CB = 4.6 + 6 = 30

Explanation:

Answer 2

CB=18

And the measure of angle BDA is 21 degrees

Explanation: