Question

Help please urgent please​

Answer 1

30°

Explanation:

From what I can picture, I suppose that ∠CDE is an exterior angle and is supplementary to ∠CDB.

Since ∠CDE is supplementary to ∠CDB, m∠CDB measures:

`180-(7x-19)=199-7x`

And since the sum of interior angles of a triangle is 180°, we can write:

`(2x-1)+(199-7x)+(x+10)=180\\-4x+208=180\\-4x=-28\\x=7`

Substitute x back to ∠CDE:

`(7x-19)=(7(7)-19)\\=49-19\\=30`