Question

Question #407f8

Answer 1

157°

Explanation:

Opposite angles in quadrilaterals always add up to 180°.

So,
`x+(6x+19)=180`
`7x+19=180`
`7x=161`
`x=23`

To find out the measure of angle B, plug in `x=23` for `6x+19` and you get `157 °.`