How to I find a? It’s round to the nearest tenth.

a ≈ 21.8

Step-by-step explanation:

We require the third angle in the triangle

Subtract the sum of the 2 angles from 180

third angle = 180° - (75 + 31.8)° = 180° - 106.8° = 73.2°

Using the Sine rule, that is

= ( cross- multiply )

a × sin75° = 22 × sin73.2° ( divide both sides by sin75° )

a = ≈ 21.8 ( to the nearest tenth )

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right

answer: (c) m∠qpo + (2x + 16)° = 180°

step-by-step explanation:

the opposite angles of a quadrilateral are supplementary.

so, ∠o + ∠q = 180°   and   ∠p + ∠r = 180°

since ∠r = 2x + 16°, we can use substitution as follows:

∠p + ∠r = 180°

∠p + (2x + 16)° = 180°