Question

Please help me in this question please ​

Answer 1

x = 18

Explanation:

the square on the angle means the angle is 90 degrees

4x + x = 90

5x = 90

x = 18

Answer 2

`\boxed{\bf x = 1 {8}^(o) }`

Explanation:

In the given figure....

`\boxed{\bf m\angle BOA = 9 {0}^(o)}`

`\bf m\angle BOA + m\angle COA = 9 {0}^(o)`

• 
  `\bf 4x + x = 9 {0}^(o)`

Combine like terms. 4x + x = 5x

• 
  `\bf 5x=90`

Divide both sides by 5.

• 
  `\bf \cfrac{5x}{5} = \cfrac{90}{5}`
• 
  `\boxed{\bf x = 1 {8}^(o) }`