Question

Please help!!!!!!!!!!!!!!!!!

Answer 1

A = 75º

D = 105º

Explanation:

We know that the sum of these angles must be equal to 180. Let's make an equation.

`3x+(5x-20)=180`

Get rid of the parentheses and combine like terms,

`3x+5x-20=180\\8x-20=180`

add 20

`8x=200`

Divide by 8.

`x=(200)/(8)\\ x=25`

To find the measure of angle A and D, replace x by 25.

`3x=3(25)=75\\5x-20=5(25)-20=125-20=105`