Question

25 points!

What is the measure of angle D? (Hint: find "x" and then plug it in to find what x+3=.)
Please I really need the answer.

Answer 1

Okay, so. What I'd do is this.

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

Then I'd combine like terms.

So:

`(5x+3)+(x+3)=180\\ 6x+6=180`

Once you've got 6x, you subtract 6 from 180.

`(5x+3)+(x+3)=180\\ 6x+6=180\\6x=174`

Now all that's left to do is divide each side by 6 to get x.

X should be 29.

Explanation:

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

You know that adding the equations will give you 180 because you know they're supplementary.