Question

3 and <4 are supplementary. If the m<3 = 13° what is the measure of <4?

Answer 1

Well supplementary means that both the angles add up to 180

We know that the measure of angle 3 is 13 degrees.
The measure of angle 4 is unknown
And the total of angles 3 and 4 are 180.
So you can make an equation

13 + x = 180
Solve for x

x= 167

Measure of angle 4 is 167

m< 4 = 167 degrees