What is the fourth measure

60 degrees

Step-by-step explanation: The interior angles of a quadrilateral add up to be 360 degrees.

100 + 120 + 80 + x (your unknown angle) = 360.

Add up all the angles

300 + x = 360

Subtract 300 to isolate x

x = 60

$20.01

step-by-step explanation:

the sale price is (1.00 - 0.77)($87), or 0.23($87), or $20.01.

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation: