Help! please show some sort of proof! thanks xo ive asked this question 4.. times please someone help its already late.

A

Step-y-step explanation:

all straight lines equal 180, half of 360 which would be a circle. 10 times 4 equals 40 and you add the two angles together to get 180.

I can answer now yay

x = 4

Step-by-step explanation:

The two angles are supplementary because they add up to 180. We know this because both angles lie on a line, which makes a straight angle.  so we can make the equation and solve using algebra    

180 = 10x + 140         subtract 140 from both sides

-140          -140

40 = 10x                  divide each side by 10

/10    /10

4 = x  or x = 4

518,400

step-by-step explanation:

the area is multiplying all the given measurements together.

40 * 18 * 30 * 24 = 518,400