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

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%