Answer:
18
Step-by-step explanation:
6 + 6 + 6 = 18
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so the slope of that line above is really -4/3, now

The measure of angle 1 and 2 should add up to 180°, because it forms a straight line. The same goes for the sum of angle 3 and 4.
Since we are given the measure of angle 2, we can find the measure of angle 1 by subtracting 143° from 180°.
180°-143° = 37°
We know that the intersecting lines form 2 sets of vertical angles, which are congruent. This means that the angles opposite from each other have the same measure. Therefore, both angle 2 & 4 have a measure of 143°, while angle 1 & 3 have a measure of 37°.
Answer:
B
Step-by-step explanation: it is easy
(5•4)-8 the answer is 12 because 5 times 4 is 20. Then 20 minus 8 is 12.