Question 2 Determine the intersection X n Y. Express the answer in interval notation.
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X = (x1x218) and Y-{X1 < 11)
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Select one:
a. (11,18]
b.)
c. (-0, 11) U (18,00)
d. [11, 18)

answer: 12

step-by-step explanation:

because yes

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

3

step-by-step explanation:

answer: (-6,3)

step-by-step explanation: