Colby graphed a scatter plot of student exam scores (y) and the number of hours each student had slept the night before the exam. she drew the trend line and calculated its equation to be y=9/2x + 60. what is the predicted score for a student who slept 6 hours the night before the exam?

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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.