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8) complementary, 45°

9) supplementary, 5x = 135°, (x+18) = 45°

10) alternate angles, 49°

Step-by-step explanation:

For 8th question

35 + 5x = 90° because the given angles are complementary

5x = 90 - 35

5x = 45

x = 9

For 9th question

5x + x + 18 = 180° because the given angles are supplementary

6x = 180 - 18

6x = 162

x = 27

For 10th question

3x + 1 = 49° because these angles are alternate

3x = 49 - 1

3x = 48

x = 16

step-by-step explanation:

6.48/4 4 goes into 6.48 1.62 times

noncoplanar points are points that do not lie on the same line.