Answer:
6. Not so clear
7. 72 degrees
8. 5x + 60 = 180
9. 15 degrees
10. C
Explanation:
7. 4x + 12 + 3x + 4 = 121 So this is the equation for the whole angle ADC.
7x + 16 = 121 Collect like terms
7x + 16 - 16 = 121 - 16 Bring 16 to the other side of the equation
7x / 7= 105 / 7
x = 15
After finding the value of x substitute it into the equation for angle ADB thus:
4 ( 15 ) + 12 = 72 DEGREES
8. When those two angles meet they form an angle in a straight line thus they sum to 180 degrees.
9. So we already know of all angles except for 1 which is the one you need to find and what you simply do is:
Add 120 + 30 + 15 = 165
Then subtract 165 from 180 because they are angles in a straight line:
180 - 165 = 15 degrees
10. The answer is C because they are adjacent and they form a perpendicular.
HOPE THIS HELPED