In the diagram, the measure of angle 9 is 85°. GO
1
2
516
4
3
8
7
910
13/14
1211
16/15
Which angle must also measure 85°?
22
0_5
_11

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

If the value of cos330°is√3/2 then find cos 165°.