- We know, sum of all angles of a triangle is 180°.
- Therefore, by the problem
72 + 64 + (4x+20) = 180
or, 156 + 4x = 180
or, 4x = 180 - 156
or, 4x = 24
or, x = 24 ÷ 4 = 6
<h3><em>Your </em><em>answer </em><em>is </em><em>6</em><em>.</em></h3>
Answer:
+
i
Step-by-step explanation:
Using the exact value
cos60° =
and sin60° =
, then
3(cos60° + isin60°)
= 3(
+
i) ← distribute by 3
=
+
i ← in the form a + bi
A) [-7,-4] U [4,7]; B) [-4,-1]; C) [1,4]