Answer + Explanation:
<h3>16.</h3>
sum of opposite two angles = one exterior angle
50° + 20° = d
d = 70°
<h3>17.</h3>
A straight line has total 180° angle.
a + d = 180°
90° + d = 180°
d = 180° - 90°
d = 90°
<h3>18.</h3>
sum of opposite two angles = one exterior angle
52° + 78° = d
d = 130°
<h3>19/20.</h3>
If a = 90° then d = 90°
Then b = 90 - c and c = 90 - b
<h3>21.</h3>
If d = 105°, then c = 105 - b
Answer:
y = -8
Step-by-step explanation:
-7y + 11 = 75 + y
Bring the <em>"</em><em>y</em><em>"</em><em> </em>variable on one side, and rest on the other.
Rearranging, we get,
-7y - y = 75 - 11
-8y = 64
-y = 8
y = -8
<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em> </em><em>:</em><em>)</em>
10 to the third power is 1000
-3/4x+y = -5/2 is the answer.