<span>2.1e-10
= 2.1 x 10^-10
= 0.00000000021
hope it helps</span>
Answer:
The angle of A is 80°
Step-by-step explanation:
Given that angle A lies on a straight line which is 180°. So in order to find A, you have to substract 100° from 180° :
∠A + 100° = 180°
∠A = 180° - 100°
∠A = 80°
The answer is what that guys said
(Also what grade is this?)