Answer:
If I remember correctly, right angles are 90 degree angles. So the answers would be A. B. and C.
Step-by-step explanation:
If you see the little box on the angle, that means it's a 90 degree (right) angle.
The aswer would be B because you have to divide a couple numbers to get 20in.
It's A, increased by a factor of 6.
Answer:
or 
Step-by-step explanation:
Given

Required
Find the possible values fo x

Square both sides


Equate to 0

Expand

Factorize:


Split:
or 
or 
or 