Answer:
B.
Step-by-step explanation:
3 x 7 = 21, so it is B. You can't multiply 3 by anything to get the other numbers.
Answer:
4
Step-by-step explanation:
Im not completely sure
Answer:

Step-by-step explanation:
-3 is less than 0, so you are going to use
.
Plug in values:

I) 156 degrees
The exterior angle is 180-156
=24
The number of sides=

The number of sides= 15 sides
ii) 162 degrees
The exterior angle= 180-162
=18
The number of sides=

= 20 sides
Answer:
4
Step-by-step explanation:
5^2-3^2=16
sqrt16=4