Answer:
it's answer is 2a + 6a - 21
Step-by-step explanation:
2a + 3 ( 2a - 7)
= 2a + 6a - 21
Hope it will help :)❤
71
Step-by-step explanation:
subtract all from 360 degrees
I believe it's 20! Good luck!
Answer:
Option C. 
Step-by-step explanation:
we know that
If two figures are similar, then the ratio of its perimeters is equal to the scale factor
and
The scale factor is equal to the ratio of its corresponding sides
Let
z-----> the scale factor

simplify

Answer:
180
Step-by-step explanation:
5 +4 = 9
9 times 20 = 180