Answer:
its 9
Step-by-step explanation:
Group like terms first
3a-6a+2ab-ab+2b
add
-3a+ab+2b
that is simplified
b= 81 degrees
Explanation:
A straight line is 180 degrees.
180 - 99 = 81
All the angles combined should be equal to 360, forming a circle.
Answer:
30
Step-by-step explanation:
3x+x=4x
40+20=60
180-60=120
120/4=30
Answer:
6 different groups.
Step-by-step explanation:
This is the number of combinations of 2 fro m 4:
4C2 = 4! / 2! 2!
= 4 * 3 *2 *1 / (2*1*2*1
= 24/4
= 6 groups.
