Answer:
a=23
Step-by-step explanation:
angle a, b,c and are congruent
3a-9+3a-9+3a-9=180
combine like terms
9a-27=180
add 27 on both sides
9a=209
divide by 9 on both sides
a=23
Answer:
607
Step-by-step explanation:
557+50=607
Answer:
0
Step-by-step explanation:
Okay...um. Any number times 0 is 0 so the expression you choose should equal 0.