C=2pi2
c=12.56
so the last one
Answer:

Step-by-step explanation:
So, Tanvi started with b buttons.
And she gave away 17.
Since she "gave away," this means that we should use subtraction.
Therefore, she now has b-17 buttons.
Our expression is:

Answer:
6:7
Step-by-step explanation:
divide both sides by 7...
161.5 miles / 3.5 hrs = 46.143 mph