Answer:
C) 
Step-by-step explanation:
The formula for area is
A=pi * radius ^2
If the diameter is 40, the radius is 20
Therefore

The following that are mathematical sentences are b,c
What does the <span>^ mean? I feel so stupid</span>
He used distributive property
Answer:
500 ≤ 260 + 6x
240 ≤ 6x
40 ≤ x
x is the number of minutes you can use per day.