O raio é de 71,4 milímetros
142,8mm/2 = 71,4
12/15=4/5 original speed
12/20=3/5 increase by 5mph
He will reach 12 minutes earlier than he goes 15 miles per hour.
Correct me if I am wrong.
Answer:
The answer to your question is Circumference = 81.64 ft
Step-by-step explanation:
Data
Area of a circle = 530.66 ft²
Circumference = ?
π = 3.14
Process
1.- Calculate the radius of the circle
Area = πr²
-Solve for r²
r² = Area / π
-Substitution
r² = 530.66 / 3.14
-Simplification
r² = 169
-result
r = 13 ft
2.- Calculate the Circumference
Circumference = 2πr
-Substitution
Circumference = 2(3.14)(13)
-Result
Circumference = 81.64 ft
Answer: 
<u>Switch operations</u>
Before: 
After: 
Before you switch operation you remove the subtraction sign where -(16) is.
21 can go into 44 2 times