I hope this helps you
m (I)= m (P)
3x+4=72-x
4x=68
x= 17
Answer: 40.192 cm
Step-by-step explanation:
the formula for circumference is 
In this case we are using 3.14 for pi and the radius is 6.4

Answer:
6 nickels and 9 quarters
Step-by-step explanation:
x- nickels
y- quarters
----------------
the 2 equations are:
add up the 2 equations:
then
Answer:
3 hours
Step-by-step explanation:
60 x 60 = 3,600 x 3 = 10800