Question 1176620
Assume it's: 
The radius of a circle is 8 cm. 
(3x + 1) represents the length of the diameter. 
Write an equation for x.
{{{((3x+1))/2}}} = 8
 Then find the value of x.
3x + 1 = 2(8)
3x = 16 - 1
3x = 15
x = 15/3
x = 5