how to calculate the circumference of a circle when given either a diameter or radius and also how to estimate the circumference of a circle

How to calculate Circumference:

2πr=c, 2 x 3.14 x Radius = Circumference

If given the diameter, divide that by two to get the radius.

~Hope this helps~

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

what are you trying to solve here

step-by-step explanation: