Which expression is equal to 3/√7? a. 3√7/7 b. 3√7/49 c.7/3√7 d.21/√7

3√7

(Answer A).

   7

Step-by-step explanation:

The expression 3/√7 has a radical in the denominator.  Most times when you're asked to simplify such an expression, you're actually being asked to rationalize the denominator:  remove the √ sign from the denominator.

Given 3/√7, the first thing we need to do is the multiply both numerator and denominator by √7.

This results in:

3√7

(Answer A).

   7

answer: x=60

"exterior angles = 360 / number of sides.

60 = 360 / sides

sides = 360 / 60

sides = 6"