What is the relationship between the 6's in 660

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.