How do I work this problem 11√605

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Measures of the angle of r, 31 s (x+4) t (3x+9)

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