Continues the pattern 3, -6, 12, 4, 20

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

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

What dimensions can créate more than one triangle ?