Find x so that the points A(0,0), B(x,5), & C(4,4) form an isosceles triangle with BA=BC

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

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?