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One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-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

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg