*select all that apply.* the slope of the graph of a direct variation function is -3. which of the following is true? the equation of the function is y = -1/3x. the point (2, -6) is on the graph of the function. the equation is y = -3x. the function is linear.

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