What is the value of x? Enter your answer in the box. units

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

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

Is this a polynomial function? i need to know asap