Please help. Will mark brainiest. + 20 points!! Place the indicated product in the proper location on the grid. (3 xy - 1) (4 xy + 2)

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

Given that abcd is a rhombus, what is the value of x?

What is the radius of the cone in the diagram? round your answer to the nearest whole number