I’m stuck on this problem

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 monetary value earned for selling goods or services to customers is called a.) revenue b.) assets c.) money d.) accounting

How do i put 3(x+7) in distributive property