Hi guys can you answer my math questions and teach me how to do ​

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

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?