Mr Emmert went to the store to get 15 cans of green beans. If there is a sale that says "buy 6 for $10", then how much will it cost to buy 12? What about 15?

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

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Bring the fraction a/a-4 to a denominator of 16-a^2