Round 3.28 to the nearest thousandth

What is the binomial expansion of (2x-3)^5

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).