Please help me, pretty please :(((

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 table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?