the brain volumes (cm3) of 50 brains vary from a low of 918 cm to a high of 1498 cm3. Use the range rule of thumb to estimate the standard deviation s and compare the results to the exact standard deviation of 174.9 cm3, assuming the estimate is accurate if it is within 15 cm3

On new year's day, the average temperature of a city is 5.7 degrees celsius. but for new year's day 2012, the temperature was 9.8 degrees below the average. i) if a represents the average temperature on new year's day and 7 represents the temperature on new year's day 2012, what formula accurately relates the two values together? ii) what was the temperature on new year's day 2012? dt a 0.8 ii) - 4 1 degrees celsius da-t-98 ii) 59 degrees celsius 1) 7 = -9,8 11) 59 degrees celsius ii) l degrees celsius

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.