The concentration C in milligrams per milliliter (mg / mL) of a certain drug in a person's bloodstream t hours after a pill is swallowed is modeled by the approximation C(t) =- 4t + 0.03t. Estimate the change in 4 +t3 concentration when t changes from 10 to 30 min.

A driver of a car stopped at a gas station to fill up his gas tank. He looked at his watch, and the time read exactly 3:40 p.m. At this time, he started pumping gas into the tank. At exactly 3:44, the tank was full and he noticed that he had pumped 10.7 gallons. What is the average rate of flow of the gasoline into the gas tank?

Find the intensity of light at a depth of 12 meter if I0=14 and k=0.7. Round to two decimals.

The population P (in millions) of Texas from 2001 through 2014 can be approximated by the model P=20.913e0.0184t, where t represents the year, with t=1 corresponding to 2001. According to this model, when will the population reach 32 million?

Find the intensities of earthquakes whose magnitudes are aR=6.0andbR=7.9.

When a skydiver jumps from an airplane, his downward velocity, in feet per second, before he opens his parachute is given by  v = 176(1 − 0.834t ),  where t is the number of seconds that have elapsed since he jumped from the airplane. What is the velocity after 6 seconds? (Round your answer to two decimal places.) ft/s

The number of acres in a region cleared for farming follows the formula A = f(t) = 4t2 where t is the number of years since the region started to be farmed and t ranges from t = 0 to t = 10. Find the average rate of change in the number of acres cleared for farming between t = 2 and t = 8. Select one: a. 64 years/acre b. 40 years С. 240 acres O d. 24 years/acre e. 40 acres/year