Lisa has a headache and takes some acetaminophen (perhaps Tylenol) at time t = 0. The amount A (in mg) left in Lisa's body at time t (in hours) can be modeled by: A (t) = 500et In 0.8 a) What was the amount of acetaminophen Lisa took at time t = 0? [ Select ] b) How many mg is left in Lisa's body after 4 hours? Use a calculator and round to 1 decimal place if needed. [ Select ] c) At what time is only 100 mg left in Lisa's body? Use a calculator and round to 1 decimal place if needed. (Answer in hours. Do NOT convert to minutes.) [ Select ]The expression f(x)-f(a) is the slope of |[ Select ] The expression f(x)-f(4) is the slope of [ Select ] v As @ gets closer to a , the slope of the secant line approaches the slope of the [ Select ] v of f (x) at a . The rate of change of f (@) at a is given by the slope of [ Select ] The rate of change of f (@) at @ is called the [ Select ] and is denoted by [ Select ]