The amount (A) in milligrams of aspirin in a person's bloodstream can be modeled by A = (391t^2 + 0.112)/(0.218t^4 + 0.991t^2 + 1) where t is the time in hours after one dose is taken.

a. A second dose is taken one hour after the first dose. Write an equation to model the amount of second dose in the bloodstream.

b. Write a model for the total amount of aspirin in the bloodstream after the second dose is taken. (The second dose plus the first one)

Josephine has a great garden with and area of 2x2 + x - 6 square feet

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

What is mean median mode and range?