An accident at an oil drilling platform is causing a circular-shaped oil slick to form. the volume of the oil slick is roughly given v(r) = 0.07πr^2, where r is the radius of the slick in feet. in turn, the radius is increasing over time according to the function r(t) = 0.4t, where t is measured in minutes.

1) find (v of r)(t) and simply it

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

What expression is equivalent to 1/2(2+3x-6)

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done