A herd of 31 horses has 8 white and some black horses. What is the ratio of black horses to white horses?

17. Mathieu has 4 white socks and 6 black socks in a drawer. He se- lects 2 socks at random (he's a lit- tle sleepy this morning) and puts them on. What is the probability that he wears socks of the same color? (A) 24/15 (B) 8/45 (C) 1/3 (D) 1/2 (E) 7/15 (F) none of the above

Show how to approximate the required work done by a Riemann sum. Then express the work as an integral an evaluate it.

A spherical water tank, 24 ft in diameter, sits atop a 60 ft tower. The tank is filled by a hose attached to the bottom of the sphere. If a 1.5 horsepower pump is used to deliver water up to the tank, how long will it take to fill the tank? (One horsepowerof work per second.)

A car collection has black cars, red cars and 7 white cars. Draw model of the car collection?