Q (n - 1) + Q (n - 2) + Q (n - 3)

There are two bags of marbles. Bag A contains 9 red marbles and 3 green marbles. Bag B contains 9 black marbles and 6 orange marbles. Find the probability of selecting one green marble from Bag A and one black marble from Bag B.

A street light is mounted on a pole. The tip of the shadow of a man who is standing on a street a short distance from the pole has an angle of elevation to the top of his head of 28°.

The sum of a number and three is equal to five less than double that number

Jamaal has 20 models of planes and cars. He has three times as many cars as planes. What is the ratio of his cars to total models?

Anna buys dog food every 6 days and cat food every 9 days. If she buys both kinds of pet food today, in how many days will she next buy both kinds of pet food? A. 3 B. 6 C. 9 D. 18

The base of a rectangle has a length of 4 inches and a diagonal has a length of 5 inches, Find the area of the rectangle

A ball is thrown from an initial height of 7 feet with an initial upward velocity of 28/fts. The ball's height h (in feet) after t seconds is given by the following. = h+7-28t16t2 Find all values of t for which the ball's height is 15 feet.

The sum of two twin primes is 60. What are the numbers

The product BxA equals

You have 90 minutes to complete atleast 18 chemistry and math problems. It takes 5 minutes to complet a chemistry problem and 4 minutes for each math problem. Which is a possible solution to this equation?