the cost of eight cds and fifteen dvds is 186.31 and the cost of nine dvds and thirteen cds is 167.09 How much do a[..]

it takes 3hrs for 2 concrete mixers to mix a fixed amount of concrete. the number of hours varies inversely as the[..]

the distance d traveled by a train varies directly as the time t that it travels. the train travels 60km in 1/2[..]

a game warden cathces, tags, and then releases 15 zebras. a month later a sample of 20 zebras is collected and 6 of[..]

Prove that if a, b, and c are real numbers such that a^2+b^2+c^2=0, then a=0, b=0 and c=0.

I need the process to solve this problem: Bob is one third the age of his father. In 12 years he will half the[..]

Jamal has a jar of 368 nickels and dimes. The total value of coins is $28.40. how many nickels and dimes does jamal[..]

A family of five people has $200 to spend of fishing rods and fishing licenses. They spend a total of $20 on[..]

Bob is one third the age of his father. In 12 years he will be half the age of his father. How old is each now?

The pier on a dock was 550ft long. A shark bit off a piece. The remaining dock was 20ft more than 3 times the[..]