If the pattern shown continues how many black keys appear on an organ with a total of 240 keys

What is the answer 11x (-4x2+3x+8)

A girl was born 35 years after her mother what fraction of the mother's age would the girl be at age 15

Adam was going to sell all of his stamp collection to buy a video game. After selling half of them he changed his mind and did not sell the rest. He then bought ten more, How many did he start with if he now has 31?

5. Find the area of a triangle with sides a = 5, b = 8, and c = 11. A. 32.17 B. 20.88 C. 12.46 D. 18.33

Ameeta finished 12 math problems. David finished 3 times as many. How many more math problems did David finish than Ameeta?

Explain why the diagram shows that 6 (3 + 4) = 6.3 + 6.4.

A swimming pool has an area of 40 square meters. It's length is 8 meters. What is the width?

If you save $4,500 at an interest rate of 13 percent per year, how much will you have at the end of seven years?

Many performances at a circus take place in a circular ring. One circus has a ring with a diameter of 300 feet. Find the circumference of the circle.

Convert fraction to decimal 3.20