Which formula could be used to determine the circumference of a circle?

What percent of earths water does the Indian Ocean contain?

Amy is a perfectionist and wants each piece of her cake to be exactly the same area. If the radius of her cake is 6 in and she wants to cut it into 10 pieces, what is the area of the top of each piece of cake? (Round to the nearest tenth)

Nicole has a rectangular canvas that is 12 inches long and 10 inches wide. She paints a blue square in the center of the canvas. The sauare is 3 inches on each side. How much of the canvas is not painted blue?

Which of the following equations could be used to solve for the tenth term of the following sequence? 15, 13, 11, 9, ... A (10) = 15 + 10 (-2) A (10) = 15 + 9 (-2) A (10) = 15 + 9 (2) A (10) = 15 + 10 (2)

Y=33x proportional or not

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.