How do i calculate the distance?

I just want to know if 1/3*7/9=3 6/7 is correct?

Find the length of each diagonal if AC=3y/5 and BD=3y-4

Find the distance between j (4,-5) and h (3,3)

Find 8.5 times the difference between 77 and 13

Which of the following defines liquid measure? A. The measure of how much space is filled by an object B. Units used to measure the volume of liquids, such as water, gasoline, and milk C. The volume of space inside a container D.

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.