How do you expand the following?

(X+8) (x-8)

What is the scientific notation for 4.2389

What is 5.82 times 13?

If there are 42 biscuits between the ratio 1:6 (between two people), how many does each child get

What is 23.45 less than 56.004?

How can I solve the following system of equations: - 4x + y = 6, - 5x - y = 21. I know I can cancel out but I don't know where or where to go from there.

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.