Notes on how to multiply/divide with scientific notation

If seven x multiple by 3 is 63, what is x?

In a company, 60% of workers are men. If 1,380 women work for the company, how many workers are there in all? Show two different ways you can solve this problem.

Write down a number that is not a rational number. explain why.

How solve - 3n - 6n = 18

A cylinder is 8.2 inches high and has a diameter of 8.2 inches. Find the volume to the nearest tenth. Use 3.14 for pie

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.