What are factors and multiples

What is 8.239 rounded to the tenths place.

What is the density of a mineral with a mass of 68.4 grams with a length of 1 cm, a width of 2.5 cm and a height of 2 cm?

Timothy is the manager of a car wash. Last week, there were 40 customers. This week there were 75% more customers than last week. How many customers were at the car wash this week?

A number increased by 4 is the same as 19 minus 2 time the number

What number has 2 ten thousands, 4 more thousands than ten thousands, 5 more hundreds than ten thousands, 2 fewer tens than hundreds, and 5 more ones than ten thousands?

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.