How can I find out if 80 is 25% of a number

the temperature is - 3 degrees. and hour later, it drops 6 degrees and 2 hours later, it rises 4 degrees. write an addition expression to describe this situation. then find the sum and explain its meaning.

When x=6 which expression can be simplified to 6 √ 2

What's one tenth of 7,000

What is the area and perimeter of 11 by 8

The temperature was 15 degrees below 0 (in Fahrenheit) today. Write a signed number to represent this temperature.

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.