What is the most hard subject in math

Any value that is set and cannot change is a variable

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. How long would it take for his friend to paint this fence alone?

ivy had two pages of math homework and four pages of reading homework. if each page had 5 problems on it, how many problems did she have to do in all?

What's the equation for - 2 (3x-4) + 9=2x+3

Consider the function f (x) = 49.5 (0.82) x select the correct word or phrase to complete each statement

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.