Simplify each expression

12X-7X (1-9X) = - 3+9X (7X-1)

A girl went to school for the first time and the teacher ask her how old are you?, the girl said i dont know but i know my mother age is twice my age.

Explain how to use the combine place values strategy to find 223-19.

The scale of a drawing is 1 in.:4ft. Find the drawing length that would be used to represent an actual length of 24ft.

Choose an example of a fixed expense and an example of a variable expense, and explain why they are classified that way.

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.