When can a law or theory be changed?

In the number 9,201,779 how many times greater is the 7 in the hundreds than 7 in the tens place?

Solve the system of equations shown below 8x-2y=1 -4x+y=3

6x-4y=24 in slope intercept form

What is the answer to this problem to this: - 5 (-7). solve

Penelope buys x pounds of bananas for $0.42 per pound and y pounds of apples for $1.19 per pound. A) Write an expression that represents the total amount Penelope spent on bananas B) Write an expression that represents the total amount she spent on

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.