Why do we use variables and what's the significance of using a variable?

An event has a theoretical probability of 0.5. what does this mean?

Each baseball team has nine players and each football team has eleven players. Six schools have both baseball and football teams. Four schools have only a baseball team. How many players are there for all ten schools?

What is the ratio for the volumes of two similar spheres, given that the ratio of their radii is 3:4?

Rosa works in an office building with many floors. From her office, she goes down 2 floors for a meeting. Then, she goes up 8 floors to have lunch. After lunch, she goes down 13 floors to the first floor. What floor is Rosa's office on?

170 percent converted to a fraction equals: ... ?

Which function describes the arithmetic sequence shown? 1, - 2, - 5, - 8, - 11, ... A) ƒ (x) = 3x + 4 B) ƒ (x) = 3x - 4 C) ƒ (x) = - 3x + 4 D) ƒ (x) = - 3x - 4

What is the quotient of - 27 and 5

A rectangle in Quadrant I rotates 270° counterclockwise. In which quadrant will the transformation lie?

Hera spent $16 on dinner. Then she spent $6 on dessert and some more on a taxi ride. Including the taxi fare, she spent a total of $31.

How do you write 2.2 in word form?