What type of number can be written as a fraction p/q where p and q are integers and q is not equal to zero

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

Find the inverse of the given function. f(x)= -1/2sqr x+3, x greater than or equal to -3

Concerned about campus safety, college officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. how many randomly selected students must be surveyed in order to be 95 % confident that the sample percentage has a margin of error of two percentage points?