In which set does -15/2 belong to? 1) rational numbers 2)integers 3)whole numbers 4) all of the above

A rational number is any number that is or can be turned into a fraction...it includes both negative and positive numbers.
an integer is a whole numberboth negative and positive
a whole number ...well...its a whole number but only a positive one

-15/2 = - 7 1/2...this is not a whole number

so ur answer is : rational number

3cm and 6 and 9 cm that a possibility of that question