Answer:
A, B, C, E, F
Explanation:
Integers are numbers that can be written in decimal without a fractional part. 7 is an integer. (A)
Real numbers are numbers that do not have an imaginary part. 7 is a real number. (B)
Natural numbers are the numbers we count with. They are positive numbers. 7 is a natural number. (C)
Irrational numbers are numbers that cannot be expressed as the ratio of two integers. Written in decimal, they have an infinite-length, non-repeating decimal fraction. 7 is not irrational.
Rational numbers are numbers that can be expressed as the ratio of two integers. 7 = 7/1 is a rational number. (E)
Whole numbers are non-negative integers. They are all the natural numbers together with zero. 7 is a whole number. (F)