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Answer

↓Steps Explained:↓

Determine numeric characteristics for 15

Natural Number Test

Counting numbers > 0: 1,2,3,4,5,...

Since 15 is positive and a counting number, 15 is a natural number

Whole Number Test

Whole Numbers are positive numbers

They include 0

They have no decimal or fractional parts

Since 15 >= 0 and it is an integer, 15 is a whole number

Integer Test

Integers have no fractions or decimals

-5,-4,-3,-2,-1,0,1,2,3,4,5,...

15 is an integer

Rational Number Test

Check for integer or decimal

Rationals = a/b

where a and b are integers<

and b ≠ 0.

Since 15 is an integer or decimal from above, 15 is also a rational

Irational Number Test

They do not form a ratio between two integers

They are not an imaginary number.

Imaginary Number Test

Test for square root of a negative

Since 15 is not the square root of a negative number, it is not imaginary

Final Answer

• Natural
• Whole
• Integer
• Rational