To which set or sets does the number -18 belong

-18 belongs to the set of integers.

Step-by-step explanation:

The set of Integers is { -3, -2, -1 , 0, 1,2,3}.

This set consists of 0, the whole numbers (positive) and their opposite negative numbers.

I hope this helps.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

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step-by-step explanation: