Whole number are closed under and

Whole numbers are closed under multiplication and addition.

whole numbers are closed under ADDITION and MULTIPLICATION operations.

Step-by-step explanation:

let us denote the number of pet fish in the united states by f. it is given that 1

let us denote the number of pet reptiles in the united states by p. it is given that 2

now, to find how many pet fish and reptile pets are in the united states all together in the scientific notation, we will have to add equation 1 and equation 2. even before we do that we can see that the "order of magnitude" of f is significantly than that of p. thus, we can straightforward say that the answer will approximately be:

let us show in a detailed :

thus, the answer in scientific notation is:

answer:

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