Which of the following results in a sum or a product that is rational choose all that apply

3.12 x 1.4
√9 x √25
√2 x √3
4 + 5
n x 3

Molli purchased 9 apples for $3.96 molli divided $3.97 by 9 why my molli perform this calculation

in order to find out how much she paid per apple
in order to find the total number of apples purchased
in order to calculate the total amount that she owes
in order to calculate how much money she has left

For the second one it is d. In order to find out how much she paid per apple.

1 idk

2 d

The following results in a sum or a product that is rational:

4 + 5

Molli performed the calculation of dividing $3.97 by 9 in order to find out how much she paid per apple.

To determine which of the given expressions result in a sum or product that is rational, we need to understand what makes a number rational. A rational number is any number that can be expressed as a fraction of two integers, where the denominator is not zero.

Let's analyze each expression:

1. 3.12 x 1.4:
To decide whether the product is rational, we multiply 3.12 by 1.4. The result, 4.368, is not a rational number because it cannot be expressed as a fraction of two integers.

2. √9 x √25:
The square root of 9 is 3, and the square root of 25 is 5. Multiplying 3 by 5 results in 15, which is a rational number.

3. √2 x √3:
Both √2 and √3 are irrational numbers. When we multiply them together, the result (√2 x √3) is also irrational.

4. 4 + 5:
Adding 4 and 5 equals 9, which is a rational number since it can be expressed as 9/1.

5. n x 3:
In this expression, "n" represents a variable. To determine if the product is rational, we need more information about the value of "n." Depending on the value of "n," the product may or may not be rational.

Now let's discuss why Molli performed the calculation of dividing $3.97 by 9.

Molli divided $3.97 by 9 in order to find out how much she paid per apple. By dividing the total amount she spent ($3.97) by the number of apples she purchased (9), she can calculate the price per apple. This division will give her the value of $0.4411 per apple.

Therefore, the reason why Molli performed this calculation was to find out the price per apple.