Correct Answer: C

Rationale: A composite number is a positive integer greater than one that has more than two factors.
Choice A is incorrect because a number with only two factors is a prime number.
Choice B is incorrect as being a fraction does not define a composite number.
Choice D is incorrect because a number with exactly two factors is a prime number, not a composite number.

Correct Answer: A

Rationale:
To find the expression representing the length of the rectangle in terms of x, we need to consider that the length is six less than two times the width. If we denote the width as x, the length can be expressed as 2x - 6.
Therefore, the correct expression is 2x-6 (choice
A).
Choice B, 6-2x, represents the width subtracted from 6, not the length.
Choice C, 6x-2, is not derived from the given information about the relationship between the width and length.
Choice D, 3x-4, is not consistent with the relationship provided in the question.

Correct Answer: A

Rationale: A quotient is the result of dividing one number by another.
Choice A is correct because it accurately defines a quotient as the outcome of a division operation.
Choice B is incorrect because it describes the result of multiplying two numbers, not dividing them.
Choice C is incorrect because it refers to the remainder of a subtraction operation, not a division.
Choice D is incorrect because it mentions the number remaining after a division, which is typically referred to as the remainder and not the quotient.

Correct Answer: A

Rationale:
To convert pounds to kg, you need to divide by 2.2, not multiply. Similarly, to convert kg to pounds, you should multiply by 2.2.
Therefore, choice A is correct.

Choices B, C, and D are incorrect because they provide incorrect conversion factors for pounds and kg, leading to inaccurate results.

Correct Answer: C

Rationale: The correct answer is C: 'As elevation increases, temperature decreases.' In a negative correlation, the variables move in opposite directions. As elevation rises, temperature tends to decrease.
Choice A is incorrect because a negative correlation implies that as one variable increases, the other decreases.

Choices B and D are incorrect because they suggest that temperature either remains the same or increases as elevation decreases or increases, which is inconsistent with a negative correlation.