Final answer:
From the set of numbers (10, 1.25, -2), the numbers classified as integers are 10 and -2, which makes option a) the correct answer.
Step-by-step explanation:
The student has provided a set of numbers (10, 1.25, -2) and asks which of them are classified as integers. An integer is any number that is not a fraction or decimal, and it can be positive, negative, or zero. Looking at the options provided:
Option a) 10 and -2 are both integers.
Option b) 10 and 2 are not both in the set (2 is not listed).
Option c) -2 is an integer, but -1.25 is not in the set and is also not an integer.
Option d) -2 is an integer, but 1.25 is not since it's a decimal.
Therefore, the correct answer is a) 10 and -2 only.