Answer:
1, -2 and -25 are integers
Explanation:
Integers are defined as whole numbers (no decimals or fractions are included).
Integers include:
set of positive numbers {1,2,3,4,.....etc}
zero {0}
set of negative numbers {-1,-2,-3,-4,....etc}
Now, applying this to the given choices, we will find that the only three whole numbers are 1, -2 and -25. Therefore, these are the only integers.
As for other choices:
2 2/5 is a mixed number (has a fraction), therefore, not an integer
6.78 is a decimal, therefore, not an integer
Hope this helps :)
