Final answer:
Both option a (70) and option b (the temperature change resulting in a whole number) are integers. Options c and d are not integers as they contain decimal components.
Step-by-step explanation:
The question is asking which of the presented options is an integer. An integer is a whole number that can be positive, negative, or zero, but cannot be a fraction or decimal. Let's evaluate each option:
- a. 70: This is an integer, as it is a whole number with no fractional or decimal component.
- b. The temperature after there was a 5º increase, a 7º increase, and a 6° decrease: To find if the result is an integer, we perform the arithmetic operations: 5 + 7 - 6, which equals 6, also an integer.
- c. The number halfway between 9 and 10: This is 9.5, which is not an integer because it is a decimal number.
- d. The money you still have if you started with $300.00 and you lent a friend $125.50: To find this, subtract $125.50 from $300.00 to get $174.50. This is not an integer because, again, it has a decimal component.
Therefore, both option a, which is 70, and option b, the calculated temperature change, are integers.