A rational number is defined as any number that can be expressed as the quotient or fraction of two integers (where the denominator is not zero).
Let's evaluate the responses:
- 7 - This is a whole number and can be expressed as \( \frac{7}{1} \), so it is rational.
- √7 - This is an irrational number because it cannot be expressed as a fraction of two integers.
- π (pi) - This is also an irrational number.
- 88√ - This appears incomplete. If it means 88 times the square root of some number, it is difficult to determine without further context.
- The fraction with numerator 8 and denominator √8 - The denominator √8 is irrational (approximately 2.828), so this entire fraction is also irrational.
- 7.8 - This is a decimal that can be expressed as \( \frac{78}{10} \) or simplified to \( \frac{39}{5} \), making it a rational number.
Among the options provided, both 7 and 7.8 are rational numbers.
So, the correct rational number choices are:
- 7
- 7.8
If you need only one answer, either 7 or 7.8 would be correct.