Yes, your answer for question 4 is incorrect. Here's how to correctly simplify the expression:
To simplify a fraction divided by another fraction, you can multiply the first fraction by the reciprocal of the second fraction.
So, we have:
(6/8) / (2/18)
To find the reciprocal of a fraction, we simply switch the numerator and denominator. So, the reciprocal of 2/18 is 18/2.
Now, we can multiply the first fraction by the reciprocal:
(6/8) * (18/2)
When multiplying fractions, we multiply the numerators together and the denominators together. So, we have:
(6 * 18) / (8 * 2)
Simplifying further, we get:
108 / 16
To simplify, we can divide both numerator and denominator by their greatest common divisor. In this case, the greatest common divisor of 108 and 16 is 4.
Dividing 108 by 4 gives us 27, and dividing 16 by 4 gives us 4.
So, the simplified form of (6/8) / (2/18) is 27/4.
Therefore, your answer should be 27/4, or you can also express it as a mixed number, 6 3/4.