Final answer:
To express the fractions (18)/(4) and (21)/(5) as mixed numbers, divide the numerator by the denominator. The simplified mixed numbers are 4 and (2)/(4) and 4 and (1)/(5).
Step-by-step explanation:
To express the fractions (18)/(4) and (21)/(5) as mixed numbers, we need to divide the numerator by the denominator.
For (18)/(4), 18 divided by 4 equals 4 remainder 2. Therefore, the mixed number is 4 and (2)/(4).
For (21)/(5), 21 divided by 5 equals 4 remainder 1. Therefore, the mixed number is 4 and (1)/(5).
To simplify the mixed numbers, we can reduce the fractions if there are common factors between the numerator and denominator. In this case, there are no common factors, so the simplest forms of the mixed numbers are 4 and (2)/(4) and 4 and (1)/(5).