Final answer:
The ratios 48/36 and 56/42 form a proportion.
Step-by-step explanation:
To determine if the ratios 48/36 and 56/42 form a proportion, we need to set up a proportion by setting the two ratios equal to each other.
48/36 = 56/42
To simplify the ratios, we can reduce them to their simplest form:
48/36 = 4/3
56/42 = 4/3
Since the simplified ratios are equal, the two ratios form a proportion. Therefore, the answer is a. true.