Final answer:
The equivalent ratio to 7:4 is 28:16.
Step-by-step explanation:
To find an equivalent ratio to 7:4, we need to find a ratio with the same value. Let's check each option:
a. 28:16: Simplifying this ratio, we get 7:4. So, this is the correct answer.
b. 8:14: This ratio is not equivalent to 7:4.
c. 21:9: This ratio is not equivalent to 7:4.
d. 35:16: This ratio is not equivalent to 7:4.
The correct answer is a. 28:16.