Answer:
D.
Step-by-step explanation:
It just is hard to explain but I had the same question.
Divide by 3 to get the rate per min
She types 54 words per minute
<span><span>D. Allow him or her to view data as an easy to understand image that might be recognized as a pattern and solved without costly data analysis.</span></span>
Because y varies inversely as x, therefore

where k = constant.
When x = 6, y = 2.5. Ther efore

Cross multiply.
k = 6 x 2.5 = 15
The equation is

When x = 4, obtain

Answer: a. 3.75