Question: In a study using 50 foreign-language vocabulary words, the learning rate L (in words per minute) was found to depend on the number of words

In a study using 50 foreign-language vocabulary words, the learning rate L (in words per minute) was found to depend on the number of words already learned, x, according to the equation
L = 20 - 0.4x
(a) Use the intercepts to determine a window, and then graph the equation for x0.
(b) Is the learning rate increasing or decreasing? Explain why your answer makes sense in the context of the problem.

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