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(x)=20-0.4x

Q. is the learning rate increasing? or decreasing?

can you explain why?

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