The number of vocabulary is a function of the child's age. The formula for the size of vocabularies for typical children between the ages 20 months and 50 months is given by n= 60a - 900 , where a represents the child's age in months and n represents the number of words that the child uses correctly. How many words does a typical child learn each month from age 20 months to age 50 months? Select one: a. 50 words/month b. 60 words/month c. 70 words/month d. 80 words/month

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