3. How does the author develop his central idea over
the course of the article?

The distance d that a car can travel in a certain amount of time t can be found by multiplying the rate of speed r by the travel time. if a car has already travel 4 miles, the formula for the total distance travel is d= rt + 4. which of the following gives the value of r, in terms of d and t?

Kuhl found that babys brains are most open to learning the consonants in their native language at what age? and vowels at what age?

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