列出涉及到的固定表达At each time t represented with a point on the horizontal axis the height of the graph tells us how far the car has traveled after that amount of time It’s common to name a distance function

at each time t
represented with a point on the horizontal axis
the height of the graph
tells us how far the car has traveled after that amount of time
it's common to name a distance function like this s(t)
we'd use the letter d for distance, except that it already has another full-time job in calculus
for example
after 6 seconds
the car has traveled a little more than 70 meters

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