standard_description: Use data from a random sample to draw inferences about a population with an unknown characteristic of interest. Generate multiple samples (or simulated samples) of the same size to gauge the variation in estimates or predictions. For example, estimate the mean word length in a book by randomly sampling words from the book; predict the winner of a school election based on randomly sampled survey data. Gauge how far off the estimate or prediction might be.
problem_activity: Task
The graphs below show the distance two cars have traveled along the freeway over a period of several seconds. Car A is traveling 30 meters per second.
[IMG]
Which equation from those shown below is the best choice for describing the distance traveled by car B after $x$ seconds? Explain.
$y = 85x$
$y = 60x$
$y = 30x$
$y = 15x$


aligns: no