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Rachel is a stunt driver, and she's escaping from a building that is about to explode! D D represents Rachel's remaining distance (in meters) as a function of time t t (in seconds). In D=−38t+220 D = -38t + 220 , what's Rachel's speed?

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Full solution

Q. Rachel is a stunt driver, and she's escaping from a building that is about to explode! D D represents Rachel's remaining distance (in meters) as a function of time t t (in seconds). In D=−38t+220 D = -38t + 220 , what's Rachel's speed?
  1. Identify equation type and terms: Identify the type of equation and what each term represents.\newlineD=−38t+220D = -38t + 220 is a linear equation where −38-38 is the coefficient of tt, representing Rachel's speed in meters per second, and 220220 is the initial distance from the building.
  2. Extract coefficient for speed: Extract the coefficient of tt to find Rachel's speed. The coefficient of tt is −38-38, which indicates the speed at which Rachel is moving away from the building.

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