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Algebra / Linear functions Difficulty: Easy

$s = 40 + 3 t$

The equation gives the speed $s$ , in miles per hour, of a certain car $t$ seconds after it began to accelerate. What is the speed, in miles per hour, of the car $5$ seconds after it began to accelerate?

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Explanation

Choice D is correct. In the given equation, $s$ is the speed, in miles per hour, of a certain car $t$ seconds after it began to accelerate. Therefore, the speed of the car, in miles per hour, $5$ seconds after it began to accelerate can be found by substituting $5$ for $t$ in the given equation, which yields $s = 40 + 3 (5)$ , or $s equals 55$ . Thus, the speed of the car $5$ seconds after it began to accelerate is $55$ miles per hour.

Choice A is incorrect and may result from conceptual or calculation errors.

Choice B is incorrect and may result from conceptual or calculation errors.

Choice C is incorrect and may result from conceptual or calculation errors.