s = 40 + 2t 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 3 seconds after it began to accelerate?

The equation gives the speed s, in miles per hour, of a certain car t seconds after it... | SAT Linear equations in two variables Practice

Answer: D. $46$

Explanation:1. Given Equation: $s = 40 + 2t$ This equation gives the speed ( $s$ ), in miles per hour, of a certain car $t$ seconds after it began to accelerate.

Information Provided: We need to find the speed of the car $3$ seconds after it began to accelerate. This means $t = 3$ seconds.
Calculate the Speed (s): Substitute $t = 3$ into the given equation: $s = 40 + 2(3)$ $s = 40 + 6$ $s = 46$
Units for Speed: The problem states that the speed $s$ is in miles per hour. So, the speed is $46$ miles per hour.
Compare with Options: [A] $40$ [B] $42$ [C] $43$ [D] $46$ - This matches our calculation.
Conclusion: The speed of the car $3$ seconds after it began to accelerate is $46$ miles per hour.

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SAT Linear equations in two variables practice question

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