Question 4 Answer & Explanation - SAT Algebra

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A phone plan costs $40 plus $0.10 per text. If the bill was $55, how many texts were sent?

$150$

$15$

$550$

$100$

Correct Answer: A

Choice A is the correct answer. Solve for x.

Model: $C = 0.10x + 40$ .
Substitute: $55 = 0.10x + 40$ .
Subtract 40: $15 = 0.10x$ .
Divide: $x = 15 / 0.10 = 150$ .

💡 Strategic Tip: Subtract the fixed cost first, then divide by the rate.

Choice B is incorrect because calculation error. Choice C is incorrect because didn't subtract 40. Choice D is incorrect.

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