A helicopter, initially hovering 40 feet above the ground, begins to gain altitude at a rate of 21 feet per second. Which of the following functions represents the helicopter's altitude above the ground y, in feet, t seconds after the helicopter begins to gain altitude?
Source: Questions from the AGIEval benchmark's SAT subsets, derived from pre-2016 College Board SAT exams.
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These items follow the pre-2016 paper SAT format and do not reflect the current digital SAT. Useful as a benchmark set, not as current test preparation.
id agieval_sat:747ee49e50bc01bd216ceb464ba19a58
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