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If a plant grows by (2) cm each day and starts at (10) cm, which rule represents it?

Answer and explanation

Correct answer: \(h(d)=10+2d\)

At the start, that is, when \(d=0\), the plant’s height is \(10\) cm. Since it increases by \(2\) cm per day, its height after \(d\) days is \(h(d)=10+2d\). Option B represents a decrease in height, so it does not model growth. Exam tip: in a linear rule, the constant term is the initial value and the coefficient of \(d\) is the change per day.

Related tags

Linear GrowthLinear EquationsPolynomialsWord ProblemsMathematical ModellingLinear Growth And DecayIntroduction To PolynomialsMathematics

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