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If (A(t)=a+4t) and (A(3)=32), what is (a)?
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Answer and explanation
Correct answer: 20
Given A(t)=a+4t and A(3)=32, substitute t=3: a+4×3=32. Thus, a+12=32, so a=20. If a were 24, then A(3)=24+12=36, not the given value 32. Exam tip: when a function value is given, substitute the corresponding value of t directly into the function.
Frequently asked questions
What is the correct answer to this question?
20
Why is this the correct answer?
Given A(t)=a+4t and A(3)=32, substitute t=3: a+4×3=32. Thus, a+12=32, so a=20. If a were 24, then A(3)=24+12=36, not the given value 32. Exam tip: when a function value is given, substitute the corresponding value of t directly into the function.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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