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Class 9MathematicsIntroduction to PolynomialsLinear growth and decayEasyLevel 38
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If (S(t)=10+6t), what will be the value of (S(t)) at (t=4)?

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Answer and explanation

Correct answer: 34

Given \(S(t)=10+6t\). Substituting \(t=4\), \(S(4)=10+6(4)=10+24=34\). Therefore, 34 is correct. A value such as 30 can result from incorrectly calculating \(6\times4\). Exam tip: substitute the value of the variable first, then multiply before adding.

Related tags

PolynomialsLinear ExpressionSubstitutionFunction EvaluationClass 9 Mathematics

Frequently asked questions

What is the correct answer to this question?

34

Why is this the correct answer?

Given \(S(t)=10+6t\). Substituting \(t=4\), \(S(4)=10+6(4)=10+24=34\). Therefore, 34 is correct. A value such as 30 can result from incorrectly calculating \(6\times4\). Exam tip: substitute the value of the variable first, then multiply before adding.

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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  2. 2If the amount of water is (W(t)=50-4t) litres, what type of change is it?
  3. 3In the linear rule (C(d)=15+2d), what is the initial value?
  4. 4In the linear rule (P(t)=80-5t), what is the rate of change per unit?
  5. 5If (M(t)=90-7t), what is the value of (M(t)) at (t=5)?
  6. 6Books in a library increase according to (B(n)=100+8n). What does the coefficient of (n) show?
  7. 7If water left in a tank is (L(t)=60-3t) litres, how much water was there at (t=0)?
  8. 8Which rule represents linear growth?
  9. 9Which rule represents linear decay?
  10. 10If (A(t)=12+4t), by how much will (A(t)) increase when (t) increases by (1)?
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