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Subjects
Class 9MathematicsIntroduction to PolynomialsLinear growth and decayEasyLevel 40
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If (U(t)=9t+14), what is (U(t)) at (t=7)?

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Answer and explanation

Correct answer: 77

Given U(t)=9t+14, substitute t=7: U(7)=9×7+14=63+14=77. Hence, 77 is the correct option. The value 63 is only 9×7 and does not include the constant term 14. Exam tip: To evaluate a function, substitute the given input first and then follow the order of operations.

Related tags

PolynomialsLinear ExpressionFunction EvaluationSubstitutionLinear Growth

Frequently asked questions

What is the correct answer to this question?

77

Why is this the correct answer?

Given U(t)=9t+14, substitute t=7: U(7)=9×7+14=63+14=77. Hence, 77 is the correct option. The value 63 is only 9×7 and does not include the constant term 14. Exam tip: To evaluate a function, substitute the given input first and then follow the order of operations.

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 (S(t)=10+6t), what will be the value of (S(t)) at (t=4)?
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  8. 8If water left in a tank is (L(t)=60-3t) litres, how much water was there at (t=0)?
  9. 9Which rule represents linear growth?
  10. 10Which rule represents linear decay?
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