If (L(t)=13+4t), what is the value of (L(7)-L(3))?
Answer and explanation
Correct answer: 16
Given L(t)=13+4t, L(7)=13+4(7)=41 and L(3)=13+4(3)=25. Therefore, L(7)-L(3)=41-25=16. Option 28 may result from confusing the value at 7 with the required difference, but the question asks for the difference of two function values. Exam tip: For a linear expression a+bt, L(x)-L(y)=b(x-y).
Frequently asked questions
What is the correct answer to this question?
16
Why is this the correct answer?
Given L(t)=13+4t, L(7)=13+4(7)=41 and L(3)=13+4(3)=25. Therefore, L(7)-L(3)=41-25=16. Option 28 may result from confusing the value at 7 with the required difference, but the question asks for the difference of two function values. Exam tip: For a linear expression a+bt, L(x)-L(y)=b(x-y).
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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