Two models are (A(t)=20+5t) and (B(t)=50+2t). Which value is greater at (t=7)?
Answer and explanation
Correct answer: The value of B(t) is greater
Substituting t=7 gives A(7)=20+5(7)=55 and B(7)=50+2(7)=64. Since 64 is greater than 55, the value of B(t) is greater. They are not equal because the two values are different. Exam tip: To compare linear expressions at a given value, substitute that value into both expressions first.
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What is the correct answer to this question?
The value of B(t) is greater
Why is this the correct answer?
Substituting t=7 gives A(7)=20+5(7)=55 and B(7)=50+2(7)=64. Since 64 is greater than 55, the value of B(t) is greater. They are not equal because the two values are different. Exam tip: To compare linear expressions at a given value, substitute that value into both expressions first.
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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