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If (R(t)=b-8t) and (R(6)=42), what is (b)?
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Answer and explanation
Correct answer: 90
Given R(6)=42, substitute t=6 in R(t)=b-8t: b-8(6)=42. Thus, b-48=42, so b=42+48=90. Option 84 is incorrect because 48 has not been added back correctly to 42. Exam tip: Substitute the given value of t into a linear expression and then isolate the unknown constant.
Frequently asked questions
What is the correct answer to this question?
90
Why is this the correct answer?
Given R(6)=42, substitute t=6 in R(t)=b-8t: b-8(6)=42. Thus, b-48=42, so b=42+48=90. Option 84 is incorrect because 48 has not been added back correctly to 42. Exam tip: Substitute the given value of t into a linear expression and then isolate the unknown constant.
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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