In a mobile data plan, data is (D(d)=2+1.5d) GB. What will be the total data at (d=4)?
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Answer and explanation
Correct answer: 8 GB
Substitute d=4: D(4)=2+1.5×4=2+6=8 GB. Therefore, 8 GB is correct. 7.5 GB accounts only for 1.5×4 and misses the initial 2 GB. Exam tip: after substitution in a linear expression, multiply first and then add.
Frequently asked questions
What is the correct answer to this question?
8 GB
Why is this the correct answer?
Substitute d=4: D(4)=2+1.5×4=2+6=8 GB. Therefore, 8 GB is correct. 7.5 GB accounts only for 1.5×4 and misses the initial 2 GB. Exam tip: after substitution in a linear expression, multiply first and then add.
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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