If (U(t)=5t+15), what is (U(t)) at (t=7)?
Answer and explanation
Correct answer: 50
Given \(U(t)=5t+15\). Substituting \(t=7\), \(U(7)=5\times7+15=35+15=50\). Therefore, 50 is correct. Getting 45 is incorrect because adding 15 to \(5\times7=35\) gives 50. Exam tip: To find a function value, substitute the given number for the variable, then follow the order of operations.
Frequently asked questions
What is the correct answer to this question?
50
Why is this the correct answer?
Given \(U(t)=5t+15\). Substituting \(t=7\), \(U(7)=5\times7+15=35+15=50\). Therefore, 50 is correct. Getting 45 is incorrect because adding 15 to \(5\times7=35\) gives 50. Exam tip: To find a function value, substitute the given number for the variable, 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.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
