Chapter 2
Introduction to Linear Polynomials
CBSE Class 9
Mathematics Solutions
Educart Mathematics class Class 9 NCERT Exemplar cover
Question:

What will be the height of the water at the end of 5 months (Refer to Example 10 on NCERT page no. 24)?                                                                                                                                                                                                                                   [Page No. 25]

Answer: Verified

The height function is h(t)=3−0.5th(t) = 3 - 0.5t.

For t=5t = 5:

3−0.5×5=3−2.5=0.5 m.3 - 0.5 \times 5 = 3 - 2.5 = 0.5 \text{ m}.

So, after 5 months the water height is 0.5 m. Because the height falls by a fixed 0.5 m each month, this is linear decay.

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More NCERT Questions
What is the cost of travelling 15 km? For how many km will the cost be ₹ 700 (Refer to Example 9 on NCERT page no. 24)? [Page No. 24] Differentiate between the graphs of the equations y = 3x + 1, and y = -3x + 1. [Page No. 33] Identify other points on the line by completing the following table. [Page No. 28] x 1 2 5 7 9 12 20 y 3 15 Can you guess what the numbers 20 and 150 in the equation y = 20x + 150 represent (Refer to Example 11 on NCERT page no. 26)? [Page No. 27]