If a = -1, b = 2, and c = 3, then a + 4b + 2c is equal to:
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<em><u>Question:</u></em>
If y varies inversely with the square of r, what is the constant of proportionality when y =10 and r = 5?
<em><u>Answer:</u></em>
The constant of proportionality is 250
<em><u>Solution:</u></em>
Given that,
y varies inversely with the square of r
Which means,
Where, "k" is constant of proportionality
Subtitute y = 10 and r = 5
Thus the constant of proportionality is 250