212
5
10
80
Correct answer is D
y \propto \frac{1}{x^2} \Rightarrow y = \frac{k}{x^2} \Rightarrow k = yx^2\\ k = 1\frac{1}{4} \times 4^2 \Rightarrow k=\frac{5}{4}\times \frac{16}{1}=20\\ ∴y = 20 \div \left(\frac{1}{2}\right)^2=20\times \frac{4}{1}=80
If cos x = \sqrt{\frac{a}{b}} find cosec x...
Find the derivative of the function y = 2x^2(2x - 1) at the point x = -1?...
The shadow of a pole 5√3m high is 5m. Find the angle of elevation of the sun. ...
Calculate the volume of a cuboid of length 0.76cm, breadth 2.6cm and height 0.82cm. ...
Make p the subject if formula y = a + p/a - p...
Find the equation whose roots are -\frac{2}{3} and 3...
If 7 + y = 4 (mod 8), find the least value of y, 10 \leq y \leq 30 ...
The bar chart shows the scores of some students in a test. How many students took the test? ...