14m
10m
7m
5m
Correct answer is C
Volume of a cylinder = \( \pi r^2\)h
385 = \(\frac{22}{7}\) x \(r^2\) x 10
385 x 7 = 22 x \(r^2\) x 10
\(r^2\) = \(\frac{385 \times 7}{22 \times 10}\)
= 12.25
r = \(\sqrt{12.25}\)
= 3.5m
Hence, diameter of tank = 2r
= 2 x 3.5 = 7m
Simplify \(\frac{3^{-5n}}{9^{1-n}} \times 27^{n + 1}\)...
If 2x + y = 7 and 3x - 2y = 3, by how much is 7x greater than 10? ...
Find the equation of a line which is form origin and passes through the point (−3, −4) ...
If y = x sinx, find \(\frac{dy}{dx}\)...
A point X is on the bearing 342° from a point Y. What is the bearing of Y from X? ...
Find the values of p and q such that (x - 1)and (x - 3) are factors of px3 + qx2 + 11x - 6 ...
Express 2.7864 x 10-3 to 2 significant figures...
Simplify \(\frac{2.25}{0.015}\) leaving your answer in standard form...