Which city was ranked as the costliest city for

A regular hexagon is inscribed in a circle of radius 10 cm. Find the perimeter of the hexagon.

? = (597.98 ÷ (6.97 ^2.01 – 3.1)) × 12.9

?, 241, 308, 395, 506, 645

The ratio of zinc and copper in a brass pieces is 2:5. How much zinc will be there in 140 kg of such a piece?

Find the area enclosed between the curves y=(x−4)² and y=16−x²over their intersection interval.

A sum of money becomes ₹5,600 in 4 years and ₹6,400 in 8 years at simple interest. Find the rate of interest per annum.

What is the mean of the following data given below:

3,7,9,5,11,13,8,12,15,12,4