Find 80 cm = ----- m

Find: 80cm =____m.

From a rectangular sheet of dimension 30 cm xx 80 cm , four equal squares of side x cm. are removed at the corners, and the sieds are then turned up so as to form an open rectangular box. Find the value of x, so that the volume of the box is the greatest.

The pressure of a gas in a vessel is 80 cm of Hg. Now 25% of the same gas is also introduced into the same vessel. If the process is done at the same temperature, find the final pressure of the gas.

An object 3 cm high is placed at a distance of 15 cm from a concave mirror, the radius curvature is 20 cm. Find the nautre, position and size of the image. (v = - 30 cm, m = - 2, h_2 = - 6 cm )

The far point of a myopic person is 80 cm in front of the eye . What is the natuure and power of the lens required to correct the defect ?

Find the area of the rectangles with the given sides: 50 cm and 20 cm