Write opposites of the following : (e) 100 m above sea level

Write opposites of the following : (c ) 80 m east

Write opposites of the following : (b) 30 km north

Write opposites of the following : (d) Loss of ₹ 700

Write opposites of the following : (a) Increase in weight

Write each of the following as decimals: (e) 88/10

A person on the lighhouse of height 100 m above the sea level observes that the angle of depression of a ship sailing towards the light house changes from 30^(@) to 45^(@) . Calculate the distance travelled by the ship during the period of observation. ( Take sqrt(3)~~1.73 )

As observed from the top of a lighthouse 100 m high abov e sea level, the an g les o f d ep ression o f a ship, sailing directly tow ards it, changes from 30^(@) to 60^(@) . Find the distance travelled by the ship during the period of observation.

Write each of the following as decimals. (b)137+5/100

A plane is flying at the height of 5000m above the sea level. At a particular point, it is exactly above a submarine floating 1200m below the sea level. When is the vertical distance between them?

An observer on the top of a cliff 200 m above the sea level, observes the angles of depression of two ships on opposite sides of the cliff to be 45^(@) and 30^(@) respectively. Then the distance between the ships if the line joining the points to the base of the cliff