True or false

the figure below is the graph of the dimensions of a rectangle whose adjacent side lengths exhibit direct variation.

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

In a column proof the right column states your reasons