The cost of 2kg of apples and 1 kg of grapes on a day was found to be Rs. 160. After a month, the cost of 4kg of apples and 2kg of grapes is Rs. 300. Represent the situation algebraically and geometrically.

The each of a cricket team buys 3 bats and 6 balls for Rs. 3900. Later, she buys another bat and 3 more balls of the same kind for Rs. 1300. Represent this situation algebraically and geometrically.

Given two natural numbers, seven times the smaller number exceeds three times the greater number by 1. Five times the smaller number exceeds twice the greater number by 2. Represent this data algebraically and geometrically.

Write down all the subsets of the following sets {a,b}

Write down all the subsets of the following sets phi

Write down all the subsets of the following sets {a}

Observe your surroundings carefully and write any three situations of your daily life where you can observe lines and angles. Draw the pictures in your note book and collect some pictures.

Write the equation involved in the Kolbe's reaction

Write general characteristics of equilibria involving physical processes.

Write down the reactions involved during the formation of photochemical smog.