Question 2 :
State if the following is an equation. Identify the variable from the equations with a variable. $20 – (10 – 5) = 3 \times 5$

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1a8d78c526e972caefb5.PNG' /> In the above image, the diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (AB is a diameter of the circle; C is its centre). Express the diameter of the circle 'd' in terms of its radius 'r'.

Question 4 :
Take Sarita's present age to be 'y' years. Sarita's father's age is 5 years more than 3 times Sarita's age. What is her father's age?

Question 5 :
Does p = - 2 satisfy the equation p + 3 = 1?

Question 6 :
A bird flies 1 kilometer in one minute. Can you express the distance covered by the bird in terms of its flying time in minutes? (Use t for flying time in minutes).

Question 7 :
State if the following is an equation. Identify the variable from the equations with a variable. $\frac{3q}{2}<5$

Question 8 :
State if the following is an equation. Identify the variable from the equations with a variable. $17=x+7$

Question 10 :
A bus travels at 'v' km per hour. It is going from Daspur to Beespur. After the bus has travelled 5 hours, Beespur is still 20 km away. What is the distance from Daspur to Beespur? Express it using 'v'.

Question 13 :
State if the following is an equation. Identify the variable from the equations with a variable. $t-7>5$

Question 15 :
Give expressions for y is multiplied by - 5 and the result is added to 16.