Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1ceeff59b460d7261f0d8.png' /> In the above image, Mrs. Kaushik has a square plot with the measurement as shown. She wants to construct a house in the middle of the plot. A garden is developed around the house. The total cost of developing a garden around the house at the rate of 55 per $m^2$ will be ?

Question 10 :
What is the height of a cylinder whose volume is $1.54 m^3$ and diameter of the base is 140 cm ?

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cee7f59b460d7261f0ce.jpg' /> In the above image, find the height.

Question 12 :
A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal is required?

Question 13 :
The area of a rhombus whose diagonals are of lengths 10 cm and 8.2 cm is ?

Question 14 :
If each edge of a cube is doubled, how many times will its surface area increase?

Question 18 :
State true or false: For any non-zero integer a, $a^{(-m)} = 1/a^m$