Question

31) If a = 2, b = -2, find the value of
(i) 2 + 2 (ii) 2 + ab + 2 (iii) 2 - 2.
32) If m = 2. Find the value of
(i) m – 2 (ii) 3m – 5 (iii) 32 - 2m – 7.
33) Simplify 23 34 43 32
34) Simplify 3 X 72 1121 X 113.
VI. Long answer questions: (6 x 4 = 24)
35) List five rational numbers between 12 and 23.
36) Write four more rational numbers −35 , −610 , −915,…………
37) a). The adjoining figure represents a rectangular lawn with a circular flower bed in the
middle. If radius of the circle is 2 m, length of rectangle is 10 m and breath is 5 m
5 m
10 m
Find: (i) the area of the whole land (ii) the area of the flower bed
(iii) the area of the lawn excluding the area of the flower bed
(iv) the circumference of the flower bed.
(OR)
2m
b). A path 1 m wide is built along the border and inside a square garden of side 30 m. Find:
(i) the area of the path
(ii) the cost of planting grass in the remaining portion of the garden at the rate of
40 per m2.
38) From the sum of 3x - y + 11 and - y -11, subtract 3x - y - 11.
(OR)
Find the sum of 4+3 and 5- 4x + 22 , subtract the sum of 32- 5x and 2 + 2x + 5
39) Express each the following numbers using exponential notations
(i) 512 (ii) 3125.
40) What letters of the English alphabet has reflection symmetry?
a) A vertical mirror.
b) A horizontal mirror.
c) Both horizontal and vertical mirror.
d) A quadrilateral has _____ lines of symmetry.

Answer 1

31)

(i) 2 + 2 = 4

This is the correct answer of your question.