Question

1. When x =2 find the value of -:
a) 2x + 5
b) 5x / 4
c) 30x +2
d) 5x - 3
e)25/3 × 6x
2. What is the cost of tiling a rectangular plot of land 150cm long and 120m wide at the rate of Rs.8 per sqm
3. Find the side of a square whose area is 169 sqm

Answer 1

Answer:

1) a) 2x + 5

= 2 x 2 + 5

= 4 + 5

= 9

b) 5x/4

= (5 x 2)/4

= 10/4

= 5/2

= 2.5

c) 30x + 2

= 30 x 2 + 2

= 60 + 2

= 62

d) 5x - 3

= 5 x 2 - 3

= 10 - 3

= 7

e) 25/3 x 6 x 2

= 25/3 X 12

= 25 x 4

= 100

2) cost of tiling the plot = area x 8

= l x b x 8

= 150 x 120 x 8

= 18000 x 8

= ₹144000

3) area of square = s²

169 = s²

s = √169

s = 14 m

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