Question

ne of a cube whose side is 15%
a) 225x3
b) 625x
c) 3375x
d) 1229
30. On expressing 5x 10-5 in usual form, we get
b) 0.005 c) 0.00005
a)
5
105
d) (5x 10)-5
SECTION -B
ANSWER THE FOLLOWING: ( 7 X 2 = 14)
31. Simplify : [4-1 - 3-1)-2
32. Multiply: (2x2 + 3y2) by ( 5x2 - y2)
33. Solve and verify:
5x
= x - 2
34. Find the rate of discount when M.P = * 600 an
S.P= 510.​

Answer 1

Answer:

Ans 31. Simplify

Simplify [4-1 - 3-1)-2

Correct option is

144

1

Ans 32. Multiply:

(2x2 + 3y2) by ( 5x2 - y2)

= 40+40y^2

Ans 34 Find the rate of discount when M.P = * 600 an S.P= 510.

= Rs 600 and S.P. = Rs 510. Therefore, Rate of discount, i.e., discount% = \frac{Discount}{M.P.} x 100 = \frac{90}{600} x 100% = 15%.