Class X

. If 5a = 3125, then the value of 5(a - 3) is:
  1. 25
  2. 125
  3. 625
  4. 1625
(17)3.5 x (17)? = 178
  1. . 2.29
  2. 2.75
  3. 4.25
  4. 4.5
Given that 100.48 = x, 100.70 = y and xz = y2, then the value of z is close to:
  1. 1.45
  2. . 1.88
  3. 2.9
  4. 3.7
(256)0.16 x (256)0.09 = ?
  1. 4
  2. 16
  3. 64
  4. 256.25
(0.04)-1.5 = ?
  1. 25
  2. 125
  3. 250
  4. . 625
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