1.
(17)3.5 × (17)? = 178

2.
$${\text{If}}\,{\kern 1pt} {\left( {\frac{a}{b}} \right)^{x - 1}} = {\left( {\frac{b}{a}} \right)^{x - 3}},$$     then the value of x is

3.
Given that 100.48 = x, 100.70 = y and xz = y2, then the value of z is close to:

4.
If 5a = 3125, then the value of 5(a - 3) is:

5.
If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:

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