(0.04)^-1.5 on simplification gives: 

Direction : What value should come in the place of question mark (?) in the following questions?

80% of 10% of 340 = ?

Direction : What value should come in the place of question mark (?) in the following questions?

125% of 2440 – 75% of 1856 = ?

Simplify the following equation
$$ {\sqrt{(1-sin^{2}θ) ÷{(1-cos^{2}θ)}}}$$

The value of   $$ {(0.03)^2 - (0.01)^2}\over 0.03-0.01 $$

Simplify : $$ {(7) ^{2} ÷(7^{1\over 2})^{4}}$$

If the average of 11, 23 and x is 40, then what is the value of x?

If $$ {\sqrt{1+{473\over{256}}}=1+{x\over 16}}$$ then what does x equal to ?