Surds and Indices

If √3 = 1.7321, find the value of 8 / (4 + √3).

If 2^(x+4) - 2^(x+2) = 3 then x is equal to:

[(0.6)^4-(0.5)^4]/[(0.6)^2-(0.5)^2] is equal to:

If m and n are whole numbers and m^n = 196, what is the value of (m-3)^(n+1)?

3 x sqrt(5) + sqrt(125) = 17.88. What will be the value of sqrt(80) + 16 x sqrt(5)?