Is a biased sample (always, sometimes, or never true) valid and why?

Determine the fraction of total interest owed. after the fourth month of a 12-month loan: the numerator is: {(n + ) + (n + ) + (n + ) + (n + )} = , and the denominator is: {(n) + (n + 1) + + (n + )} = . therefore, the fraction is numerator/denominator (to the nearest tenth) =

Evaluate cos2θ for cosθ = square root of 3/2

Need showing work for this problem 56.25 ×25.80