Describe the difference between Western Europe and Eastern Europe after WW II

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Ascatterplot is produced to compare the size of a school building to the number of students at that school who play an instrument. there are 12 data points, each representing a different school. the points are widely dispersed on the scatterplot without a pattern of grouping. which statement could be true

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).