I think ur right but do u know for sure

Acertain standardized? test's math scores have a? bell-shaped distribution with a mean of 520 and a standard deviation of 105. complete parts? (a) through? (c)

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

Indicate the formula for the following conditions: p^c(n, r)=