Free points but tell me what you did today or what time it is

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

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. find the probability that it takes at least 8 minutes to find a parking space. (round your answer to four decimal places.)