What is the area of the triangle when b=3.5 and h=3? B is the base and h is the height

In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up determine the theoretical and experimental probability of getting a heads up in the experiment.

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

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth