Suppose that a travel bureau claims that the trees in a forest
are 83 feet tall on average, with a standard deviation of 2 feet.
If you took a sample of 64 trees, which of the following mean
heights would be outside the 95% confidence interval?

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

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

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.