Can you please help me with this last math problem will mark brainlest
and Photomath does not know the answer to this problem.​

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.

3x^2 + 64 = 2x^2/2 find the roots of the quadratic equation

If f(x) = 5x + 40, what is f\x) when x = -5? -9 -8 7 15