Given that cos(θ)= -√3/4 and tan(θ) > 0, find sin(θ)

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

What are two numbers that have a sum of 15

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.