Tom's red bicycle travels 50ft for every 3 pedal turns. how many pedal turns are needed to travel a mile

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

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.

Is (0,0) a to ? ys x2 - 4 y> 2x-1