Please help asap :))

Will gve pints stars and brainliest

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

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.