Solve the quadratic equation by using either a numeric or a graphic approach. x squared + 2 x minus 3 = 0
a.
x = -1.1 or x = -2
c.
x = 2 or x = -5
b.
x = 2.3 or x = -0.82
d.
x = 1 or 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.