The value of maggie's car decreased by 10% since last year, when she bought it. if the car is now worth $17,000.00, how much was the car worth when she bought it?
a.
$20,000.00
b.
$18,700.00
c.
$18,888.89
d.
$17,894.74

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.