How many cars were washed on friday and saturday combined

What is the slope of the equation y =

Need plz been trying to do it for a long time and still haven’t succeeded

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.