a salesperson is paid $400 per week, plus 10% of the total value of the sales she makes for the week. let s  represent the total value of the sales. which expression represents the amount of money the salesperson is paid in a week? a. 0.1(400s) b. 400 + 0.1s c. 0.1 + 400s d. 0.1(400 + s)

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.