Convert. if necessary, round to the nearest tenth. (recall: 1 in. = 2.54 cm) 16 cm . a. 4.5 c. 8.5 b. 6.3 d. 6.9

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

Plzzz answer both questions and i will give you 100 points

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.