How to use trig functions to find the missing side of each triangle when two sides are known

Mr.geswein takes off 2 points for not showing work for each problem. james didn't show work on 6 problems.how many points did he lose?

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

Which expression will have the same sum as 3_8 + 1/4?