The ratio is 0.394 cm. / 1 in.
C. 10r-3
Because 2r+5=7, the minus 6 and 7 which gives you 1 then minus 4 and 1 witch is 3 then you do 10r-3 and it will get you to 2r+5=7 again. I hope this helped!
2 · 7.5 + 2 · 11 = 15 + 22 = 37
5/6 times 3/1= 15/6 so that will be your answer
