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!
3 x 8 = 24
3 x -2 = -6
reply if you this was wrong or you needed a different answer pls >:(
3 because the 2z minus the 3 gives you 1 rounded