64.
A. Sid would not be correct because he has not taken the 10 away like tina has done
B.Tina is correct for the reasons above
C. Jamal is incorrect for the same reasons sid is and that he added one instead of five
65: 2.40(m-2)+3.00= t
66. 6.50 x t - 750 = p
67. 50h+50= t