Question

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Answer 1

Step-by-step explanation:

27. a 4 b 4

28. 4÷ 9 ÷ -4 ÷ 9

cross multiplication

4÷ 9×- 9÷ 4 = -1

29 .53÷ 16 = 3.3125

30. s- t

b . x× x

31. 4lb+8lb - 31+ -20

12lb-51

Answer 2

Answer:

Step-by-step explanation:

28. 4/9 ÷ -4/9

   = 4/9 * -9/4

   = -1

29. 53/16 in decimal form =3.31

30.a.  s - t

     b. x*x = x square

31. -16 lb+8b− 31