Question

rational numbers any two skill based questions with solution

Answer 1

1) find appropriate properties and find the value of -2/3x3/5+5/2-3/5x1/6
solution: -2/3 x 3/5 + 5/2 -3/5 x 1/6 = -2/3 x 3/5 -3/5 x 1/6 + 5/2 (community)
              = -3/5 (2/3 + 1/6) +5/2 (distributive)
              =-3/5 (4+1/6) +5/2
              =-3/5 x 5/6 + 5/2
              =-15/30 + 5/2
              =-1/2 + 5/2
              =4/2
              =2
              ∴ the answer is 2

2)verify that -(-x) = x for x=-13/17
  solution: x=-13/17
                -x = -(-13/17) = 13/17
                -(-x) = -(13/17)
                ∴x= -13/17