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Answer 1

1 :  a) Inequation , value of variables(m&n here) cann't be determined

    b) Equation , value of variable(p here) can be determined

2 :  a) Two variable (x and y here)

     b) Three variable (x,y,z here)

     c) One variable (x here)

     d) It is not linear , it is a quadratic equation (power = 2)

3 :  a) Three times x multiplied by eight times y gives 22

     b) 7 subtracted from y gives 10

4 :  a) No

          2(4) + 7 = 8 + 7 = 15 ≠ 19

     b) Yes

         left = 3(4) - 4 = 12 - 4 = 8

         right = (4) + 4 = 4 + 4 = 8

5 : Let Rohan's age is 'r' , then Rohan's mother age = 4 + 4r

    also Rohan's mother age = 36 years : given

       so, 4 + 4r = 36

                  4r = 36 - 4 = 32

                  r = 32/4 = 8

Rohan is 8 years old.