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Saying that 4<(sq.root of x)<9 is equivalent to saying what about x ?

a. 0<x<5
b. 0<x<65
c. 2<x<3
d. 4<x<9
e. 16<x<81

Please help.
Does this problem relate to 'x'values on the xy coordinate system ? If so please explain the concept here.

If not please explain this problem anyway.

A million thank yous.

  • math -

    First write the problem.
    4 < x^(1/2) < 9
    Square each term. There are no negative signs, so the inequality signs will not change.

    16 < x < 81

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