math
posted by Cliff .
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.

First write the problem.
4 < x^(1/2) < 9
Square each term. There are no negative signs, so the inequality signs will not change.
Squaring...
16 < x < 81