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The dependency ratio should be used to asses how well the labor or work force supports those who do not work in relation to other countries or regions.
You do not use a number line to find a ratio
It depends on what angle. The main angles of a rectangle are all 90 degrees and knowing that does not help. If however, the angle in question is the angle made by the diagonal with one of the sides, then it is possible to use a basic trigonometric ratio to work out the length. Details will depend on which angle is given.
what is the use and application of ratio estimator?
how do you use the substitution method for this problem 2x-3y=-2 4x+y=24