She needs 4 packs and she will then have a spare 3
4x^3+6x^2-9x+1 is an example
In order for the whole expression to be negative, either (x⁵)
or (y⁴) or (z²) must be negative.
But an even-numbered power can't be negative ... even if the base
is a negative number, any even-numbered power of it is positive.
So (y⁴) and (z²) are always positive. The expression can be
negative if 'x' is negative, because (x⁵) will then be negative.
None of the proposed requirements is appropriate, so the
final answer is E. None .
4x+25=6x-13
25=2x-13
38=2x
19=x
The number is 19
