The answer is d because the x value does not repeat. Hopes this helps.
Answer:
11/12
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First off, let's convert the percentages to decimal format, so our 77% turns to 77/100 or 0.77, and our 55% turns to 55/100 or 0.55 and so on
now, the sum of both salines, must add up to the 77% mixture, let's say is "y"
so, 11 + 4 = y, and whatever the concentration level is, must also sum up to the mixture's concentration of 77%
anyway thus

solve for "x"
The vertex form of the equation of a parabola is given by

where (h, k) is the vertex of the parabola.
Given that the vertex of the parabola is (-12, -2), the equation of the parabola is given by

For a = 1,

<span>The
parabola whose minimum is at (−12,−2) is given by the equation

, where a = 24 and b = 112.</span>
You move the were the decimal to the 2 places to the right and its 3.4%