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77julia77 [94]
3 years ago
13

Karavan is a good student. her probability of making an A in algebra is .92 and in history is .88. What is the probability that

she makes an A in neither?
Mathematics
1 answer:
tankabanditka [31]3 years ago
3 0
The probability that she makes an A in neither is 0.10
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The signs of the terms are + - + -. There are 3 changes in sign, so Descartes' rule of signs tells you there are 3 or 1 positive real roots.

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_____

<em>Comment on the graph</em>

I like to find the roots of higher-degree polynomials using a graphing calculator. The red curve is the cubic. Its only rational root is r=1. By dividing the function by the known factor, we have a quadratic. The graphing calculator shows its vertex, so we know immediately what the vertex form of the quadratic factor is. The linear factors are easily found from that, as we show above. (This is the "other means" we used to find the quadratic roots.)

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