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Pavlova-9 [17]
3 years ago
13

The expression 4c gives the science test score that a student recives c correct problems. what score is for 18 correct problems

Mathematics
1 answer:
Shtirlitz [24]3 years ago
5 0
4c
4(18)
72 is the score for 18 correct problems
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A circle that is centered at the origin contains the point (0,4). How can you prove or disprove that the point (2,
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If the circle is at the origin and (0,4) is a point on the circle then the radius of the circle is:

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2. If 5 + x = 12, and you add-5 to the left side of equation, what should you add to the right side of the equation?
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Answer:

b.-5

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These roots of the polynomial equation x^4-4x^3-2x^2+12x+9=0 are 3,-1,-1. Explain why the fourth root must be a real number. Fin
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Roots with imaginary parts always occur in conjugate pairs. Three of the four roots are known and they are all real, which means the fourth root must also be real.

Because we know 3 and -1 (multiplicity 2) are both roots, the last root r is such that we can write

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There are a few ways we can go about finding r, but the easiest way would be to consider only the constant term in the expansion of the right hand side. We don't have to actually compute the expansion, because we know by properties of multiplication that the constant term will be (-3)(1)(1)(-r)=3r.

Meanwhile, on the left hand side, we see the constant term is supposed to be 9, which means we have

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Other things we could have tried that spring to mind:

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- rational root theorem

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