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antiseptic1488 [7]
2 years ago
14

If a student answered 77 exam questions correctly out of 100, what fraction

Mathematics
2 answers:
mamaluj [8]2 years ago
7 0

Answer: 23%

Step-by-step explanation: 77 + 23 is 100

bija089 [108]2 years ago
5 0

Answer:

77 out of 100

Step-by-step explanation:

For a fraction, it would look like 77/100,

and for percentage, 77%.

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Gekata [30.6K]

Answer: 2

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. Andrew made an error in determining the polynomial equation of smallest degree whose roots are 3, 2+2i
KIM [24]

Answer:

Error of Andrew: Made incorrect factors from the roots

Step-by-step explanation:

Roots of the polynomial are: 3, 2 + 2i, 2 - 2i. According to the factor theorem, if a is a root of the polynomial P(x), then (x - a) is  a factor of P(x). According to this definition:

(x - 3) , (x - (2 + 2i)) , (x - (2 - 2i)) are factors of the required polynomial.

Simplifying the brackets, we get:

(x - 3), (x - 2 - 2i), (x - 2 + 2i) are factors of the required polynomial.

This is the step where Andrew made the error. The factors will always be of the form (x - a) , not (x + a). Andrew wrote the complex factors in form of (x + a)  which resulted in the wrong answer.

So, the polynomial would be:

(x - 3)(x - 2 - 2i)(x - 2+2i)=0\\\\ (x-3)(x^{2}-2x+2xi-2x+4-4i-2xi+4i-4i^{2})=0\\\\ (x-3)(x^{2}-4x+4+4)=0\\\\ (x-3)(x^{2}-4x+8)=0\\\\ x^{3}-4x^{2}+8x-3x^{2}+12x-24=0\\\\ x^{3}-7x^{2}+20x-24=0

7 0
3 years ago
Has anyone ever gone on to ed did a quiz and u answer all ten questions with A and get 100%?
ruslelena [56]

Answer:

No, sadly ;-;

Step-by-step explanation:

7 0
3 years ago
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What is the product of (2x - 5)(2x + 5)2 ?
m_a_m_a [10]
8x^2-50 is your answer hopes this helps
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2 years ago
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