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Soloha48 [4]
3 years ago
8

Which statement is correct about the function y = x2 – 2x – 143?

Mathematics
2 answers:
mars1129 [50]3 years ago
6 0
C is the correct answer. hope it helps. :)
Lelu [443]3 years ago
5 0

Answer:

In factor y=(x-13)(x+11) and The zeros are x=13 and x=-11

C is correct.

Step-by-step explanation:

Given: y=x^2-2x-143

Factor the function,

y=x^2-2x-143

y=(x^2-13x)+(11x-143)

y=x(x-13)+11(x-13)

y=(x-13)(x+11)

Factor of the given function is (x-13)(x+11)

If we find the zeros of the function, we will set each factor to zero.

x-13 = 0     and     x+11=0

x=13,-11

The zeros of the function are 13 and -11

Hence, In factor y=(x-13)(x+11) and The zeros are x=13 and x=-11

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BaLLatris [955]

Answer:

The test statistic is z = 1.25

Step-by-step explanation:

We are interested in determining whether or not the proportion of the student who experience anxiety during the exam is significantly more than 80%.

At the null hypothesis, we test if the proportion is 80%, that is:

H_0: p = 0.8

At the alternate hypothesis, we test if the proportion is more than 80%, that is:

H_a: p > 0.8

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

80% is tested at the null hypothesis:

This means that \mu = 0.8, \sigma = \sqrt{0.2*0.8} = 0.4

A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam.

This means that n = 100, X = \frac{85}{100} = 0.85

The test statistic is

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{0.85 - 0.8}{\frac{0.4}{\sqrt{10}}}

z = 1.25

The test statistic is z = 1.25

4 0
3 years ago
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Luden [163]

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Answer:

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Step-by-step explanation:

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