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sukhopar [10]
3 years ago
7

PLEASE HELP!!!! Factor: 9a^2 - 121

Mathematics
2 answers:
bekas [8.4K]3 years ago
7 0

Answer:

\sf\:{9a}^{2}  - 121

\sf\:{(3a)}^{2}  -  {(11)}^{2}

\sf\:(3a + 11)(3a - 11)

saw5 [17]3 years ago
6 0

Answer:

(3a + 11) (3a - 11)

Step-by-step explanation:

:))

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Trials in an experiment with a polygraph include 97 results that include 23 cases of wrong results and 74 cases of correct resul
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Answer:

H0:p= 0.80                 H1: p< 0.80  one tailed test

Step-by-step explanation:

We state the null and alternative hypotheses as that the results are 80 % against the claim that the results are less than 80%.

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The test statistic used here is

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z= -0.037/ 0.0406

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The Z∝ = ±1.645 for ∝= 0.05 for one tailed test.

As the calculated value  does not fall in the critical region  we fail to reject the null hypothesis. There is not sufficient evidence to support  the claim that such polygraph results are correct less than 80% of the time.

Using the normal probability table.

P (Z <  -0.9113)= 1- P(z= 0.9311) = 1- 0.8238= 0.1762

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0.1762> 0.005  Fail to reject H0.

8 0
3 years ago
Answer these please
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Answer:

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(x-2)(x-2)

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