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2 years ago

Help me out with the correct answer!!!!!

Mathematics

2 answers:

rosijanka [135]2 years ago

5 0

9^2 + 40^2 = 41^2
(The dark blue box is the correct answer)

1.) Figure out what is 9^2 and 40^2
9 * 9 = 81
40 * 40 = 1600

2.) Now add those two numbers together
1600 + 81 = 1681

3.) Find the square root of 1681
√1681 = 41^2

And that’s how to figure out if a triangle is a right triangle. Hope this helped :D

tester [92]2 years ago

3 0

Answer:

yellow i think

Step-by-step explanation:

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The amount of money spent on textbooks per year for students is approximately normal.

Ostrovityanka [42]

Answer:a

$336.04 < \mu < 443.96$

The margin of error will increase

The margin of error will decreases

The 99% confidence interval is $0.4107 < p < 0.4293$

Step-by-step explanation:

From the question we are told that

The sample size $n = 19$

The sample mean is $\= x = \$\ 390$

The standard deviation is $\sigma = \$ \ 120$

Given that the confidence level is 95% then the level of significance is mathematically represented as

$\alpha = 100 - 95$

$\alpha = 5 \%$

$\alpha = 0.05$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table

$Z_{\frac{\alpha }{2} } = 1.96$

The margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

=> $E = 1.96 * \frac{120}{\sqrt{19} }$

=> $E = 53.96$

The 95% confidence interval is

$\= x - E < \mu < \= x + E$

=> $390 - 53.96 < \mu < 390 - 53.96$

=> $336.04 < \mu < 443.96$

When the confidence level increases the $Z_{\frac{\alpha }{2} }$ also increases which increases the margin of error hence the confidence level becomes wider