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3 years ago

Please need help on this question.

Mathematics

1 answer:

Stella [2.4K]3 years ago

8 0

Answer:

(4,5)

Step-by-step explanation:

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Please help me 6th grade are they correct?

Sergio039 [100]

Yes They are correct

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3 years ago

Read 2 more answers

PLEASE HELP - One of the solutions to the x to the second power -14x + 45 =0 is x=5. What is the other solution?

Advocard [28]

Step-by-step explanation:

x^2 -14x + 45 =0

look for two numbers that their :

sum= - 14 (-5 & -9)

products = 45 (-5 & -9)

so,

(x-5)(x-9)=0

thus,

x=5, x=9 (ANS)

7 0

3 years ago

Superman can run so fast that he can runon water as well as land, and he never getstired. His average running speed is Mach 4, o

Elan Coil [88]

Answer:

It will take Superman 32.71 hours or 32 hours and 43 minutes

Step-by-step explanation:

Convert kilometers to meters

40,075 kilometers = 40,075,000 meters

$\frac{340.29meters}{1 second} = \frac{40,075,000 meters}{x seconds}$ Cross multiply

340.29x = 40,075,000

x = 117,767.19 seconds

Convert seconds to hours

$\frac{3600 seconds}{1 hour} = \frac{117,767.19 seconds}{x hours}$ Cross multiply again

3600x = 117767.19

x = 32.71 hours or 32 hours and 43 minutes

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3 years ago

A 5-ounce can of tuna costs $0.90.A 12-ounce can of tuna cotst 2.40. which is the better buy

Julli [10]

0.90/5 = 18 cents per ounce

2.40/12 = 20 cents per ounce

The 12 ounce can because you get more for only two cents more

3 0

3 years ago

Q6.4☆ Points: 2 Suppose that Angela wants to use her sample to create a 68% confidence interval for the true population median o

Andrei [34K]

Answer:

She needs a sample size of 25.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.68}{2} = 0.16$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.16 = 0.84$ , so Z = 0.995.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The population SD is 2 grams.

This means that $\sigma = 2$

What is the minimum sample size she needs to create a confidence interval that has a width of 0.4 grams?

She needs a sample size of n.

n is found when M = 0.4. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.4 = 0.995\frac{2}{\sqrt{n}}$

$\sqrt{n} = \frac{0.995*2}{0.4}$

$(\sqrt{n})^2 = (\frac{0.995*2}{0.4})^2$

$n = 24.8$

Rounding up:

She needs a sample size of 25.

7 0

2 years ago