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3 years ago

Noa buys 6 items that each cost $4.25 and 3 items that each cost $6.75. How much does Noa spend in total?

Mathematics

2 answers:

den301095 [7]3 years ago

4 0

Answer:

Answer is D - $45.75

Step-by-step explanation:

(6 x $4.25) + (3 x $6.75) = $45.75

Ira Lisetskai [31]3 years ago

3 0

Answer:

D) $45.75

Step-by-step explanation:

Step One: Multiply 6 times 4.25 and get 25.5

Step Two: Multiply 3 times 6.75 and get 20.25

Step Three: Add both answers together: 25.5 + 20.25 and get 45.75 which is your answer.

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A school authority claims that the average height of students is 178 cm. A researcher has taken a well-designed survey and his s

Hunter-Best [27]

Answer:

d) The difference exists due to chance since the test statistic is small

Step-by-step explanation:

From the given information:

Population mean = 178 cm

the sample mean = 177.5 cm

the standard deviation = 2

the sample size = 25

The null hypothesis and the alternative hypothesis can be computed as:

Null hypothesis:

$H_o: \mu = 178$

Alternative hypothesis:

$H_1: \mu \neq 178$

The t-test statistics is determined by using the formula:

$t = \dfrac{X - \mu}{\dfrac{\sigma}{\sqrt{n}}}$

$t = \dfrac{177.5 - 178}{\dfrac{2}{\sqrt{25}}}$

$t = \dfrac{-0.5}{\dfrac{2}{5}}}$

$\mathbf{t= -1.25}$

Degree of freedom df = n- 1

Degree of freedom df = 25 - 1

Degree of freedom df = 24

At the level of significance ∝ = 0.05, the critical value = 2.064

Decision rule: To reject the null hypothesis if the test statistics is greater than the critical value at 0.05 level of significance

Conclusion: We fail to reject the null hypothesis since the test statistics is lesser than the critical value and we conclude that the difference exists due to chance since the test statistic is small

5 0

3 years ago

Help me with this please

Leya [2.2K]

Answer:

280

Step-by-step explanation:

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6 0

2 years ago

What is the gcf of 45 and 75

kherson [118]

Hi,

Answer: The Greatest Common Factor (GCF) of 45 and 75 is 3 and 5.

<u>My work:</u> To find the Greatest Common Factor (GCF) Divide and simplify both numbers until you find your match or your GCF.

I Hope I Helped!

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2 years ago

Read 2 more answers

The speed of the boat going with a current is 20 mph. When the boat goes against the current, the speed is 16 mph. Find the spee

adoni [48]

Answer:

The speed of the boat in still water is 18 mph.

The speed of the current is 2 mph

Step-by-step explanation:

Let x represent the speed of the boat in still water.

Let y represent the speed of the current.

When the boat goes against the current, the speed is 16 mph. Assuming it traveled against the current while going upstream, its total speed would be (x - y) mph. It means that

x - y = 16 (equation 1)

Going downstream, the boat averages 20 mph. Assuming it traveled with the current, its total speed would be (x + y) mph. It means that

x + y = 20 (equation 2)

Adding both equations, it becomes

2x = 36

x = 36/2

x = 18 mph

Substituting x = 18 into equation 1, it becomes

18 - y = 16

y = 18 - 16

y = 2 mph

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2 years ago

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3 years ago