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3 years ago

Need help on the yellow question

Mathematics

2 answers:

hodyreva [135]3 years ago

8 0

8/21 is the answer to the question

Viktor [21]3 years ago

8 0

Answer:

8/21

Step-by-step explanation:

Use the method called KCF, or Keep, Change and Flip for this question.

For this question, keep the first fraction of the equation the same, but flip the 2nd fraction of the denominator and the numerator. For example, you need to change it from 3/4 to 4/3.

So it's 2/7 x 4/3 = 8/21

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Strawberries are $3.50 per pound. you bought $18.25 worth of strawberries (X=?)

Andru [333]

3.50/x=18.25 to solve for x do 18.25 divided by 3.50

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3 years ago

An automatic machine is set to fill bags of dog food with exactly 25 pounds on average with a standard deviation of 0.5 pounds.

Rasek [7]

Answer:

Step-by-step explanation:

Given that an automatic machine is set to fill bags of dog food with exactly 25 pounds on average with a standard deviation of 0.5 pounds.

Sample size = n =100

x bar = 24.85 pounds

Sample std error = $\frac{\sigma}{\sqrt{n} } =0.05$

Hypotheses:

$H_0: x bar = 25\\H_a: x bar \neq 25$

(Two tailed test at 5% level)

Mean difference =0.15

Test statistic = mean diff/se = 3

Since population std dev is known z test can be used

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Since p <0.05 we find that the bag does not contain exactly 25 pounds.

5 0

3 years ago

SOMEONE HELP ME PLEASE

Aloiza [94]

Answer:

it so easy that correct

Step-by-step explanation:

$500.00×$8.5

4 0

3 years ago

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3 years ago

Find the derivative of f(x) = negative 9 divided by x at x = -4. (6 points) 4 divided by 9 16 divided by 9 9 divided by 16 9 div

Len [333]

Answer:

9/16

Step-by-step explanation:

$f(x)=-\frac{9}{x}$

$f(x)=-9x^{-1}$

Derivative rule:

$f(x)=x^{n} \\$

$\frac{df}{dx}=nx^{n-1}$

Here, n=-1, so

$\frac{df}{dx}=(-9)(-1)x^{-2} =\frac{9}{x^{2} }$

Evaluating this at x=-4 gives 9/16

5 0

3 years ago

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