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2 years ago

Celina and Richard spend a certain amount of money from their money box each month to buy plants.

Mathematics

1 answer:

Alika [10]2 years ago

4 0

Answer:

Function 2 shows a greater rate of change, because Richard spends $6 each month and Celina spends $2 each month.

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8 (3f - g) when f = 9 and g = -3

Neko [114]

Step-by-step explanation:

8(3f-g)

when f=9, g=-3, then

8(3×9-(-3))
8(27+3)
8(30)
240

3 0

1 year ago

The population standard deviation for the temperature of beers found in Scooter's Tavern is 0.26 degrees. If we want to be 90% c

siniylev [52]

Answer:

19 beers must be sampled.

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:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

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 standard deviation for the temperature of beers found in Scooter's Tavern is 0.26 degrees.

This means that $\sigma = 0.26$

If we want to be 90% confident that the sample mean beer temperature is within 0.1 degrees of the true mean temperature, how many beers must we sample?

This is n for which M = 0.1. So

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

$0.1 = 1.645\frac{0.26}{\sqrt{n}}$

$0.1\sqrt{n} = 1.645*0.26$

$\sqrt{n} = \frac{1.645*0.26}{0.1}$

$(\sqrt{n})^2 = (\frac{1.645*0.26}{0.1})^2$

$n = 18.3$

Rounding up:

19 beers must be sampled.

7 0

2 years ago

Two lines, R and M, are represented by the following equations:

likoan [24]

Well, i'm just going to take a stab at this:

The answer out of:
> It is (18,9) ,
> It is (9, 18)
I believe both are correct as those are both plausible coordinates (although I may be wrong)

Line R: 2x + 2y = 18 (x + y = 9)
Line M: x + y = 9
There are infinite many solutions as they are the same line.

6 0

2 years ago

Sandy has box of chocolates. Box cost $2.00. In box has 8 chocolates. How much does each chocolate cost.

Lorico [155]

So you must find individual prices.

Start by doing the price($2.00)divided by the amount in box(8)

you should get 0.25 or 25 cents per chocolate

5 0

2 years ago

Read 2 more answers

Which area model represents 0.4 x 0.7 = 0.28?

sammy [17]

Answer:

the one with pink and white at the top, and the same one with purple and blue on the bottom