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Contact [7]
3 years ago
8

a pet store sells tropical fish one week they sell 18 angelfish, 6 tetras,and 39 guppies . the owner uses ratios of sales to com

pare the popularity of. what is the ratio different fish angelfish to guppies sold that week?
Mathematics
1 answer:
disa [49]3 years ago
5 0
6/13 is the answer to your question

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The midpoint QR is M (-1,2). One endpoint is R (3,4). Find the coordinates of the other endpoint.
butalik [34]

M = (x₁ + x₂)/2  , (y₁ + y₂)/2

(-1, 2) = \frac{3 + x}{2} , \frac{4 + x}{2}

At this point, it is easier to separate the x's and y's into two different equations:

x's: -1 = \frac{3 + x}{2}

     -2 = 3 + x

     -5 = x

y's: 2 = \frac{4 + x}{2}

     4 = 4 + x

     0 = x

Answer: (-5, 0)

7 0
3 years ago
Which value of x makes the inequality true?
grigory [225]

The answer is A.

AKA 1.6

5 0
2 years ago
A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hy
Shkiper50 [21]

Answer:

A) The researcher should reject the null hypothesis with a = .05 but not with a = .01.

Step-by-step explanation:

State the null and alternative hypotheses to be tested  

On this case we can assume that the researcher conduct a one right tailed test hypothesis like on this way:  

Null hypothesis:\mu \leq \mu_o  

Alternative hypothesis:\mu > \mu_o

The statistic for this case is given by:

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

On this case we have the value for z score given z =+1.85

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.  

The significance level provided \alpha=0.05,0.01. The next step would be calculate the p value for this test.  

Since is a one right tail test the p value would be:  

p_v =P(z>1.85)=1-P(Z  

If we compare the p value obtained and the significance level given \alpha=0.05,0.01 we can take a decision:

A) The researcher should reject the null hypothesis with a = .05 but not with a = .01.

YES, since the p value it's higher than the significance level of 0.01 so we FAIL to reject the null hypothesis at this significance level. And for the significance level 0.05 we have that p_v and we can reject the null hypothesis.

B) The researcher should reject the null hypothesis with either a = .05 or a = .01.

No since the p value it's higher than the significance level of 0.01 so we FAIL to reject the null hypothesis at this significance level

C) The researcher should fail to reject H0 with either a = .05 or a = .01.

No, for the significance level of 0.05 we reject the null hypothesis since p_v

D) This cannot be answered without additional information.

No, we have enough info to answer the question

4 0
3 years ago
I will give 30 points if u help now
Amiraneli [1.4K]

Answer:

3. x=16

4. x=51

Step-by-step explanation:

3. 3x-8=x+24

2x=32

x=16

4. 2/3(x+27)= 180-(3x-25)

2/3x+18=180-3x+25

11/3x=187

11x=561

x=51

5 0
3 years ago
Read 2 more answers
Today the price of a Jeep is $25,000. In 1970, the price was $5,000. What's the price relative?
IgorC [24]

Answer:

$500

Step-by-step explanation:

Today the price of a Jeep is $25,000.

In 1970, the price was $5,000.

We need to find the relative price. It can be calculated as follows :

P=\dfrac{25000}{5000}\times 100\\\\P=\$500

So, the relative price is $500.

4 0
3 years ago
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