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dlinn [17]
3 years ago
9

What is the ratio of tetras to catfishes

Mathematics
2 answers:
Reil [10]3 years ago
7 0
Umm where is the numbers!! So if your ratio was 2:10 then you have to simplify so if you simplify them you will get 1/5 so the ratio to tetras to catfish is 1to 5 this was just a example!!! It's not the answer it is just an example!!
Daniel [21]3 years ago
4 0
?????? what are the options?????

just do t:c if a big # simplify it divide them both by the same #
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The level of dissolved oxygen (DO) in a stream or river is an important indicator of the water's ability to support aquatic life
kaheart [24]

Answer:

a) It is most appropiate to apply t procedures with this sample because the population standard deviation is unknown. We have to estimate it from the sample standard deviation.

b) There is no enough evidence to claim that disolved oxygen level is below 5 mg/l.

c) As the null hypothesis was not rejected, the only error we could have made is a Type II error.

This Type II error is made when fail to reject the null hypotesis even when the alternative hypothesis is true.

In this context, it would mean that the aquatic life is really at risk (dissolved oxygen levels below 5 mg/l), but because the sample results combined with its size were not giving enough evidence to prove the claim.

Step-by-step explanation:

b) We have to perform a hypothesis test on the mean, at a significance level of 0.05.

The null and alternative hypothesis are:

H_0:\mu\geq 5\\\\H_a: \mu

The sample mean is 4.77 and the sample standard deviation is 0.94.

The sample size is 15, so the degrees of freedom are:

df=n-1=15-1=14

The t-statistic is:

t=\frac{\bar x-\mu}{s/\sqrt{n}} =\frac{4.77-5}{0.94/\sqrt{15}}= \frac{-0.23}{0.242}=-0.95

For a t=0.95 and df=14, the P-value is P=0.18.

This P-value is bigger than the significance level, so the null hypothesis is failed to be rejected.

There is no enough evidence to claim that disolved oxygen level is below 5 mg/l.

6 0
3 years ago
PLEASE I NEED HELP!! NO LINKS!!
SCORPION-xisa [38]

Answer:

m<N = 32°

m(NQ) = 106°

Step-by-step explanation:

Inscribed angle = ½ of the measure of the intercepted arc (inscribed angle theorem)

<N is an inscribed angle

It's intercepted arc = arc MP = 64°

Therefore,

m<N = ½(64°)

m<N = 32°

m<P = ½(m(NQ)) (inscribed angle theorem)

53° = ½(m(NQ))

Multiply both sides by 2

2*53° = m(NQ)

106° = m(NQ)

m(NQ) = 106°

5 0
2 years ago
4(h+11)-15<br> The solution
skad [1K]

Answer:

=4h+29

Step-by-step explanation:

I hope this helps you

7 0
3 years ago
A) what is average rate of change of f(x) over the interval from x=5 to x=9? (table shows values of f(x). graph shows function o
SVETLANKA909090 [29]

Answer:

See below for answers and explanations

Step-by-step explanation:

<u>Part A</u>

The average rate of change of a function over the interval [a,b] is equal to \frac{f(b)-f(a)}{b-a}, hence:

\frac{f(b)-f(a)}{b-a}\\\\\frac{f(9)-f(5)}{9-5}\\\\\frac{14-(-4)}{9-5}\\ \\\frac{14+4}{4}\\ \\\frac{18}{4}\\ \\\frac{9}{2}

Therefore, the average rate of change of f(x) over the interval [5,9] is \frac{9}{2}.

<u>Part B</u>

Do the same thing as in Part A:

\frac{f(b)-f(a)}{b-a}\\ \\\frac{f(1)-f(0.25)}{1-0.25}\\ \\\frac{2-5}{0.75}\\ \\\frac{-3}{0.75}\\ \\-4

Therefore, the average rate of change of g(x) over the interval [0.25,1] is -4.

<u>Part C</u>

To interpret our answer from Part B in terms of the real world it represents, we say that between 0.25 seconds and 1 second, the ball falls at a rate of 4 feet per second (since our average rate of change is negative).

5 0
2 years ago
Which option below demonstrates the correct interval notation for a
Vladimir [108]

The correct interval notation for the continuous set of all numbers between 5 and 6, including 5, but not including 6 is [5, 6) option (C) is correct.

<h3>What is interval notation?</h3>

It is defined as the representation of a set of values that satisfy a relation or a function. It can be represented as open brackets and close bracket the close the brackets means the value is at the close bracket also included, and open bracket means the value at the open bracket does not include.

We have:

Continuous set of all numbers between 5 and 6, including 5, but not including 6.

From the above statement we can represent the number in the interval notation:

The numbers are between 5 and 6.

(5, 6)

As it is mentioned that 5 is included and 6 is not included, then:

[5, 6)

Thus, the correct interval notation for the continuous set of all numbers between 5 and 6, including 5, but not including 6 is [5, 6) option (C) is correct.

Learn more about the interval notation here:

brainly.com/question/13048073

#SPJ1

3 0
1 year ago
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