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3 years ago

PLLSSSS HELP QUICKLY .

Mathematics

2 answers:

valina [46]3 years ago

7 0

Answer:

Step-by-step explanation:

A population is a group of the same organism living in a particular area - in this case, it's the total number of brook trout in the pond.

B is wrong because it is not proportion. Proportion refers to a part of a whole, and in this problem, we want the whole thing.

C is wrong because it's not a sample. Again, sample is similar to proportion in that it's only a small group out of the big group - not what we're looking for.

D is wrong because it's not the population of fish. Fish is really broad and general and can include populations of other fish species like tuna or goldfish. We only want brook trout.

Thus, the answer is A.

Hope this helps!

omeli [17]3 years ago

6 0

A :) is the correct anwser

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Select the symbol = (equal to) or ≠ (not equal to) to make the expression true. <br> {0} ? { }

Sever21 [200]

Answer:

Step-by-step explanation:

{0}={} because 0 means that there is nothing and in null set too, there is no elements.

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2 years ago

A concentric-tube heat exchanger cools hot water owing at 1 kg/s from 80C to 30C. It uses air owing at 5 kg/s to perform this co

nordsb [41]

Answer:

The log-mean-temperature-difference is 24.03⁰C

Step-by-step explanation:

First we need to know if the heat exchanger is in parallel flow or counter-flow. However, counter flow arrangement is best used to recover heat.

L.M.T.D for counter flow is given as;

$L.M.T.D =\frac{(T_h_f_1 -T_c_f_2)-(T_h_f_2 -T_c_f_1)}{2.3log[\frac{T_h_f_1 -T_c_f_2}{T_h_f_2 -T_c_f_1}]}$

where;

Thf₁ is the initial temperature of the hot fluid = 80°C

Tcf₂ is the final temperature of the cold fluid = 51.5°C

Thf₁ - Tcf₂ = 80 - 51.5 = 28.5⁰C

Thf₂ is the final temperature of the hot fluid = 30°C

Tcf₁ is the initial temperature of the cold fluid = 10°C

Thf₂ - Tcf₁ = 30 - 10 = 20⁰C

$L.M.T.D = \frac{28.5 -20}{2.3Log[\frac{28.5}{20}]} \\\\L.M.T.D = \frac{8.5}{0.3538} =24.03^oC$

Therefore, the log-mean-temperature-difference is 24.03⁰C

3 0

3 years ago

Read 2 more answers

Pick the expression that matches this description:

Katen [24]

Option C is correct because it is a trinomial with a leading coefficient of 3 and a constant term of -5

Step-by-step explanation:

We need to pick the expression that matches this description:

A trinomial with a leading coefficient of 3 and a constant term of -5

First lets explain the terms:

Trinomial: a polynomial having 3 terms

Leading coefficient: The constant value of variable having highest power

Constant term: Having no variable and value cannot be changed.

Now using these definitions, we can choose the correct option

Option A is incorrect because the expression has 2 terms

Option B is incorrect because it is a trinomial but the leading coefficient is -5 and not 3 constant term is 3 and not -5.

Option C is correct because it is a trinomial with a leading coefficient of 3 and a constant term of -5

Option D is incorrect because it is a trinomial but the leading coefficient is 3 but constant term is 1 and not -5.

So, Option C is correct.

Keywords: Algebra

Learn more about Algebra at:

#learnwithBrainly

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3 years ago

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Andrew [12]

The correct answer would be 11:32am. i hope this helps!

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3 years ago

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Solve the inequality r 4-2(r-14)>0

klasskru [66]

R^4-2(r-14)>0
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3 years ago