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3 years ago

The number of goldfish in a tank is 12, and the volume of the tank is 45 cubic feet. What is the density of the tank?

Mathematics

2 answers:

Lady_Fox [76]3 years ago

7 0

Answer:

0.22

Step-by-step explanation:

In this problem, we divide 12 goldfishes by 45 cubic feet. This is equal to 0.27 goldfish per cubic feet. Answer is A.

0.22

Alex777 [14]3 years ago

7 0

Answer:

0.27

Step-by-step explanation:

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X = O, because 9-2*0 equals 9

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What is the solution to the system of equations represented by the two equations?

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If you would like to solve the following system of equations, you can do this like this:

y = - 2 * x + 7
y = 1/3 * x
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3 years ago

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3 years ago

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2 years ago

In a set of 25 aluminum castings, four castings are defective (D), and the remaining twenty-one are good (G). A quality control

lianna [129]

Answer:

The sample space for selecting the group to test contains 2,300 elementary events.

Step-by-step explanation:

There are a total of N = 25 aluminum castings.

Of these 25 aluminum castings, n₁ = 4 castings are defective (D) and n₂ = 21 are good (G).

It is provided that a quality control inspector randomly selects three of the twenty-five castings without replacement to test.

In mathematics, the procedure to select k items from n distinct items, without replacement, is known as combinations.

The formula to compute the combinations of k items from n is given by the formula:

${n\choose k}=\frac{n!}{k!(n-k)!}$

Compute the number of samples that are possible as follows:

${25\choose 3}=\frac{25!}{3!\times (25-3)!}$

$=\frac{25\times 24\times 23\times 22!}{3!\times 22!}\\\\=\frac{25\times 24\times 23}{3\times 2\times 1}\\\\=2300$

The sample space for selecting the group to test contains 2,300 elementary events.

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3 years ago