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Gennadij [26K]
4 years ago
15

4/7 of the fish in the tank have a red stripe on them. If 12 of the fish have red stripes, how many total fish are in the tank?

Mathematics
1 answer:
zloy xaker [14]4 years ago
5 0

Answer:

21

Step-by-step explanation:

4/7 = 12/21

Multiply each number by 3.

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A

Step-by-step explanation:

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4 years ago
What are the exact solutions of x2 − 5x − 1 = 0 using x equals negative b plus or minus the square root of the quantity b square
geniusboy [140]

Answer:

x=2.5+\frac{\sqrt{29}}{2}\\\\x=2.5-\frac{\sqrt{29}}{2}

Step-by-step explanation:

So the question here is asking you to use the quadratic formula which is expressed as: x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\\

A quadratic can generally be expressed as: y=ax^2+bx+c

So using the equation you gave: 0=x^2-5x-1

We can identify the following values: a=1, b=-5, c=-1

Btw the equation explicitly write "1" as the coefficient of x, but since it's not provided it's implied that it's 1.

So plugging in the known values, we get the following equation:

x=\frac{5\pm\sqrt{(-5)^2-4(1)(-1)}}{2(1)}\\\\x=\frac{5\pm\sqrt{25+4}}{2}\\\\x=\frac{5\pm\sqrt{29}}{2}\\\\x=2.5+\frac{\sqrt{29}}{2}\\\\x=2.5-\frac{\sqrt{29}}{2}

The last step just consists of taking the + and - solution, and since it asks for exact solutions you leave the 29 under the radical, and you don't approximate. There is no further simplification that can be done here.

5 0
2 years ago
What is the easiest way to solve a division problem that is 1,000 divides by 20
Elza [17]
1000/20 is the same as 100/2(you just removed a 0 from both of them) 10/2=5 add a 0 50
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