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Rom4ik [11]
3 years ago
8

Ratio between 80% and 20%

Mathematics
1 answer:
musickatia [10]3 years ago
3 0
4:1 is the answer............
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Solve the radical equation x – 7 = square root of -4x+28. Which statement is true about the solutions to the radical equation? T
Julli [10]

Answer:

x = 3 and 7

There are two true solutions.

Step-by-step explanation:

To solve x-7 = \sqrt{-4x+28}, use inverse operations by squaring both sides of the equal sign.

(x-7)^2 = (\sqrt{-4x+28})^2\\x^2-14x+49 = -4x+28\\x^2-14x+4x+49-28 = 0\\x^2-10x+21=0

The quadratic expression can be factored into binomials and set equal to 0 by the zero product property to find x.

(x - 3) ( x - 7) = 0

x-3 = 0 so x=3

x-7 = 0 so x=7

Now check each solution into the original equation to be sure it solve the solution and is not extraneous.

7-7 = \sqrt{-4(7)+28}\\ 0=0

and

3-7 = \sqrt{-4(3)+28}\\[tex]-4 = \sqrt{16}\\-4 =-4[/tex]

3 0
3 years ago
(y-5)6+15–5y=5<br> What does the variable represent?
Strike441 [17]

Answer:

2.75

Step-by-step explanation:

(y-5)6+15–5y=5

(y-5+5)6-6+15-15–5y=5-6-15+5

y-5y=-11

-4y/-4=-11/-4

y=2.75

8 0
3 years ago
Someone help it’s urgentttt.
Molodets [167]

Answer:

Step-by-step explanation:

4 0
3 years ago
Which of the following is the correct ratio for converting kilograms to grams
Brrunno [24]

Answer:

1000 Grams : 1 Kilogram or 1 Kilogram : 1000 Grams

Step-by-step explanation:

In the metric system the value of a kilogram is solved like:

Kg = \frac{g}{1000}

When converting from grams to kilograms, we solve it like:

g = \frac{kg}{0.0010000}

Let's take for example:

2 KG is how many grams?

We use the grams to kilograms formula like so:

g = \frac{2}{0.0010000}

Then we end up with:

g = 2000

6 0
3 years ago
Determine whether the function f (x) = x + 9x” is even, odd or neither.
rusak2 [61]

Answer:

Step-by-step explanation:

This is even because if we put x=1 then we get 10 if we put x=2 then we get 20 and so on. So all these are even numbers.

8 0
3 years ago
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