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OLEGan [10]
3 years ago
11

20 POINTS!!! Word problem: Marlon challenged her best friend, Lauren, to make a list of all the four digit numbers she could thi

nk of that have the digits nine, seven, five, and one. How many numbers should Lauren find? Please show work:
Thanks!!
Mathematics
1 answer:
Naddika [18.5K]3 years ago
8 0
The first digit could be 9 7 5 or 1
The 2nd digit could be 9 7 5 or 1
The third digit could be 9 7 5 or 1
The fourth digit could be 9 7 5 or 1
4 possibilities * 4 * 4 *4= 256 possibilities
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Answer:

The solution is n=1

Step-by-step explanation:

I hope you mean

4/5n-3/5=1/5n

if so then here's the solution

5n×4/5n-3/5×5n=1/5n×5n

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Step-by-step explanation:

they're is a neat little trick.

but first of all, "roots" means the 0 solutions of the equation. like

ax² + bx + c = 0

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these are the "roots".

now to the little trick :

when is a multiplication resulting in 0 ?

when at least one of the factors is 0.

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either

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root = -5 means (x + 5) is the other factor.

so, we have

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and the equation is

3x² + 12x - 15 = 0

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3x² + 12x = 15

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Step-by-step explanation:

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