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stealth61 [152]
3 years ago
6

Whats three and one half minus four and one half

Mathematics
1 answer:
liubo4ka [24]3 years ago
8 0
= 10 hole minus. U add the two halfs then ad the hole minus
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What are the solutions to the quadratic equation below x^2+20x+100=7​
aleksandrvk [35]

First you must have the quadratic equal to zero. In order to do this you must subtract 7 to both sides

x^2 + 20x + (100 - 7) = 7 - 7

x^2 + 20x + 93 = 0

Now you must find two numbers who's sum equals 20 and their multiplication equal 93

Are there any? NO!

This means that you have to use the formula:

\frac{-b±\sqrt{b^{2} - 4ac} }{2a}

In this case:

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\frac{-(20) plus/minus\sqrt{20^{2} - 4(1)(93)} }{2*1}

\frac{-20 plus/minus\sqrt{400 - 372} }{2}

\frac{-20 plus/minus\sqrt{28} }{2}

^^^We must simplify √28

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so...

\frac{-20 plus/minus 2\sqrt{7} }{2}

simplify further:

-10 plus/minus\sqrt{7

-10 + √7

or

-10 - √7

***plus/minus = ±

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7 0
3 years ago
1<br> Enter the correct answer in the box.<br> Simplify the expression (62,4.
adelina 88 [10]

Answer:

248

Step-by-step explanation:

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4 0
3 years ago
80 is 50% of what number
KonstantinChe [14]

Answer:

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Step-by-step explanation:

In order to find this, we take the whole number and divide by the percentage that it represents. This gives us the number we are looking for.

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3 0
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melomori [17]

Answer:

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Step-by-step explanation:

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Answer:

317

Step-by-step explanation:

I did this on khan academy

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