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Grace [21]
3 years ago
12

If a bill cost $125. And they leave a $21.25 for a tip what percentage did they tip

Mathematics
1 answer:
yanalaym [24]3 years ago
6 0

Answer:

17%

Step-by-step explanation:

Divide $21.25 by $125

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N² + 14 = 12n<br>how do I solve by quadratic formula ​
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Answer:

n = 6 + \sqrt{22}  or  n = 6 - \sqrt{22}

Step-by-step explanation:

We can solve this equation using the quadratic formula OR Completing the Square method.

n² + 14 = 12n

rearrange :  n² - 12n + 14  = 0  

here  a= 1 , b = -12,  c = 14

the quadratic formula says:   x =  - b/ (2a)  +  root(b^2 - 4ac) / (2a)

or  x =  - b/ (2a)  -  root(b^2 - 4ac) / (2a)

x =  - (-12)/ (2)  +  root((-12)^2 - 4*14) / (2)

x = 6  +  root (144 - 56) / 2

x = 6 + root(88)/2

x = 6 + root(4*22) / 2

x = 6 + 2*root(22)/2

x = 6 + root(22)  = 6 + \sqrt{22}

so   x =6 + \sqrt{22}   or  x = 6 - \sqrt{22}

In this case  x = n

n = 6 + \sqrt{22}  or  n = 6 - \sqrt{22}

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Answer:

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Step-by-step explanation:

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x=7/5, y=8

Step-by-step explanation:

You can use substitution.

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