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3 years ago

Solve by graphing: x^2-6x+9=0

Mathematics

1 answer:

irinina [24]3 years ago

6 0

Hello :
the solution :x²-6x+9=0 is the x- intresept and graph of f(x) =x²-6x+9
the solution is : x=3

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OlgaM077 [116]

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8 0

2 years ago

Simplify the expression 112+218

otez555 [7]

Answer:

330

Step-by-step explanation:

112

+218

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6 0

4 years ago

63 is 75% of what number? Enter your answer in the box.

Viefleur [7K]

75% of x = 63

75/100 * x = 63 

So dividing by 75 / 100 on both sides 

x = 63 / 75 / 100 

x = 63*100/75 
x = 84 
The number is 84 

So 75% of 84 = 63! 

Hope that helps!

3 0

3 years ago

The average number of mosquitoes in a stagnant pond is 80 per square meter with a standard deviation of 12. If 36 square meters

svp [43]

Answer:

a) 18.4%

Step-by-step explanation:

Assuming a normal distribution, the z-score (z) for the probability of the average of the mosquitoes count being 'X' is given by:

$z(X)=\frac{X-\mu }{\frac{\sigma}{\sqrt{n}}}$

Where 'μ' is the distribution mean, 'σ' is the standard deviation and 'n' is the number of square meters chosen.

For X = 81.8 and n=36:

$z(X)=\frac{81.8 - 80}{\frac{12}{\sqrt{36}}}\\z(X)= 0.9$

A z-score of 0.9 is equivalent to the 81.59 th percentile in a normal distribution.

Therefore, the probability (P) that the average of those counts is more than 81.8 mosquitoes per square meter is:

$P= 100\% - 81.59\%\\P=18.41\%$

8 0

3 years ago

Please help me with this problem!

pantera1 [17]

12/100x10000 = 1200

17/100x8000= 1360

1360+1200 = 2560

18000 - 2560 = $15,440 (final cost)

5 0

3 years ago