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mart [117]
3 years ago
14

What is the value of the discriminant of the quadratic equation -2x2=-8x+8, and what does its value mean about the number of rea

l number solutions the equation has?
The discriminant is equal to 0, which means the equation has no real number solutions.
The discriminant is equal to 0, which means the equation has one real number solution.
The discriminant is equal to 128, which means the equation has no real number solutions.
The discriminant is equal to 128, which means the equation has two real number solutions.
Mathematics
1 answer:
Virty [35]3 years ago
3 0
Yes this is crrrwvt. eva use
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charle [14.2K]

The mean is \mu=85 and standard deviation is \sigma=5. Then the variable X\sim N(85,5).

Use substitution Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}, then the variable Z\sim N(0,1).

The probability Pr(X>80) can be calculated in the following way:

for X=80, Z=\dfrac{80-85}{5} =-1 and Pr(X>80)=Pr(Z>-1). From the diagram Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84.

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

4 0
3 years ago
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Write an irrational number that can be added to the irrational number the square root of 15 to get a rational sum of 2
aniked [119]

Answer:

Step-by-step explanation:

if u is an irrational number added to a rational number (sqrt 15) to yield 2, then that would mean u would = root -1.78.....

which means you wouldn't have a real solution. if you want a complex answer, it would be sqrt(1.78)i

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3 years ago
A 135-page notebook has 33 writing lines on each page. What is the total number of writing lines in the entire notebook
ladessa [460]

Answer:

4455

Step-by-step explanation:

135 pages x 33 lines a page = 4455 lines.

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2 years ago
Anybody please help me over here
padilas [110]

Answer:

i agree

Step-by-step explanation:

because when you multply 3.141592654 times 5 you get 15.70796327.

8 0
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Convert 25 1/3% to decimal. Round to the nearest thousandth if necessary.
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Decimal: 25.3333, but converted properly it is
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