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grigory [225]
3 years ago
9

Help please 25 points multiply.

Mathematics
1 answer:
Nataliya [291]3 years ago
4 0

Answer:

When you multiply one positive and one negative, you get a negative solution. When you multiply two negatives, you get a positive solution.

(-564)x(1.4)

-789.6

:)

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A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classe
gulaghasi [49]

Answer:

0.3137 ; 0.2228

Step-by-step explanation:

Given a normal distribution :

Morning class :

Mean(Mm) = 71%

Standard deviation (Sm) = 12%

Afternoon class:

Mean(Ma) = 78%

Standard deviation (Sa) = 8%

M = Mm - Ma = (71 - 78) = - m7

S = √Sm + Sa = √12² + 8² = √208

A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class?

P(morning > afternoon) = p(morning - afternoon > 0)

Using:

Z = (0 - (-7)) / S

Z = 7 / √208

Z = 0.4853628

P(Z > 0.49) = 0.3137

B)

What is the probability that the mean mark of four randomly selected students from a morning class is greater than the average mark of four randomly selected students from an afternoon class?

Using:

Z = (4 - (-7)) / S

Z = 11 / √208

Z = 0.7627127

P(Z > 0.49) = 0.2228

6 0
4 years ago
Х<br> Area of trapezoids<br> Find the area.<br> 6 cm<br> 3 cm<br> 3 cm<br> square centimeters
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Answer:

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2 years ago
Find the value of $x$ that maximizes $$f(x) = \log (-20x + 12\sqrt{x}).$$ If there is no maximum value, write "NONE".
kakasveta [241]
The function is written as:
f(x) = log(-20x + 12√x)
To find the maximum value, differentiate the equation in terms of x, then equate it to zero. The solution is as follows.

The formula for differentiation would be:
d(log u)/dx = du/u ln(10)
Thus,
d/dx = (-20 + 6/√x)/(-20x + 12√x)(ln 10) = 0
-20 + 6/√x = 0
6/√x = 20
x = (6/20)² = 9/100

Thus,
f(x) =  log(-20(9/100)+ 12√(9/100)) = 0.2553

<em>The maximum value of the function is 0.2553.</em>
5 0
3 years ago
F(x)=x^2-x^3 find the value of f(-2)
gulaghasi [49]

The Correct answer is 3

Explanation:

Using the defined function, f(a) will produce the same result when substituted for x:

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Setting this equal to 4, you can solve for a:

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8 0
3 years ago
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