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Anvisha [2.4K]
4 years ago
6

Find the critical point of the function f(x) = x2 – 2x + 7.

Mathematics
1 answer:
vesna_86 [32]4 years ago
3 0

Answer:

x=1 is a critical point of the function f(x).

Step-by-step explanation:

f(x)=x^2-2x+7

Differentiate both sides w.r.t. x

\Rightarrow f'(x)=2x-2

Now, f'(x)=0

\therefore 2x-2=0

\Rightarrow 2x=2

\Rightarrow x=1

Hence, x=1 is a critical point of the given function.

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Suppose the life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 8 months. W
rusak2 [61]

Answer:

Probability that the calculator works properly for 74 months or more is 0.04 or 4%.

Step-by-step explanation:

We are given that the life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 8 months.

Firstly, Let X = life span of a calculator

The z score probability distribution for is given by;

         Z = \frac{ X - \mu}{\sigma} ~ N(0,1)

where, \mu = population mean = 60 months

            \sigma = standard deviation = 8 months

Probability that the calculator works properly for 74 months or more is given by = P(X \geq 74 months)

     P(X \geq 74) = P( \frac{ X - \mu}{\sigma} \geq \frac{74-60}{8} ) = P(Z \geq 1.75) = 1 - P(Z < 1.75)

                                                   = 1 - 0.95994 = 0.04

Therefore, probability that the calculator works properly for 74 months or more is 0.04 or 4%.

7 0
3 years ago
Find the slope of the line that passes through<br> (-4, 7) and (-6, -4)
Kitty [74]

Answer:

The slope of the line is 11/2

remember, rise over run.

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
Kyra observed that 85% of the students at a library liked reading mystery stories. If 30 students at the library did not like re
UkoKoshka [18]
It is said that 85% of the students liked reading mystery stories. This means the remaining 15% don't like to read these stories. If there are 30 students belonging to the second category, then the number of students who liked reading mystery stories is (30/0.15)*0.85 equal to 170 students out of 200 students.
6 0
3 years ago
Express each number as a product of its prime factor of 39
vitfil [10]
If you just mean the product of the prime factors of 39 then this is the answer

39 = 3 x 13
5 0
3 years ago
6x - 3y = -6<br> y = 2x + 2
Verizon [17]

Answer:

y=0, x=1

Step-by-step explanation:

6x-3y= -6 ...... equation 1

y =2x+2 ..... equation 2

subtract 2x from both sides

y-2x=2x-2x+2

y-2x=2

6x-3y= -6

y-2x=2

Rearrange

6x-3y= -6 ........x1

-2x +y=2............x3

6x-3y= -6

-6x +3y=2

0y=0

y=0

substitute y=0 in equation 1

6x-3xo= -6

6x= -6

x-6/6

x = -1

4 0
4 years ago
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