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3 years ago

6

Brainiest will be given . Please help me

1 answer:

mixas84 [53]3 years ago

6 0

Answer:

If the shape of end face has n sides

Then, in total, there are n+2 faces

Using that formula

Faces in 20-sided polygon = n+2 = 20+2 = 22

Step-by-step explanation:

Pls vote as brainliest

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What is the value of x

Mekhanik [1.2K]

Answer:

Depends on the domain and the graph.

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

A student takes an exam containing 18 multiple choice questions. The probability of choosing a correct answer by knowledgeable g

lawyer [7]

When you have to repeatedly take the same test, with constant probability of succeeding/failing, you have to use Bernoulli's distribution. It states that, if you take $n$ tests with "succeeding" probability $p$ , and you want to "succeed" k of those n times, the probability is

$\displaystyle P(n,k,p) = \binom{n}{k}p^k(1-p)^{n-k}$

In your case, you have n=18 (the number of tests), and p=0.3 (the probability of succeeding). We want to succeed between 8 and 12 times, which means choosing k=8,9,10,11, or 12. For example, the probability of succeeding 8 times is

$\displaystyle P(18,8,0.3) = \binom{18}{8}(0.3)^8(0.7)^{10}$

you can plug the different values of k to get the probabilities of succeeding 9, 10, 11 and 12 times, and your final answer will be

$P = P(18,8,0.3) + P(18,9,0.3) + P(18,10,0.3) + P(18,11,0.3) + P(18,12,0.3)$

3 0

4 years ago

Help me again plz quick

madreJ [45]

Answer:

72/18=4

Step-by-step explanation:

3 0

3 years ago

(5x^2 - 3x)(8x^2 + 4x)

timurjin [86]

For this case we have the following expression:

$(5x ^ 2-3x) (8x ^ 2 + 4x)$

To find the product, we apply distributive property that states:

$(a + b) (c + d) = ac + ad + bc + bd$

So:

$(5x ^ 2) (8x ^ 2) + (5x ^ 2) (4x) - (3x) (8x ^ 2) - (3x) (4x) =\\40x ^ 4 + 20x ^ 3-24x ^ 3-12x ^ 2 =\\40x ^ 4-4x ^ 3-12x ^ 2$

ANswer:

$40x ^ 4-4x ^ 3-12x ^ 2$

4 0

3 years ago

For the function, find all critical numbers and then use the second-derivative test to determine whether the function has a rela

Serhud [2]

Answer:

relative maximum: x = 1

relative minimum: x = 7

Step-by-step explanation:

Critical points:

Values of x for which f'(x) = 0.

Second derivative test:

For a critical point, if f''(x) > 0, the critical point is a relative minimum.

Otherwise, if f''(x) < 0, the critical point is a relative maximum.

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\bigtriangleup}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\bigtriangleup}}{2*a}$

$\bigtriangleup = b^{2} - 4ac$

In this question:

$f(x) = x^{3} - 12x^{2} + 21x - 8$

Finding the critical points:

$f'(x) = 3x^{2} - 24x + 21$

$3x^{2} - 24x + 21 = 0$

Simplifying by 3

$x^{2} - 8x + 7 = 0$

So $a = 1, b = -8, c = 7$

$\bigtriangleup = (-8)^{2} - 4*1*7 = 36$

$x_{1} = \frac{-(-8) + \sqrt{36}}{2} = 7$

$x_{2} = \frac{-(-8) - \sqrt{36}}{2} = 1$

Second derivative test:

The critical points are x = 1 and x = 7.

The second derivative is:

$f''(x) = 6x - 24$

$f''(1) = 6*1 - 24 = -18$

Since f''(1) < 0, at x = 1 there is a relative maximum.

$f''(7) = 6*7 - 24 = 18$

Since f''(x) > 0, at x = 7 there is a relative minumum.

8 0

3 years ago