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3 years ago

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1 answer:

grandymaker [24]3 years ago

4 0

OH WOW STEP BY STEP

CMON DAWG

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Please help me guys with this question. Thanks

elena-s [515]

The correct answer is 1733.28.

2(3.14)(6^2)+2(3.14)(6)(40)

7 0

3 years ago

A publisher reports that 55% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is

Irina18 [472]

Answer:

We fail to reject the null hypothesis, we accept H₀

Step-by-step explanation:

Population proportion p₀ = 55 % p₀ = 0,55

Sample size n = 280

Sample mean p = 51 % p = 0,51 q = 0,49

n*p and n*q are both bigger than 10 therefore we can approximate the binomial distribution to a normal distribution

Test Hypothesis

Null Hypothesis H₀ p = p₀

Alternative Hypothesis Hₐ p ≠ p₀

Significance level is α = 0,05 but we have a two-tail test then

α/2 = 0,025

z(c) = - 1,96

Computing z(s)

z(s) = ( p - p₀ ) / √(p*q)/n

z(s) = ( 0,51 - 0,55 ) / √(0,51*0,49)/280

z(s) = - 0,04 * 16,73 / 0,5

z(s) = - 1,34

Comparing

z(s) and z(c)

- 1,34 < - 1,96

| z(s) | < | z(c)|

Then z(s) is in the acceptance region, we accept H₀

6 0

3 years ago

2x-5=3x^2 find the root of X

Zina [86]

For this case we must solve the following quadratic equation:

$3x ^ 2-2x + 5 = 0$

Where:

$a = 3\\b = -2\\c = 5$

The roots are given by:

$x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}$

Substituting the values we have:

$x = \frac {- (- 2) \pm \sqrt {(- 2) ^ 2-4 (3) (5)}} {2 (3)}\\x = \frac {- (- 2) \pm \sqrt {(- 2) ^ 2-4 (3) (5)}} {2 (3)}\\x = \frac {2 \pm \sqrt {4-60}} {6}\\x = \frac {2 \pm \sqrt {-56}} {6}$

By definition we have to:

$i ^ 2 = -1\\x = \frac {2 \pm \sqrt {56i ^ 2}} {6}\\x = \frac {2 \pm i \sqrt {56}} {6}\\x = \frac {2 \pm i \sqrt {2 ^ 2 * 14}} {6}\\x = \frac {2 \pm 2i \sqrt {14}} {6}\\x = \frac {1 \pm i \sqrt {14}} {3}$

We have two complex roots:

$x_ {1} = \frac {1+ i \sqrt {14}} {3}\\x_ {2} = \frac {1- i \sqrt {14}} {3}$

Answer:

$x_ {1} = \frac {1+ i \sqrt {14}} {3}\\x_ {2} = \frac {1- i \sqrt {14}} {3}$

4 0

3 years ago

8x-5y=-118x−5y=−118, x, minus, 5, y, equals, minus, 11 xxx-intercept: \Big((left parenthesis ,,comma \Big))right parenthesis yyy

SOVA2 [1]

You need to put a picture on here instead of that.

6 0

4 years ago

Read 2 more answers

Simplify: 30 - 23 × 3

gogolik [260]

The answer to this question would be 39..here is why:

First you multiply 23 x 3..because multiplication or division always comes before addition or subtraction.

Second, you get the product from 23 x 3 which is 69..and you subtract 30 from that.

Last, after you do that you get an over all answer of 39..

Hope this helps!!

4 0

3 years ago