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4 years ago

If f(x)=2x^2+3x-4, find 2f(x)

Mathematics

1 answer:

mixas84 [53]4 years ago

7 0

Answer : wow this is in college O_O

Explanation : I- .... that’s hard I would of dropped out T-T

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Of 4 consecutive integers, the sum of the second

fiasKO [112]

Answer:

I don't know sorry

Step-by-step explanation:

3 0

4 years ago

A store selling newspapers orders only n = 4 of a certain newspaper because the manager does not get many calls for that publica

umka2103 [35]

Answer:

a) The expected value is 2.680642

b) The minimun number of newspapers the manager should order is 6.

Step-by-step explanation:

a) Lets call X the demanded amount of newspapers demanded, and Y the amount of newspapers sold. Note that 4 newspapers are sold when at least four newspaper are demanded, but it can be more than that.

X is a random variable of Poisson distribution with mean $\mu = 3$ , and Y is a random variable with range {0, 1, 2, 3, 4}, with the following values

PY(k) = PX(k) = ε^(-3)*(3^k)/k! for k in {0,1,2,3}
PY(4) = 1 -PX(0) - PX(1) - PX(2) - PX (3)

we obtain:

PY(0) = ε^(-3) = 0.04978..

PY(1) = ε^(-3)*3^1/1! = 3*ε^(-3) = 0.14936

PY(2) = ε^(-3)*3^2/2! = 4.5*ε^(-3) = 0.22404

PY(3) = ε^(-3)*3^3/3! = 4.5*ε^(-3) = 0.22404

PY(4) = 1- (ε^(-3)*(1+3+4.5+4.5)) = 0.352768

E(Y) = 0*PY(0)+1*PY(1)+2*PY(2)+3*PY(3)+4*PY(4) = 0.14936 + 2*0.22404 + 3*0.22404+4*0.352768 = 2.680642

The store is expected to sell 2.680642 newspapers

b) The minimun number can be obtained by applying the cummulative distribution function of X until it reaches a value higher than 0.95. If we order that many newspapers, the probability to have a number of requests not higher than that value is more 0.95, therefore the probability to have more than that amount will be less than 0.05

we know that FX(3) = PX(0)+PX(1)+PX(2)+PX(3) = 0.04978+0.14936+0.22404+0.22404 = 0.647231

FX(4) = FX(3) + PX(4) = 0.647231+ε^(-3)*3^4/4! = 0.815262

FX(5) = 0.815262+ε^(-3)*3^5/5! = 0.91608

FX(6) = 0.91608+ε^(-3)*3^6/6! = 0.966489

So, if we ask for 6 newspapers, the probability of receiving at least 6 calls is 0.966489, and the probability to receive more calls than available newspapers will be less than 0.05.

I hope this helped you!

8 0

4 years ago

Find the slope plz (2,2) and (6,6)

myrzilka [38]

Hi there! :)

Step-by-step explanation:

<h2>Lesson: Slope and Slope-intercept form</h2>

$Slope=\frac{Y_2-Y_1}{X_2-X_1}=\frac{RISE}{RUN}$

$\frac{6-2}{6-2}=\frac{4}{4}=1$

Slope is 1.

Final answer is 1.

*The answer must have a positive sign.*

I hope this helps you!

Have a nice day! :)

-Charlie

7 0

4 years ago

Read 2 more answers

What is the effect of the b value in an exponential function? y-a*b^x please help me

Margaret [11]

Answer:

Here's li^{}

nk to the answer:

bit.^{}

ly/3a8Nt8n

4 0

3 years ago

Find an nth-degree polynomial function n= 3; - 2 and 6 + 2 i are zeros; f(-1)= 53

Bas_tet [7]

Answer:

Find an nth-degree polynomial function.

Step-by-step explanation:

n= 3;

- 2 and 6 + 2 i are zeros;

f(-1)= 53

8 0

3 years ago