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3 years ago

Please help me answer this math problem...thanks! :)

Mathematics

2 answers:

Brrunno [24]3 years ago

7 0

Answer:

Step-by-step explanation:

the denominators have to be the same so multiply each side by the each other, 1/2x^3-4 × 3x^3-6/3x^3-6 and 3/3x^3-6 × 2x^3-4/ 2x^3-4. multiply the denominator to get 6x^6 + (-24x) +24. Multiply each numerator to get 3x^3-6 - 6x^3-12. and that equals -3x^3+6. giving you both the numerator and denominator

vovangra [49]3 years ago

6 0

Answer:

<h2>OPTION B IS THE CORRECT ANSWER</h2>

Step-by-step explanation:

You might be interested in

Azand sold some books at $44 each and used money to buy some concert tickets at $60 each. He had no money left over after buying

sasho [114]

Answer:

88 $

2 books

Step-by-step explanation:

you have to double 44 to get 88 because you couldn't by a ticket without the second book

then that means you sold two books

5 0

3 years ago

If E(X)=100, E(Y)=120, E(Z) = 130, Var(X) = 9, Var(Y) = 16, Var(Z) = 25, Cov(X, Y)= - 10 Cov(X,Z) = 12, and Cov(Y,Z) = 14, then

vredina [299]

Answer:

(1) -0.833

(2) 0.80

(3) 0.70

(4) 390

(5) 90

(7) 48

Step-by-step explanation:

Given:

E (X) = 100, E (Y) = 120, E (Z) = 130

Var (X) = 9, Var (Y) = 16, Var (Z) = 25

Cov (X, Y) = -10, Cov (X, Z) = 12, Cov (Y, Z) = 14

The formulas used for correlation is:

$Corr (A, B) = \frac{Cov (A, B)}{\sqrt{Var (A)\times Var(B)}} \\$

(1)

Compute the value of Corr (X, Y)-

$Corr (X, Y) = \frac{Cov (X, Y)}{\sqrt{Var (X)\times Var(Y)}} \\=\frac{-10}{\sqrt{9\times16}} \\=-0.833$

(2)

Compute the value of Corr (X, Z)-

$Corr (X, Z) = \frac{Cov (X, Z)}{\sqrt{Var (X)\times Var(Z)}} \\=\frac{12}{\sqrt{9\times25}} \\=0.80$

(3)

Compute the value of Corr (Y, Z)-

$Corr (Y, Z) = \frac{Cov (Y, Z)}{\sqrt{Var (Y)\times Var(Z)}} \\=\frac{14}{\sqrt{16\times25}} \\=0.70$

(4)

Compute the value of E (3X+4Y-3Z)-

$E(3X+4Y-3Z)=3E(X)+4E(Y)-3E(Z)\\=(3\times100)+(4\times120)-(3\times130)\\=390$

(5)

Compute the value of Var (3X-3Z)-

$Var (3X-3Z)=[(3)^{2}\times Var(X)]+[(-3)^{2}\times Var (Z)]+(2\times3\times-3\times Cov(X, Z)]\\=(9\times9)+(9\times25)-(18\times12)\\=90$

(6)

Compute the value of Var (3X+4Y-3Z)-

$Var (3X+4Y-3Z)=[(3)^{2}\times Var(X)]+[(4)^{2}\times Var(Y)]+[(-3)^{2}\times Var (Z)]+[(2\times3\times4\times Cov(X, Y)]+[(2\times3\times-3\times Cov(X, Z)]+[(2\times4\times-3\times Cov(Y, Z)]\\=(9\times9)+(16\times16)+(9\times25)+(24\times-10)-(18\times12)-(24\times14)\\=-230$

But this is not possible as variance is a square of terms.

(7)

Compute the value of Cov (3X, 2Y+3Z)-

$Cov(3X, 2Y+3Z)=Cov(3X,2Y)+Cov(3X, 3Z)\\=6Cov(X, Y)+9Cov(X,Z)\\=(6\times-10)+(9\times12)\\=48$

4 0

3 years ago

5y + 2 – 3(4y) = 0. Solving steps

Novay_Z [31]

Y=2/7::::::::::::::::::::

6 0

3 years ago

Which two integers have a sum of 5 and a product of -6?

inysia [295]

Answer:

-1 and 6

Step-by-step explanation:

We can use trial and improvement for this

Pairs of numbers that have a sum of 5:

2, 3 = 6

1, 4 = 4

0, 5 = 0

-1, 6 = -6

-2, 7 = -14

-3, 8 = -24

-4, 9 = -36

-5, 10 = -50

-1 and 6 have a sum of 5 and a product of -6

7 0

2 years ago

levacccp [35]

Answer:

Step-by-step explanation:

use fuzzy socks, put up a Christmas tree, and wear a Santa hat. Oh and listen to Christmas songs for the whole month

6 0

3 years ago