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2 years ago

Reina and Sam are multiplying (84)5 (73)9.

Mathematics

1 answer:

Brilliant_brown [7]2 years ago

3 0

Answer:

Renia is wrong.

Sam is correct.

Step-by-step explanation:

Renia is wrong because shes adding exponents instead of multiplying them.

Sam is correct because she multiplied the exponents correctly.

Exponents are multiplied not added.

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The market and Stock J have the following probability distributions:

denis-greek [22]

Answer:

1) $E(M) = 14*0.3 + 10*0.4 + 19*0.3 = 13.9 \%$

2) $E(J)= 22*0.3 + 4*0.4 + 12*0.3 = 11.8 \%$

3) $E(M^2) = 14^2*0.3 + 10^2*0.4 + 19^2*0.3 = 207.1$

And the variance would be given by:

$Var (M)= E(M^2) -[E(M)]^2 = 207.1 -(13.9^2)= 13.89$

And the deviation would be:

$Sd(M) = \sqrt{13.89}= 3.73$

4) $E(J^2) = 22^2*0.3 + 4^2*0.4 + 12^2*0.3 =194.8$

And the variance would be given by:

$Var (J)= E(J^2) -[E(J)]^2 = 194.8 -(11.8^2)= 55.56$

And the deviation would be:

$Sd(M) = \sqrt{55.56}= 7.45$

Step-by-step explanation:

For this case we have the following distributions given:

Probability M J

0.3 14% 22%

0.4 10% 4%

0.3 19% 12%

Part 1

The expected value is given by this formula:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And replacing we got:

$E(M) = 14*0.3 + 10*0.4 + 19*0.3 = 13.9 \%$

Part 2

$E(J)= 22*0.3 + 4*0.4 + 12*0.3 = 11.8 \%$

Part 3

We can calculate the second moment first with the following formula:

$E(M^2) = 14^2*0.3 + 10^2*0.4 + 19^2*0.3 = 207.1$

And the variance would be given by:

$Var (M)= E(M^2) -[E(M)]^2 = 207.1 -(13.9^2)= 13.89$

And the deviation would be:

$Sd(M) = \sqrt{13.89}= 3.73$

Part 4

We can calculate the second moment first with the following formula:

$E(J^2) = 22^2*0.3 + 4^2*0.4 + 12^2*0.3 =194.8$

And the variance would be given by:

$Var (J)= E(J^2) -[E(J)]^2 = 194.8 -(11.8^2)= 55.56$

And the deviation would be:

$Sd(M) = \sqrt{55.56}= 7.45$

8 0

3 years ago

Identify the equation in slope-intercept form for the line that contains points (3,−10) and (6,5).

BartSMP [9]

Answer:

the answer is 5... 5- (-10) and 6-3 and divide the change by 15 and 3 and you'll get 5

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

7x+8x(9y-) respondaa por favorzinho

poizon [28]

Answer:

7x+72xy

Step-by-step explanation:

7x+8x(9y)=7x+72xy

3 0

2 years ago

Read 2 more answers

The points (-4, 3) and (4, r) lie on a line with slope 1/2<br> Find the missing coordinate r.

melisa1 [442]

Answer:

Step-by-step explanation:

8 units separate -4 and 4

8 divided by 2 (which is the x of slope) is four

Four times 1 (which is y of slope) equals four

3+4 equals seven

(4,7)

7 0

3 years ago

For which value of a does the following system of equations have no solution? -x+6y=7 , -5x+10ay=32

dlinn [17]

Remark

If the lines are parallel, there are no solutions to the system of equations. Start with the equation you know the most about.

x + 6y = 7 Subtract x from both sides

x - x + 6y = 7 - x Combine

6y = - x + 7 Switch and divide by 6

y = -x / 6 + 7/6

The general equation for a line is y = mx + b where m is the slope of the line.

m = - 1/6

================

Now look at the second equation

10ay - 5x = 32 Add 5x to both sides

10ay = 5x + 32 Divide by 10a

y = (5/10a)x + 32/(10a)

===============

Now you must make

5/10a = - 1/6 Cross Multiply

5* 6 = - 10a * 1

30 = - 10a Divide by - 10

a = 30 / - 10

a = - 3

So these two equations will have no solution when a = - 3

8 0

3 years ago