All categories

3 years ago

Use Cramer’s rule to solve the linear system 5x + 10y = 70 5x + 25z =270 10y + 25z=300

Mathematics

1 answer:

blondinia [14]3 years ago

7 0

Answer:

x= 4

y= 5

z= 10

Step-by-step explanation:

(x,y,z)=(4,5,10)

You might be interested in

Which expression is equivalent to -30 - (8)

kirill [66]

Answer:

Any equation that has an answer of -38

Step-by-step explanation:

6 0

3 years ago

When a baseball player hits a homerun the baseball receives a greater impulse?

Marina CMI [18]

<span>During a baseball game, when the player hits a homerun the ball does not receive a greater impulse because the momentum gained does not convert to greater impulse verse that exerted on the actual bat itself. The physics behind momentum do would not justify greater impulse on the baseball.</span>

6 0

3 years ago

A true-false quiz with 10 questions was given to a statistics class. Following is the probability distribution for the score of

disa [49]

Answer:

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

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

Step-by-step explanation:

For this case we assume the following probability distribution:

X 5 6 7 8 9 10

P(X) 0.05 0.15 0.33 0.28 0.12 0.07

First we need to find the expected value (first moment) and the second moment in order to find the variance and then the standard deviation.

In order to calculate the expected value we can use the following formula:

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

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

In order to find the standard deviation we need to find first the second moment, given by :

$E(X^2)=\sum_{i=1}^n X^2_i P(X_i)$

And using the formula we got:

$E(X^2)=(5^2 *0.05)+(6^2 *0.15)+(7^2 *0.33)+(8^2 *0.28)+ (9^2 *0.12 +(10^2 *0.07))=57.46$

Then we can find the variance with the following formula:

$Var(X)=E(X^2)-[E(X)]^2 =57.46-(7.48)^2 =1.5096$

And then the standard deviation would be given by:

$Sd(X)=\sqrt{Var(X)}=\sqrt{1.5096}=1.229$

5 0

4 years ago

Read 2 more answers

Graph the following word problem and then write an equation: Jamal started with $4 in his savings and makes an additional $3 per

Yakvenalex [24]

Answer:

use desmos

Step-by-step explanation:

put y=3x+4 and make a graph from that its really helpful trust me

8 0

3 years ago

I need help plss!! I don’t understand

MA_775_DIABLO [31]

Since it says what the area of the circle is, you need to work the problem backwards from finding the area. So it would be 100 ÷ 3.14 = 31.84 that is the radius. Next you need to find the diameter, so 31.84 × 2 = 63.68. Now you multiply 63.68 × 3.14 = 199.95, round that to 200, divide 200 ÷ 2 = 100 ÷ 2 = 50 miles

Answer= 50 miles

4 0

3 years ago