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3 years ago

Solve using row operations: 3x – 2y + 5z = - 17 2x + 4y - 3z = 29 5x - 6y - 72 = 7

Mathematics

1 answer:

harina [27]3 years ago

6 0

Solutions on pics

please review if not commet for doubts

The answers are as follows

pic 1 exc 2

pirc 1 exc 1

pic 3 exc3

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If X is a binomial random variable with parameters n and p, what is the expected value of X?

Daniel [21]

Answer:

For this case we know that the random variable of interest would be X and the distribution for X is given by:

$X \sim Bin (n,p)$

And by properties of this distribution the expected value for this case is:

$E(X)= np$

And the variance :

$Var(X)= np(1-p)$

Step-by-step explanation:

For this case we know that the random variable of interest would be X and the distribution for X is given by:

$X \sim Bin (n,p)$

And by properties of this the expected value for this case is:

$E(X)= np$

And the variance :

$Var(X)= np(1-p)$

8 0

3 years ago

Francis gets 6 paychecks in 12 weeks. How many paychecks does she get in 52 weeks?

Darya [45]

First, figure out how long it takes Francis to get one paycheck.
You do this by dividing the number of weeks by the number of paychecks.
12 ÷ 6 = 2
Now, you divide 52 weeks by the time it takes to get one paycheck.
52 ÷ 2 = 26
This means that Francis gets 26 paychecks in 52 weeks.

3 0

3 years ago

if Jeremy drinks 1.5 quarts of coffee every 3 days how many liters of coffee with Jeremy drink in 3 weeks one quart equals .946

Marizza181 [45]

The answer is 9.936706 liters

6 0

3 years ago

Find the area of a regular

lisov135 [29]

$\textit{area of a regular polygon}\\\\ A=\cfrac{1}{2}ap ~~ \begin{cases} a=apothem\\ p=perimeter\\[-0.5em] \hrulefill\\ a=5\\ p=96 \end{cases}\implies A=\cfrac{1}{2}(5)(96)\implies A=240$

8 0

2 years ago

Can someone answer this question please answer it correctly if it’s correct I will mark you brainliest

nikklg [1K]

Answer:

$12

Step-by-step explanation:

Let the original price of bracelet be $ x.

$\therefore \: 6\% \: of \: x \: = \$.72 \\ \\ \therefore \: \frac{6}{100} \times \: x \: = \$.72 \\ \\ \therefore \: x = 0.72 \times \frac{100}{6} \\ \\ \therefore \: x = 0.12 \times 100 \\ \\ \huge \red { \boxed{\therefore \: x = \$12 }}$

Hence, original price of bracelet is $12.

4 0

4 years ago