All categories

3 years ago

X - y = 4 2x + y = -4 x = y =

Mathematics

1 answer:

Aleks04 [339]3 years ago

8 0

Answer: x = 4 + y

x= -2 - y/2

Step-by-step explanation:add y to both sides of the equation

You might be interested in

What is the integral of y'sinx=ylny ...?

Salsk061 [2.6K]

Y'sinx=ylny, is equivalent to dy / dx (sinx=ylny, and dy sinx=ylny dx
it is similar to dy/ylny = dx/sinx
so integral (dy/ylny = integral dx/sinx)
integral dx/sinx)= Ln{abs value ( tan(x /2 + pi /4)}
integral (dy/ylny= ln(lny)
final answer is lny = {abs value ( tan(x /2 + pi /4)}+C, you can find y, or x

3 0

3 years ago

Suppose that replacement times for washing machines are normally distributed with a mean of 9.3 years and a standard deviation o

Harlamova29_29 [7]

Answer:

The probability is 0.0643

Step-by-step explanation:

* Lets revise some definition to solve the problem

- The standard deviation of the distribution of sample means is called σM

- σM = σ/√n , where σ is the standard deviation and n is the sample size

- z-score = (M - μ)/σM, where M is the mean of the sample , μ is the mean

of the population

* Lets solve the problem

- The mean of the washing machine is 9.3 years

∴ μ = 9.3

- The standard deviation is 1.1 years

∴ σ = 1.1

- There are 70 washing machines randomly selected

∴ n = 70

- The mean replacement time less than 9.1 years

∴ M = 9.1

- Lets calculate z-score

∵ σM = σ/√n

∴ σM = 1.1/√70 = 0.1315

∵ z-score = (M - μ)/σM

∴ z-score = (9.1 - 9.3)/0.1315 = - 1.5209

- Use the normal distribution table of z to find P(z < -1.5209)

∴ P(z < -1.5209) = 0.06426

∵ P(M < 9.1) = P(z < -1.5209)

∴ P(M < 9.1) = 0.0643

* The probability is 0.0643

5 0

3 years ago

What is the value of x? a. 68° b. 62° c. 112° d. 124°

Dmitrij [34]

68 degrees because 56×2=112 then 180-112=68

8 0

3 years ago

Read 2 more answers

You are given: Students must take at least 2 courses out of Art, History, and Science. 60% of the students take Art. 80% of the

Eva8 [605]

Answer:

0.10 or 10%

Step-by-step explanation:

Since each student must take at least 2 courses, if no student took all three courses, the sum of the percentages would total 200% (counting each student twice). Therefore, the proportion of students taking all three courses is the difference between the sum of all percentages and 200%:

$P(3) = 60\%+80\%+70\%-200\%\\P(3) = 10\%$

0.10 or 10% of the students take all 3 courses.

4 0

3 years ago

A submarine was situated 800 feet below sea level. If it ascends 350 feet,

Lesechka [4]

Answer:

450 feet below sea level

Step-by-step explanation:

ascend = move up = add

800 ft below sea level = -800

-800 + 350 = -450

4 0

3 years ago