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3 years ago

Solve the system of equations. 12x – 5y = -20 y = x +4

Mathematics

2 answers:

Tamiku [17]3 years ago

6 0

The answer should be something like this 7x=0 but if want the whole thing solved it should be x=0

ad-work [718]3 years ago

3 0

Answer:

-6

Step-by-step explanation:

also i think you should use Math-way, it will help with your algebra

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How do you write the number for 3,152,308

Sergeu [11.5K]

If you mean in word form, then it should be as follows;

Three million one hundred and fifty-two thousand three hundred and eight.

If you don't mean word form, you will have to be a little more specific.

8 0

3 years ago

A fashion designer wants to know how many new dresses women buy each year. Assume a previous study found the standard deviation

horsena [70]

Answer:

649

Step-by-step explanation:

Given that

Mean number of dresses is 5.5

Standard deviation of the sample, S.D is 1.3

Margin of error, M.E is 0.1

Level of confidence is 95% or 0.95

The formula for margin of error, M.E is

Z * (S.D/√n) , where

Z = Value for level of confidence which is 1.96

Proceeding further, we have

0.1 = 1.96 * (1.3/√n)

0.1 = 2.548 / √n, making √n subject of formula, we have

√n = 2.548 / 0.1

√n = 25.48, squaring both sides

n = 25.48²

n = 649.23

Therefore the number of sample size we're looking for is n = 649.23, when rounded to the nearest integer, we have it to be 649

4 0

3 years ago

Your investment adviser tells you that Acme Widgets has a 40% chance of increasing your investment by $10,000, and Gimbles Stuff

julsineya [31]

Gimbles Stuff will have the higher expected value.

Explanation: 15,000x0.3= 4,500 whereas 10,000x0.4= 4,000

7 0

3 years ago

Read 2 more answers

18. Population density is the number of people

adelina 88 [10]

The region that covers 23 km^2 has population of 1380 people

Step-by-step explanation:

The population is calculated using population density by multiplying the population density with the area.

Here,

Population density = d = 60 people per kilometer^2

Area = a = 23 km^2

So,

$The\ population\ in\ given\ area = d * a\\=60*23\\=1380\ people$

The region that covers 23 km^2 has population of 1380 people

Keywords: Population, Density

Learn more about population at:

#LearnwithBrainly

7 0

3 years ago

What is the measure of ∠x

scZoUnD [109]

Answer:

∠x = 63°

Step-by-step explanation:

The exterior angle added with the measure of ∠BAC will equal 180, since they will form a straight line, so we can calculate the measure of ∠BAC:

128 + x = 180

x = 52

∠BAC = 52°

The angles in a triangle all add up to 180°, so we can set up another equation to find x:

52 + 65 + x = 180

117 + x = 180

∠x = 63°

5 0

3 years ago