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3 years ago

What is the coefficient of the variable in the expression 6 - 4x - 8 + 2?

Mathematics

1 answer:

Lana71 [14]3 years ago

4 0

The answer is -4. The coefficient of a variable is the numerical value directly in front of the variable.

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A university surveyed recent graduates of the English department about their starting salaries. Four hundred graduates returned

Dafna1 [17]

Answer: (24755, 25245)

Step-by-step explanation:

Given : Sample size : n= 400

Sample mean : $\overline{x}= \$25,000$

Standard deviation : $\sigma=\$2,500$

Significance level : $\alpha: 1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

The confidence interval for population mean is given by :-

$\overline{x}\pm\ z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=25000\pm(1.96)\dfrac{2500}{\sqrt{400}}\\\\=25000\pm245\\\\=(25000-245,\ 25000+245)=(24755,\ 25245)$

Hence, the 95% confidence interval for the mean salary of all graduates from the English department is (24755, 25245)

8 0

3 years ago

Range of 2.45 3.50 2.89 2.99

REY [17]

Answer:

$\huge\boxed{\mathrm{Range = 1.05}}$

Step-by-step explanation:

<u>Given Data:</u>

2.45 , 3.50 , 2.89 , 2.99

<u>Arrange it in ascending order.</u>

2.45 , 2.89 , 2.99 , 3.50

Range = Highest No - Lowest No.

Range = 3.50 - 2.45

Range = 1.05

6 0

3 years ago

Read 2 more answers

five years ago, sarah's aunt was 4 times older than sarah. if sarah's aunt is 42 years older then sarah, then sarah, how ols is

Nimfa-mama [501]

Answer:

Therefore, Sara’s current age (5 years later) is 19 years old.

Step-by-step explanation:

Let xx be Sara’s age five years ago. Therefore, Sara’s aunt’s age 5 years ago is 4x4x.

The difference in their ages is a constant, no matter how many years have gone by. (Can you see why?)

4x−x=42

3x=42

x=42/3

x=14

14+5=19

Therefore, Sara’s current age (5 years later) is 19 years old.

4 0

2 years ago

Each marble bag sold by Hans's Marble Company contains 8 purple marbles for every 5 green marbles. If a bag has 30 green marbles

gregori [183]

We can set up a proportion since we know the ratio between the # of purple marbles and the # of green marbles.

A ratio is a way to compare two different values: for every 8 purple marbles there are 5 green marbles

<h2> $\frac{8}{5} = \frac{p}{30}$ </h2><h2 /><h2>when we cross multiply, we get 5p = 240 </h2><h2>we divide both sides by 5 to isolate the variable </h2><h2 /><h3><u>There are 48 purple marbles </u></h3>

3 0

4 years ago

Instructions:Type the correct answer in the box.

dolphi86 [110]

I think 10 is the answer

HOPE THIS HELPS

8 0

3 years ago

Read 2 more answers