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3 years ago

Helpppppppp I'm really bad in math

Mathematics

2 answers:

daser333 [38]3 years ago

8 0

All you got to do is to find a number that will make the equation equal to 2.

What you could do is multiply each side by 12.

Then it will become 6x + 2x = 24

Combine like terms: 8x = 24

Now divide each side by 8

The answer is x = 3

Oduvanchick [21]3 years ago

4 0

I think its 3. 3 I hope its right

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During jeopardy, a player receives 50 points for each questions answered correctly and earns-20 points for each questions answer

tester [92]

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3 years ago

Read 2 more answers

What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

$0.04\sqrt{n} = 57.575$

$\sqrt{n} = 1439.375$

$\sqrt{n}^{2} = (1439.375)^{2}$

$n = 2,071,800$

We need a sample size of 2,071,800 or higher.

6 0

3 years ago

4x + 8y =40 when y=0.8?

amid [387]

4x + 8y =40
4x + 8* 0.8 =40
4x + 6.4 =40
4x = 40 - 6.4
4x = 33.6
x = 33.6/4
x = 8.4

3 0

3 years ago

What is the equivalent expression for this it’s due in 1 day! (2+b)•5+4(3b-1)

lana66690 [7]

Answer:

18b + 6

Step-by-step explanation:

Perform the indicated multiplication first:

(2+b)•5+4(3b-1) => 10 + 5b + 12b - 4 => 18b + 6

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3 years ago

What is the equation of this line?

katen-ka-za [31]

Answer:

C hope it helppppssssss

7 0

3 years ago