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3 years ago

(20+.5x)+.15(20+.5x)how do you work this question out

1 answer:

6 0

Distribute the .15 on the right side to get:
20 + .5x + 3 + .075x

Then, combine like terms (add numbers together and add x terms together):
.575x + 23

...and that's your final answer!

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I NEED HELP PLEASE! ;0

Fittoniya [83]

Answer:

4:6 or 2:3

Step-by-step explanation:

Since the ratio of mass of oxygen to carbon is 4:3, when there are two carbons the ratio will be 4:3*2=4:6=2:3. Hope this helps!

8 0

3 years ago

What is the sum? Complete the equation. -1 5/6+(-1/3)=

Sergeu [11.5K]

Answer:

-2 1/6

Step-by-step explanation:

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3 years ago

Read 2 more answers

A researcher is interested in estimating the mean blood alcohol content of people arrested for driving under the influence. Base

UNO [17]

Answer:

We need a sample size of at least 650

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

Now, 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 of size at least n

n is found when $M = 0.005, \sigma = 0.065$

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

$0.005 = 1.96*\frac{0.065}{\sqrt{n}}$

$0.005\sqrt{n} = 1.96*0.065$

$\sqrt{n} = \frac{1.96*0.065}{0.005}$

$(\sqrt{n})^{2} = (\frac{1.96*0.065}{0.005})^{2}$

$n = 649.23$

Rounding up

We need a sample size of at least 650

7 0

3 years ago

Can you help me plz do it asap

Nina [5.8K]

The answer is (-4,-3)

6 0

2 years ago

F = 4GD – m^3D solve the equation for D. can someone please solve ASAP.

Scorpion4ik [409]

Answer:

D= f/4G-m3

Step-by-step explanation:

I believe this is it but I'm not quite sure.

you should ask a tutor as well.

6 0

3 years ago