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3 years ago

My equation is - 3 = X + 8

Mathematics

2 answers:

Crank3 years ago

8 0

X would equal -11
Hope this helps!

My name is Ann [436]3 years ago

7 0

Answer:

X=-11

Step-by-step explanation:

Isolate the varible. Substract 8 on both sides to get X equals -11

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A school has 20

motikmotik

Answer:

One forth of 20 is 5, so there are 5 kindergarten and first grade classrooms.

5 x 2 is 10 so there are 10 second and third grade classrooms.

10 + 5 is 15.

20 - 15 is 5.

There are 5 forth and fifth grade classes.

Step-by-step explanation:

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3 years ago

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please help me i need to submit my math test on 9:59am please help me i really really need help please

Alex Ar [27]

Answer:

7.1 in

Step-by-step explanation:

use the pythagorean theorem

3.1^2+6.4^2=c^2

9.61+40.96=50.57

***IMPORTANT remember to square root the answer you get. it will still be in c^2 form. so 50.57 wouldn't be the real answer, and instead would be 7.1

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3 years ago

A news station would like to conduct an exit poll to determine the likelihood that a highly debated amendment will receive enoug

vladimir1956 [14]

Answer:

The expression is $n = (\frac{1.645*0.5}{0.03})^2$

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

What expression would give the smallest sample size that will result in a margin of error of no more than 3 percentage points?

We have to find n for which M = 0.03.

We have no prior estimate for the proportion, so we use $\pi = 0.5$ . So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.645\sqrt{\frac{0.5*0.5}{n}}$

$0.03\sqrt{n} = 1.645*0.5$

$\sqrt{n} = \frac{1.645*0.5}{0.03}$

$(\sqrt{n})^2 = (\frac{1.645*0.5}{0.03})^2$

$n = (\frac{1.645*0.5}{0.03})^2$

The expression is $n = (\frac{1.645*0.5}{0.03})^2$

3 0

3 years ago

6 x 10^-2 is how many times a large as 2 x 10^-8?

Diano4ka-milaya [45]

Answer:

the number $6\,\,\,10^{-2}$ is three million times larger than $2\,\,\,10^{-8}$

Step-by-step explanation:

To answer this, just do the quotient of the first one over the second one, and use the rules for quotient of exponential expressions of the same base:

$\frac{6\,\,\,10^{-2}}{2\,\,\,10^{-8}} =\frac{6}{2} \,\frac{10^{-2}}{10^{-8}} =3\,\,\,10^{-2+8}=3\,\,\,10^6=3000000$

So the answer is: the number $6\,\,\,10^{-2}$ is three million times larger than $2\,\,\,10^{-8}$

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3 years ago

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what is the slope intercept form of the equation of the line that passes through the points (9, 5) and (4, 1)

Morgarella [4.7K]

The slope is 4/5 if your points are between (9,5) and (4,1)

5 0

4 years ago