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Vadim26 [7]
3 years ago
5

3x+7= x-1 does x = -4?

Mathematics
1 answer:
vaieri [72.5K]3 years ago
8 0
Subtract x from both sides:
(3x - x) + 7 = (x - x) - 1

3x - x = 2x:
2x + 7 = (x - x) - 1

x - x = 0:
2x + 7 = -1

Subtract 7 from both sides:
2x + (7 - 7) = -7 - 1

7 - 7 = 0:
2x = -7 - 1

-7 - 1 = -8:
2x = -8

Divide both sides by 2:
2x / 2 = -8 / 2

2 / 2 = 1:
x = -8 / 2

The gcd (greatest common denominator) of 8 and 2 is 2:
-8 / 2 = 2(-4) / 2x1 = 2/2 x - 4 = -4

x = -4

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3 0
3 years ago
A researcher wants to survey people from different age groups to analyze voting patterns. Which type of survey will best accompl
nordsb [41]

Answer: Stratified sampling


Step-by-step explanation:

Stratified sampling is a random sampling method in which the population is divided into non-coinciding groups are called strata and a sample is picked out by some design within each stratum.

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Thus he will make different groups according to different ages to analyze voting patterns that are called stratum.

Thus, Stratified sampling best accomplish this goal.


6 0
3 years ago
Read 2 more answers
What is the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81?
Marizza181 [45]

Answer: d. 1.3333

Step-by-step explanation:

We know that the standard error of a sampling distribution is given by :-

S.E.=\dfrac{\sigma}{\sqrt{n}}

, where \sigma = Population standard deviation.

n= Sample size.

AS per given , we have

\sigma =12

n=81

Then, the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81 will be :-

S.E.=\dfrac{12}{\sqrt{81}}

=\dfrac{12}{\sqrt{9^2}}=\dfrac{12}{9}\\\\=\dfrac{4}{3}\\\\\approx1.3333

Hence, the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81 is 1.3333.

Thus the correct answer is d. 1.3333 .

6 0
3 years ago
#1: Solve the equation below. 5x + 7 = -3x + 31​
svlad2 [7]

Answer:

x=3

Step-by-step explanation:

You can solve by:

5x+7=-3x-31

adding 3x to each side:

8x+7=31

Subtract 7 from each side:

8x=24

Divide each side by 8:

x=3

That is your answer

Hope this helps!

8 0
2 years ago
Read 2 more answers
Can someone please help me with this
lana [24]

Answer:

its 55

Step-by-step explanation:

you minus 125 from 180 to get 55

4 0
2 years ago
Read 2 more answers
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