1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nalin [4]
3 years ago
6

Solutions to these equations??

Mathematics
2 answers:
madam [21]3 years ago
5 0
1)x= +3, -3
2)x= +8, -8
3)x= 2
Akimi4 [234]3 years ago
3 0
X = 4.5
x^2=64, X = 7
x=2
You might be interested in
What is 1 ten more than 9 ones
Evgesh-ka [11]
19 because 1 ten = 10 ones and 9 one plus 10 ones equals 19 altogether
6 0
3 years ago
The owner of Matt’s Gas Station wants to study gasoline purchases of customers at his station. In 2017, the mean amount of gas
gulaghasi [49]

Answer:

Step-by-step explanation:

a) We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

For the null hypothesis,

µ = 9

For the alternative hypothesis,

µ ≠ 9

This is a 2 tailed test

Since the population standard deviation is given, z score would be determined from the normal distribution table. The formula is

z = (x - µ)/(σ/√n)

Where

x = sample mean

µ = population mean

σ = population standard deviation

n = number of samples

From the information given,

µ = 9

x = 9.9

σ = 2.5

n = 50

z = (9.9 - 9)/(2.5/√50) = 2.55

Looking at the normal distribution table, the probability corresponding to the area above the z score is 1 - 0.99461 = 0.00539

Recall, population mean is 9

The difference between sample sample mean and population mean is 9.9 - 9 = 0.9

Since the curve is symmetrical and it is a two tailed test, the x value for the left tail is 9 - 0.9 = 8.1

the x value for the right tail is 9 + 0.9 = 9.9

These means are higher and lower than the null mean. Thus, they are evidence in favour of the alternative hypothesis. We will look at the area in both tails. Since it is showing in one tail only, we would double the area. We already got the area above the z score as z = 0.00539

We would double this area to include the area in the left tail of z = - 2.55. Thus

p = 0.00539 × 2 = 0.01078

Since alpha, 0.01 < 0.01078, we would reject the null hypothesis

But we are told to use the critical value approach, then

Since α = 0.01, the critical value is determined from the normal distribution table.

For the left, α/2 = 0.01/2 = 0.005

The z score for an area to the left of 0.005 is - 2.575

For the right, α/2 = 1 - 0.005 = 0.995

The z score for an area to the right of 0.995 is 2.575

In order to reject the null hypothesis, the test statistic must be smaller than - 2.575 or greater than 2.575

Since - 2.55 > - 2.575 and 2.55 < 2.575, we would reject the null hypothesis. This corresponds to our previous decision.

b) we would assume normal distribution because the sample size is sufficiently large and the population standard deviation is known.

c) Confidence interval is written in the form,

(Sample mean ± margin of error)

Since the sample size is large and the population standard deviation is known, we would use the following formula and determine the z score from the normal distribution table.

Margin of error = z × σ/√n

The z score for confidence level of 99% is 2.58

Margin of error = 2.58 × 2.5/√50 = 0.91

Confidence interval = 9.9 ± 0.91

The lower end of the confidence interval is

9.9 - 0.91 = 8.99

Therefore, p = 9 will be contained in the interval.

4 0
3 years ago
I need help..... I don't understand at all
cluponka [151]
I think you have to estimate to a whole so 2 1/2 would be 3
8 0
3 years ago
Read 2 more answers
What is the sum of 5.3 x 10^5 and 3.8 x 10^4 in scientific notation?
Sedaia [141]
5.3×10^5=53×10^4
53×10^4+3.8×10^4
=56.8×10^4
=5.68×10^5. Hope it help!
3 0
3 years ago
Read 2 more answers
Help!! For first and second please
jenyasd209 [6]

Answer:

it goes al the way up to 15 and it stops at 5 and the 8 makes the green house

5 0
2 years ago
Other questions:
  • your bedroom is in the shape of a square that is 14 feet long on each side. will a circular rug with a circumference of 50.24 fe
    12·2 answers
  • How to convert fractions?
    10·1 answer
  • A child is running on a moving sidewalk in an airport. When she runs against the sidewalk's motion, she travels 27ft in 9 second
    11·1 answer
  • WHOEVER gives the CORRECT answer FIRST, gets brainliest answer and thanks
    9·2 answers
  • A car travels at an average rate of speed of 40 miles per hour for 5 hours. How far does this car travel?
    9·1 answer
  • Angles A and B are supplementary. If angle A= 137° then angle B is
    15·1 answer
  • Find the area of the region between the curves y=12-x^2 and y=x^2-6
    10·1 answer
  • The sum of two numbers is 45. One number is 4 times and large as the other what are the numbers now
    5·1 answer
  • The quotient of 56 and a number
    7·1 answer
  • A linear equation with one variable, x, can be solved to show that it has no solutions. Which of the following show that there a
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!