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
aleksandrvk [35]
3 years ago
13

I will give brainliest to the best answer to this question: Each year, the Department of Water Works measures the chloride conce

ntration level in the water. The first year, they found the chloride concentration changed by −135 mg/L . It is estimated that the chloride concentration will change −2115 mg/L the next year.
What is the total change that will likely occur in 2 years?

Enter your answer as a simplified mixed number in the box.

______mg/L
Mathematics
2 answers:
Nikitich [7]3 years ago
5 0

The answer is for sure           Answer: - 3  2/3

the two  goes on top of the three

Maslowich3 years ago
4 0

Answer:

The total change that will likely occur in 2 years is =-3\frac{2}{3} mg/L        

Step-by-step explanation:

Given : The first year, they found the chloride concentration changed by -1\frac{3}{5} mg/L .

It is estimated that the chloride concentration will change -2\frac{1}{15} mg/L the next year.

To find : What is the total change that will likely occur in 2 years?

Solution :

The chloride concentration changed by -1\frac{3}{5}=-\farc{8}{5} mg/L in first year.

The chloride concentration will change -2\frac{1}{15}=-\frac{31}{15} mg/L the next year.

The total change that will likely occur in 2 years is

=-\frac{8}{5}+(-\frac{31}{15})

=\frac{-24-31}{15}

=\frac{-55}{15}

=\frac{-11}{3}

In a mixed fraction - =-3\frac{2}{3} mg/L        

You might be interested in
Help!!‼️‼️<br><br> How old am lif 500 reduced by 4 times my age is 256?
Colt1911 [192]
43 mnmmmmm m m m mm m m. character minimum
7 0
3 years ago
Read 2 more answers
Solve the inequality 2x &lt; 6
Dima020 [189]

Answer:

x < 3

Step-by-step explanation:

2x < 6

Divide each side by 2

2x/2 < 6/2

x < 3

8 0
3 years ago
Yeah i dont understand this-
Katyanochek1 [597]
You know each side is 9 meters long, meaning it’s a square. To find perimeter, add up all the sides aka. 9+9+9+9=36. To find the area, multiply one side by the other aka. 9x9 = 81.
7 0
3 years ago
Read 2 more answers
solve the average time for a student to complete this quiz is 24 24 minutes with a standard deviation of 2 minutes. What is the
LuckyWell [14K]

Answer:

The correct answer is "(18, 30) minutes".

Step-by-step explanation:

Mean,

= 24

Standard deviation,

= 2

The range of minutes where 99.7% of individuals completed the quiz will be:

= Mean \pm 3\times Stdev

On substituting the values, we get

= 24 \pm 3\times 2

= 24 \pm 6

now,

= 24-6

= 18

Or,

= 24+6

= 30

i.e., 18 to 30 minutes

3 0
3 years ago
To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil
Debora [2.8K]

Answer:

statistic value t= 5.43

p-value: < 0.00001.

Step-by-step explanation:

Hello!

To obtain information over the corrosion-resistance properties of a certain type of steel conduit a random sample of 45 specimens was taken and buried for two years.

The study variable is:

X: Max. penetration of a steel conduit.

The data of the sample

n= 45

sample mean X[bar]= 53.4

sample standard deviation S= 4.2

The conduits are manufactured to have a true average penetration of at most 50 mills, symbolically: μ ≤ 50

The hypothesis is:

H₀: μ ≤ 50

H₁: μ > 50

α: 0.05

To choose the corresponding statistic to use to study the population mean, the variable must have a normal distribution. There is no available information to check this, so I'll just assume that the variable has a normal distribution and, since the population variance is unknown and the sample is small, the statistic to use is a Student t.

Under the null hypothesis, the critical region and the p-value are one-tailed.

Critical value:

t_{n-1; 1-\alpha } = t_{44; 0.95} = 1.68

Rejection rule:

Reject the null hypothesis when t ≥ 1.68

t= \frac{53.4 - 50}{\frac{4.2}{\sqrt{45} } }

t= 5.43

The calculated value is greater than the critical value, thedecision is to rject the null hypothesis.

p-value:

P(t ≥ 5.43) = 1 - P(t < 5.43) = < 0.00001.

The p-value is less than α so the decision is to reject the null hypothesis.

Since the null hypothesis was rejected, then the population average of the penetration of the conduits specimens is greater than 50 mils. It is not recommendable to use these conduits.

I hope it helps!

4 0
3 years ago
Other questions:
  • Simplify 5( 6-3 ) + 2
    9·2 answers
  • Translate the given statement into a linear equation in the form ax + by = c using the indicated variable names. Do not try to s
    8·1 answer
  • If both the x and y values increase on a line graph, the slope is
    10·2 answers
  • Wich explains why the graph is not a function
    12·1 answer
  • Why is 6/8 greater than 5/8 but less than 7/8?
    15·1 answer
  • A number divided by 7 is 9
    5·2 answers
  • Which term describes this is figure?
    7·1 answer
  • Arrange from least to greatest
    5·1 answer
  • PLEASE HELP! 20 POINTS!An equation was created for the line of best fit from the actual enrollment data. It was used to predict
    6·2 answers
  • The vertices of quadrilateral PQRS are listed.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!