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
vivado [14]
3 years ago
9

HELP ASAP! PLS!! The Water Department checks the city water supply on a regular basis for

Mathematics
2 answers:
aleksandr82 [10.1K]3 years ago
8 0

Answer:

B. 95% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.5 ppb

Step-by-step explanation:

You are given the total number of samples, the concentration of lead, and the standard deviation. The standard deviation represents how inaccurate the estimation of the concentration of lead in the drinking water. This means that there can only possibly be a 0.3 ppb error in the estimation. 3.2-0.3=2.9, and 3.2+0.3=3.5

Mazyrski [523]3 years ago
7 0

Answer:

99.7% confident the average concentration of PCBs in the water supply is between 2.3 parts per billion and 4.1 parts per billion.

Step-by-step explanation:

Just took the question, this is the correct answer.

You might be interested in
Examples of equivalent mixed numbers
Sloan [31]
2/4 and 1/2

5/10 and 1/2

1/3 and 2/6

40/90 and 4/9
3 0
3 years ago
I need help which triangle theorem do I use for these
irina [24]

Answer:

Step-by-step explanation: B. SSS because it shows us three sides ,C.RHS because it has a right angle, d. AAS because it shows us two sides and a non included side,  e. RHS because it has a right angle,  f. AAS because it has two angles and non included side.

4 0
3 years ago
Harry’s team has won 13 less than 6 times as many games as it has lost. The team lost n games. Which expression could you use to
ad-work [718]

Answer:

A.

Step-by-step explanation:


7 0
3 years ago
A city's population increases by 5% every year. If its population today is 300,000, write a function that models the population
ratelena [41]

Answer:

f(x) = 300,000(1.05)^x

Step-by-step explanation:

Use the exponential growth equation:

f(x) = a(1 + r)^x

Plug in 300,000 as a, since it is the original population:

f(x) = 300,000(1 + r)^x

The city's population is growing at 5% each year, so plug in 0.05 as r:

f(x) = 300,000(1 + 0.05)^x

f(x) = 300,000(1.05)^x

So, the function for the population growth is f(x) = 300,000(1.05)^x

6 0
3 years ago
Help <br><br><br><br><br><br> I need answers
natali 33 [55]

We can easily work out the meter reading in October. It comes out to be 32347 + 972. So the reading in October must be around 33319.

SO the answer to second question is really easy to figure out too. As we know that one unit costs 14 p we can simply multiply the cost with the number of units consumed.

So for 972 units if we multiply by 14 we get the cost to be around somewhere 13608 p.

6 0
3 years ago
Other questions:
  • If two sets are disjoint, then what region represents the union of their complements in a Venn diagram?
    10·1 answer
  • The formula for the volume of a pyramid is V = 1/3 Bh, where B is the area of the base of the pyramid snd h is the height of the
    12·2 answers
  • 5 pens for 14 dollars rounded to the nearest hundred
    6·1 answer
  • How do you simplify 20/30
    14·2 answers
  • Megan has three and 2/3 NERDS ropes to split into 1/5 length pieces. If she shares these pieces with as many friends as possible
    15·1 answer
  • Let A and B be subsets of a universal set U and suppose n(U)=400, n(A)=135, n(B)=80, and n(A n B)=60. Find the number of element
    12·1 answer
  • Order the values from least to greatest. -21/2 -1/2, |1/2|, 1 1/2, |-2|, |-2 1/2|​
    12·1 answer
  • Expand and simplify 4 (x-3)-2 (1-x)
    8·2 answers
  • Plzzzzzzzzzzzzzzzzzzzzzz
    7·1 answer
  • What is the value of e? <br> A. 17 B. 48 C. 136 D. 360
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!