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lana66690 [7]
3 years ago
10

4 x 2 -3= equals what.

Mathematics
2 answers:
kompoz [17]3 years ago
7 0

Answer:

5

Step-by-step explanation:

4 x 2 - 3 =

8 - 3 =

5

First you'd do 4 x 2 = 8 from the 8 you use the remaining 3  and subtract

yaroslaw [1]3 years ago
4 0

Answer:

5

Step-by-step explanation:

4 x 2 - 3 =

8 - 3 =

5

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An environmental group conducted a study to determine whether crows in a certain region were ingesting food containing unhealthy
nydimaria [60]

Part A

Given info:

  • xbar = sample mean = 4.90 ppm
  • s = sample standard deviation = 1.12 ppm
  • n = 23 = sample size

Because n > 30 is not true, and we don't know the population standard deviation (sigma), this means we must use a T distribution.

The degrees of freedom here are n-1 = 23-1 = 22.

At 90% confidence and the degrees of freedom mentioned, the t critical value is roughly t = 1.717

Use a T distribution table or calculator to determine this. If you don't have a calculator for the task, then you can search out "inverse T calculator" and there are tons of free options to pick from.

The margin of error E is

E = t*s/sqrt(n)

E = 1.717*1.12/sqrt(23)

E = 0.400982

This is approximate and accurate to 6 decimal places.

The confidence interval is going to be xbar plus or minus that E value

L = lower bound = xbar - E = 4.90 - 0.400982 = 4.499018 = 4.50

U = upper bound = xbar + E = 4.90 + 0.400982 = 5.300982 = 5.30

The confidence interval in the format of (L, U) is (4.50, 5.30)

You could also express it as the format L < mu < U and it would be 4.50 < mu < 5.30; however, I'll stick to the first method.

<h3>Answer:  (4.50, 5.30)</h3>

=====================================================

Part B

Since we know sigma = 2.6 is the population standard deviation, we can use a Z distribution now.

At 90% confidence, the z critical value is roughly 1.645; use a table or calculator to determine this.

n = \left(\frac{z*\sigma}{E}\right)^2\\\\n \approx \left(\frac{1.645*2.6}{0.03}\right)^2\\\\n \approx 20325.254444 \\\\

Round this up to the nearest integer to get 20326. For min sample size problems, <u>always</u> round up.

<h3>Answer: 20326</h3>
6 0
2 years ago
What is when you divide 33-55 divide by 11 will egual
SVETLANKA909090 [29]
So if you means 33-55=-22
-22/11=x

so when dividing by a negative, just divide as usual, but just make the answer negative so

-22/11=22/11 times -1/1=2 times -1=-2

the answer is -2
8 0
3 years ago
I need help pleeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaseeeeee
UkoKoshka [18]

Answer:

3 option is correct

Step-by-step explanation:

because all the domains and ranges calculation matches in eqn 3

3 0
3 years ago
No rush but what is the formula for finding the area of a polygon
Sever21 [200]

Answer: To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem.

Step-by-step explanation:

6 0
3 years ago
How do you round 17.92 to the tens
Talja [164]
17.92 
     ∧ ∧ this is the ones place  
      this is the tens place 

if the ones place is lower then 5 you keep the tens the same. if the ones place is higher then 5 you round the tens place up one. so the answer is 17.90 

4 0
3 years ago
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