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victus00 [196]
3 years ago
15

Examine the equation. –2(–x + 9) = 2(x – 9) 2x – 18 = 2x – 18 This equation has

Mathematics
2 answers:
kolezko [41]3 years ago
6 0

Answer:

infinite solutions

Step-by-step explanation:

Jet001 [13]3 years ago
6 0

Answer:

infinite many solutions.

Step-by-step explanation:

I got it correct in edge

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In a random sample of 18 families, the average weekly food expense was $95.60 with a sample standard deviation of $22.50. Determ
shepuryov [24]

Answer:

t-distribution should be used to construct a confidence interval.

Step-by-step explanation:

We are given that a random sample of 18 families, the average weekly food expense was $95.60 with a sample standard deviation of $22.50.

We have to determine whether a normal distribution (Z values) or a t- distribution should be used or whether neither of these can be used to construct a confidence interval.

<em><u>Since in this question we are provided with;</u></em>

Sample average weekly food expense, \bar X = $95.60

Sample standard deviation, s = $22.50

Sample of families, n = 18

The distribution that we will use here to construct a confidence interval will be <u>t-distribution</u> because in the question we don't know anything about population standard deviation (\sigma) .

Normal distribution is used when we know population standard deviation (\sigma).

So, the pivotal quantity for confidence interval that will be used is One-sample t-test statistics;

                P.Q. = \frac{\bar X -\mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1

Therefore, t-distribution should be used to construct a confidence interval.

3 0
3 years ago
60 minutes is 20% of<br> minutes.
PilotLPTM [1.2K]

Answer:

60 minutes is 20% of 300 minutes

Step-by-step explanation:

let x be the number of total minutes

60 = 20% of x

20% = 1/5

60 = 1/5x

multiply both sides by 5

300 = x

x = 300 minutes

8 0
3 years ago
Which of the following is an example of a variable expense?
olganol [36]

Answer:

Step-by-step explanation:

Rent, wages and car insurance don't vary much.  Grocery expenses depend upon the particular groceries purchased each time one goes to the grocery store, and are least likely to be steady / constant from week to week.

3 0
3 years ago
Two coins and a number cube are tossed at the same time. What is the approximate probability that the coins show different sides
Wewaii [24]
0.17
tell me if i am right

7 0
3 years ago
Read 2 more answers
Solve. -1/2 + (3/4 x 4/9)
max2010maxim [7]
-0.16666666666 which equals -1/16.
4 0
3 years ago
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