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sasho [114]
2 years ago
7

1) Chet gets $12 per week as allowance. .

Mathematics
1 answer:
HACTEHA [7]2 years ago
6 0

Answer:

a = 12w

Step-by-step explanation:

His allowance = 12 x The Number of Weeks

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A geologist examines 14 geological samples for iron concentration. The mean iron concentration for the sample data is 0.181 cc/c
kykrilka [37]

Answer:

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.645*\frac{0.0318}{\sqrt{14}} = 0.0140

The lower end of the interval is the sample mean subtracted by M. So it is 0.181 - 0.0140 = 0.167 cc/m³.

The upper end of the interval is the sample mean added to M. So it is 0.181 + 0.0140 = 0.195 cc/m³.

The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.

3 0
3 years ago
2. Write the equation of the circle in general form
Anon25 [30]
(-1,-2) and (-1,4)
so these have same x values, but different y values, so these are on differnt sidef of circle

distanc between them is 6
6/2=3
radius=3

so move 3 units up from (-1,-2)
(-1,1)
so

if center is (h,k) and radius is r then
(x-h)^2+(y-k)^2=r^2

(-1,1) is center and r=3

(x-(-1))^2+(y-1)^2=3^2
(x+1)^2+(y-1)^2=9
5 0
2 years ago
X/7=-6 so solve for x
IgorC [24]

Answer:x-24

Step-by-step explanation:

Solve for xby simplifying both sides of the equation, then isolating the variable.

4 0
2 years ago
What is the y-intercept for the graph of this line?<br> 3x - 5y= 6
Korvikt [17]

Answer:

y-intercept: (0, -1.2)

Step-by-step explanation:

3 0
3 years ago
Solve the inequality below for z . 5 − 8 ≥ z + 4
Tanya [424]

Answer:

sorry man i need pont

Step-by-step explanation:

7 0
2 years ago
Read 2 more answers
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