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suter [353]
3 years ago
7

Pls Help asap thx alot ​

Mathematics
1 answer:
Novosadov [1.4K]3 years ago
5 0

Answer: 52.5cm²

Step-by-step explanation:

Firs, you have to split this composite shape into two separate shapes; a rectangle and triangle.

To work out the area of the rectangle you would have to do 8x5=40.

To work out the area you would have to find out the height of it first. So, to do this you would have to do 1+2=3 then do 8-3=5. Now we know the height is 5.

Then you have to use the formula base times height divided by 2 (b×h/2). So 5×5=25 then 25÷2=12.5

To then find the total area of this composite shape you would have to add the two areas together. So 40+12.5=52.5cm²

Hope this helps :)

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Hoped this helped.

~Bob Ross®
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The answer is between B and C.

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A machine produces 3-inch nails. A sample of 10 nails is obtained and the lengths determined. After some calculation, the sample
gtnhenbr [62]

Answer:

<em>The 90% confidence interval for the population mean length of nails produced by the machine.</em>

<em>(2.91562, 3.04438)</em>

Step-by-step explanation:

<u><em>Step:1</em></u>

Given that the size of the sample 'n' = 10

Given that the mean of the sample (x⁻) = 2.98

Given that the standard deviation of the sample (s) = 0.09

Degrees of freedom = n-1 = 10 -1 = 9

t₀.₁₀ = 2.2621

<u><em>Step:2</em></u>

<em>The 90% confidence interval for the population mean length of nails produced by the machine.</em>

(x^{-} - t_{9 , 0.10} \frac{S}{\sqrt{n} } , x^{-} + t_{9,0.10} \frac{S}{\sqrt{n} } )

(2.98 - 2.2621(\frac{0.09}{\sqrt{10} } , 2.98 + 2.262 \frac{0.09}{\sqrt{10} } )

(2.98 - 0.06438 , 2.98 + 0.06438)

(2.91562 , 3.04438)

<u><em>Final answer:-</em></u>

<em>The 90% confidence interval for the population mean length of nails produced by the machine.</em>

<em>(2.91562, 3.04438)</em>

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Answer:

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