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stellarik [79]
3 years ago
13

Maths help please!!!!!!!!!!!

Mathematics
1 answer:
Vanyuwa [196]3 years ago
6 0

Answer:

Step-by-step explanation:

Remark

Assume all of the sheet of plywood is to be used.

Front and back = 2 * 2x *h

Top and Bottom = 2 * 2x * x

Left/Right side = 2 * x * h

Total area = 4xh + 4x^2 + 2xh

Total area = 6xh + 4x^2

Total area = 600

6xh + 4x^2 = 600

h = (600 - 4x^2)/6x

h = 100/x - 2/3 x

Volume = x * 2x * h

Volume = 2x^2 * (100/x - 2/3 x)

Volume = 200x - 4/3  x^3

I can do this without calculus (I think), but it is much easier to use it.

dV/dx = 200 - 4x^2

This is a maximum when dV/dx = 0

dV/dx = 200 - 4x^2 = 0

4x^2 = 200

x^2 = 50

x = 5√2

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Refer to the previous exercise. The researchers wanted a sufficiently large sample to be able to estimate the probability of pre
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Answer:

<em>The large  sample n = 117.07</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given that the estimate error (M.E) = 0.08

The proportion (p) = 0.75

q =1-p = 1- 0.75 =0.25

Level of significance = 0.05

Z₀.₀₅ = 1.96≅ 2

<u><em>Step(ii):-</em></u>

The Marginal error is determined by

M.E = \frac{Z_{0.05} \sqrt{p(1-p)}  }{\sqrt{n} }

0.08 = \frac{2 X \sqrt{0.75(1-0.75)}  }{\sqrt{n} }

Cross multiplication , we get

\sqrt{n}  = \frac{2 X \sqrt{0.75(1-0.75)}  }{0.08 }

√n = \frac{2 X0.4330}{0.08} = 10.825

squaring on both sides , we get

n = 117.07

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

<em>The large  sample n = 117.07</em>

6 0
2 years ago
7 + r = 15<br><br>A() 22<br><br>B() 8<br><br>C() 105<br><br>D() 9
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Answer:

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Step-by-step explanation:

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Step-by-step explanation: because am big math

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Step-by-step explanation:

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Coordinates of point A cam be written as:

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