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mestny [16]
2 years ago
6

Farmer Ed has 1.000 meters of​ fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not f

ence the side along the​ river, what is the largest area that can be​ enclosed?
Mathematics
1 answer:
Lady_Fox [76]2 years ago
7 0

Answer:

  1000 m of fence can make a 3-sided enclosure of 125,000 m²

Step-by-step explanation:

Let x represent the length of fence parallel to the river. Then the perpendicular dimension is ...

  width = (1000 -x)/2

and the enclosed area is ...

  area = length×width = (x)(1000 -x)/2

This describes a downward-opening parabola with zeros at x=0 and x=1000. The vertex (maximum) is halfway between, at x=500.

Then the maximum area is ...

  area = (500)(1000 -500)/2 = 125,000 . . . . square meters

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3 years ago
Read 2 more answers
Solve the logarithmic equation. Be sure to reject any value of log (X + 8) = log x + log 8​
swat32

Answer:

x = 8/7

Step-by-step explanation:

log (X + 8) = log x + log 8​

We know that log a + log b = log ab

log (X + 8) = log 8x

Raise each side to base 10

10^log (X + 8) = 10^log 8x

x+8 = 8x

Subtract x from each side​

x+8-x = 8x-x

8 = 7x

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8/7 = 7x/7

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2 years ago
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A teacher claims that the proportion of students expected to pass an exam is greater than 80%. To test this claim, the teacher a
erica [24]

Answer:

z=-1.591

Step-by-step explanation:

Null Hypotheses,

H_0 : p=0.8\\H_a: p>0.80

So we use z-test for one population proportion (right-tailed test)

According to this informaton, we defined that

\alpha=0.05

z_c=1.64 (critical value)

So our Rejection region is R={z:z>1.64}

z=\frac{\bar{p}-p_0}{\sqrt{p_0(1-p_0)/n}} = \frac{0.755-0.8}{\sqrt{0.8(1-0.8)/200}}=-1.591

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6 0
3 years ago
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MakcuM [25]

Answer:

the answer is 80 i think

Step-by-step explanation:

bc dependng on  2lw+2lh+2hw, formula 8 and 10 would be length and width

Lets say

8=width

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3in=height

u would do

2 x l x w   + 2 x l h + 2 x h x w=

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160 +            60       +      48+=

268 is the sa

pls brainliest and more points :0

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Why do you multiply 12 by 3 to find the total number cubes in the bottom 3 layers
BaLLatris [955]

because there are 12 in one layer and there are 3 layers

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3 years ago
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