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Zinaida [17]
3 years ago
15

A rectangle has a length that's 9 inches less than twice it's width the area of the rectangle is 180 square inches. Write and eq

uation that represents the situation.
Mathematics
2 answers:
wlad13 [49]3 years ago
7 0
(x)(2x-9)=180, x is the width, 2x-9 would be the length
Ivahew [28]3 years ago
3 0
9 x 20 =180 that's your answer
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35:42, thats pretty much there all is to it... or 35/42
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A random sample of 11 fields of rye has a mean yield of 20.1 bushels per acre and standard deviation of 7.66 bushels per acre. D
Lady bird [3.3K]

Answer:

17.1≤x≤23.1

Step-by-step explanation:

The formula for calculating the confidence interval is expressed as;

CI = x ± z*s/√n

x is the mean yield = 20.1

z is the 80% z-score = 1.282

s is the standard deviation = 7.66

n is the sample size =  11

Substitute

CI = 20.1 ± 1.282*7.66/√11

CI = 20.1 ± 1.282*7.66/3.3166

CI = 20.1 ± 1.282*2.3095

CI =  20.1 ±2.9609

CI = (20.1-2.9609, 20.1+2.9609)

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hence the required confidence interval to 1dp is 17.1≤x≤23.1

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3 years ago
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Mrac [35]

Answer:

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Step-by-step explanation:

6 0
3 years ago
Carbon-14 dating assumes that the carbon dioxide on Earth today has the same radioactive content as it did centuries ago. If thi
defon

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Step-by-step explanation:

A = A02^(-t/hl)

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Dividing both sides by A0 and taking the logarithm, we get

ln(A/A0) = -(t/hl)ln2

or solving for t,

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note that A/A0 = 0.38

t = -(5715 yrs)[ln(0.38)/ln2]

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2 years ago
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Answer:

Step-by-step explanation:

3x + 3y = -3    given

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