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elena-s [515]
3 years ago
8

What is the length and width of a rectangle if Area is 20 and perimeter is 20

Mathematics
1 answer:
Anna [14]3 years ago
3 0

Answer: a=5+√5

b=5-√5

Step-by-step explanation:

a=?

b=?

P=20

A=20

P=a*b=20

A=a+b=20

------------------

ab=20

a+b=10

--------

a=10-b

(10-b)b=20

-b²+10b-20=0

b=-10±√100-80/-2

b=-10±√20/-2

b=-10±2√5/-2

b=-10-2√5/-2=5+√55

b=5-√5

a+b=10

a+5-√5=10

a=5+√5

a+5+√5=10

a=5-√5

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Katelyn sells cars at a used car dealer on commission. The car lot pays a 18% commission when the profit on a car is under $400,
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Answer:

She will receive 22% commission

Step-by-step explanation:

18% commission when the profit on a car is under $400

22% when the profit is at least $400 and less than $1,000

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6 0
3 years ago
What equation describes the circle that is centered at (8, 3) and has a radius of 9
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Answer:

<h3> (x-8)²+(y-3)² = 81</h3>

Step-by-step explanation:

The general equation of a circle is expressed as;

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5 0
2 years ago
Do all 6-digit number have 6 addends in their expanded form? Explain
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