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mafiozo [28]
3 years ago
8

Calculate the area of triangle ABC with altitude CD, given A(6,-2) B(1,3) C(5,5) D(2,2)

Mathematics
1 answer:
Vikki [24]3 years ago
6 0
The area will be half the product of the lengths of AB and CD.

|AB| = √((6-1)² +(-2-3)²) = 5√2
|CD| = √((5-2)² +(5-2)²) = 3√2

Area = (1/2)*(5√2)*(3√2) = (1/2)*(15*2) = 15

The appropriate choice is ...
  D: 15 square units
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If it takes you 40 minutes to go 20 miles downstream and then 60 minutes on the way back, what is the speed of the current?
IrinaK [193]

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Speed of Current = 5 miles per hour

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We know distance formula,

D = RT

Where

D is distance

R is rate

T is time

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and

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D = RT

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60x - 60c = 20

Multiplying first equation by 60, we get:

60 * [40x + 40c = 20] = 2400x + 2400c = 1200

Multiplying second equation by 40, we get:

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2400x + 2400c = 1200

2400x - 2400c = 800

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

4800x = 2000

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Speed of Current = 1/12 miles per minute

Since there is 60 minutes in an hours, that would be:

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3 years ago
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Answer:

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57/100 + 3/10

they need common denominators so a common denominator is 100

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57/100 + 30/100 which is 87/100

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