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rusak2 [61]
3 years ago
10

How do i find BC? Khan Academy

Mathematics
1 answer:
Brrunno [24]3 years ago
6 0

Answer:

using cos=adjacent/hypotenuse

Step-by-step explanation:

in this case cos(60)=x/4√3

x=cos(60)*4√3

x=3.46

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#2.

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Item 15
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Solve -x=9x by graphing
Inessa05 [86]

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the answer would be 0.

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8 0
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Read 2 more answers
The perimeter of the rectangle is 28 units.
avanturin [10]

The value of w is 5 units

Step-by-step explanation:

Let l be the length of the rectangle

and w be the width

Then

l = 2w - 1

Perimeter = 2(l+w)\\28= 2(2w-1+w)\\28 =2(3w-1)\\28 = 6w -2\\28+2 =6w-2+2\\6w = 30

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\frac{6w}{6} = \frac{30}{6}\\w = 5

Hence

The value of w is 5 units

Keywords: Perimeter, rectangle

Learn more about perimeter at:

  • brainly.com/question/1473992
  • brainly.com/question/1473987

#LearnwithBrainly

3 0
4 years ago
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Plz help ill give you brainlist
GaryK [48]
In terms of diameter (d), the area (A) of a circle is given by
  A = (π/4)d²
For your larger circle ...
  A = (π/4)*(24 km)²
  A = 144π km² . . . . . . . . area of larger circle

For your smaller circle ...
  A = (π/4)*(8 km)²
  A = 16π km² . . . . . . . . . area of smaller circle


The ratio of the two areas is
  (larger area)/(smaller area) = ((π/4)*(24 km)²) / ((π/4)*(8 km)²)
  = (24/8)² . . . . . . . . . . . . π/4, km cancel, so it simplifies to this
  = 3²
  = 9 . . . . . . this many small circles have the same area as the larger circle

Changing km to ft does not change the ratio of areas.
3 0
3 years ago
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