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Rainbow [258]
3 years ago
13

If cos2A= -1/2 then show that cosA=1/2​

Mathematics
1 answer:
alex41 [277]3 years ago
4 0

Step-by-step explanation:

If cos 2A = tan-B, then show that cos 2B = tan-A.

In ABC, prove that

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If the value of y varies directly with x when y=50, x=4. What is the value of y when x=2
den301095 [7]

Answer:

Step-by-step explanation:

The general equation for a direct variation is y = k*x

So your first step (usually) is to find k

y = k x

when x = 4

then y = 50

  • y = k*x
  • 50 = k * 4              Divide by 4
  • 50 / 4 = k*4/4
  • 12.5 = k

Now you can find the value of y when x = 2

  • y = k*x
  • k = 12.5
  • x = 2
  • y = ?

y = 12.5 * 2

y = 25

8 0
3 years ago
Miguel can use all or part of his $25 gift card to make a music purchase. Each song costs $1.50, and there is a $1.00 per accoun
Nataly [62]
1.00 + 1.50m lesss than or equal to 25
6 0
4 years ago
Read 2 more answers
URGENT HELP PLEASE!
KonstantinChe [14]

Answer:

Perpendicular lines (c)

3 0
3 years ago
a large storage container in the shape of a rectangular prism has the dimensions of the following: length 16.5m width 18.2m heig
Zielflug [23.3K]

Answer:

3603 boxes.

Step-by-step explanation:

Rectangular Prism is actually a cuboid.

Volume of cuboid = length * width * height.

It is given that length = 16.5 m,  width = 18.2 m, and height = 12 m. Therefore:

Volume = 16.5 * 18.2 * 12 = 3603.6 cubic meters.

Volume is actually the capacity of the shape. If the box has the volume of 1 cubic meters, then the number of boxes that can fit in the rectangular prism will be:

Number of boxes to be fit = Volume of Large container/Volume of Small Container.

Number of boxes = 3603.6/1 = 3603 boxes.

Therefore, 3603 boxes will fit the rectangular prism and 0.6 cubic meters will be the spare space!!!

4 0
3 years ago
If -3x-8=16 what is the value of -2(x-7)
777dan777 [17]

Answer:

-3x-8=16

-3x = 16+8

-3x = 24

x = 24/-3

x = -8

= -2(x-7)

= -2(-8-7)

= 30

Hope this helps you. Do mark me as brainliest.

4 0
3 years ago
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