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jolli1 [7]
2 years ago
12

cos2x=____. Check all that apply. A. 1-2sin^2 x. B. 2sin^2 x-1. C. sin^2 x-cos^2 x. D. cos^2 x-sin^2 x

Mathematics
2 answers:
g100num [7]2 years ago
7 0
         cos 2 x = cos² x - sin² x = 1 - sin² x - sin² x = 1 - 2 sin² x.
         Answer: A ) 1 - sin² x and D ) cos² x - sin² x 
       
 Thank you.
Gnom [1K]2 years ago
3 0

Answer:

A & D

1-2sin^2x

cos^2x-sin^2x

Step-by-step explanation:

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Leah has two savings accounts with balances totaling $8,000. She withdrew 15% from one and
DedPeter [7]

Answer:930 Hope this Helps :D

Step-by-step explanation:

For the given problem:

Let the balances of the saving accounts be (x) and (y)

Leah has two savings accounts with balances totaling $8,000

so,

x+y=8000 (1)

She withdrew 15% from one and 40% from the other. If she has $6,350 remaining in the accounts

So, The remaining from the accounts will be (1 - 15%) and ( 1 - 40%)

that will give the decimals: 0.85 and 0.6

so, we can write the following equation:

0.85x+0.6y=6350 (2)

Now, solve the equations (1) and (2) to find (x) and (y)

From equation (1)

y=8000-x (3)

Substitute with (y) from equation (3) into equation (2)

0.85x+0.6*(8000)-x =6350

Now solve the equation

0.85x+0.6*8000-0.6x=6350

0.85x-0.6+4800+6350

0.25x=6350-4800

0.25x=1550

x=6200

Substitute with (x) into equation (3) to find (y)

y=8000-6200=1800

So, the larger account = x = 6200

and the smaller account = y = 1800



Now, we will answer the question, how much money did she withdraw from the account with the larger balance?

so, the answer will be: 15% of x = 0.15 * 6200 = 930



So, the answer will be $930

6 0
2 years ago
Given the following system of equations: -4x+8=16, 2x+4y=32 what action was completed to create this new equivalent system of eq
castortr0y [4]

The equation (1) is divided by 2 to create new equivalent system of equations.

Step-by-step explanation:

The given systems of equations are:

-4x+8y=16\,\,\,(1)\\2x+4y=32\,\,\,(2)

Considering 8y instead of 8 in eq(1)

We need to identify  what action was completed to create this new equivalent system of equations? -2x+4y=8, 2x+4y=32

Comparing given equations we came to know that equation(1) is divided by 2 to get the new equation i.e

-4x+8y=16\\Divide\,\,by\,\,2:\\-2x+4y=8

While second equation is same as given.

So, The equation (1) is divided by 2 to create new equivalent system of equations.

Keywords:System of Equation

Learn more about System of Equation at:

  • brainly.com/question/9045597
  • brainly.com/question/13168205
  • brainly.com/question/2115716

#learnwithBrainly

4 0
2 years ago
From a group of six people, two individuals are to be selected at random. how many possible selections are there
Murrr4er [49]
You can do C(6,2) which gives 6*5/2 which is 15!
6 0
3 years ago
Work out m and c for the line: y=3x
Tpy6a [65]

Answer:

m = 3, c = 0

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

y = 3x , or y = 3x + 0 ← is in slope- intercept form

with m = 3 and c = 0

4 0
2 years ago
Find the midpoint of the line segment joining the points (-1,-1) and (-3,12)
maxonik [38]

Answer:

(−2, 11/2)

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
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