Mathematics High School

Which expression is equivalent to 2cos2(StartFraction x Over 2 EndFraction) minus cosine (x)?
0
1
1 – 2cos(x)
1 + 2cos(x)

Answers

Answer 1

The expression is equivalent to 1

What is Trigonometry?

Trigonometry is a branch of mathematics that studies relationships between side lengths and angles of triangles.

Given:

2cos²(x/2) - cos(x)

We know

cos x= 2cos²(x/2) + 1

2cos²(x/2) = cos x +1

Then,

2cos²(x/2) - cos(x)

=  cos x +1 - cos x

=1

Learn more about this concept here:

https://brainly.com/question/20851799

#SPJ2

Answer 2

Answer: B.1

Step-by-step explanation:

I did it on edge

Related Questions

If Robin typed 15 characters in 5 seconds, 30 characters in 10 seconds, and
45 characters in 15 seconds, how many characters do you think she would
type in 20 seconds?

A. 50
B. 35
C. 90
D. 60

Answers

Answer:

robin would type D 60 characters in 20 seconds

Jenny earned 86 of a possible 138 points on a test. She lost 2 points for each incorrect answer. How many incorrect answers did she have?

Answers

she had 26 wrong answers

Help this confusing no matter how any times I do it

Answers

Answer:

The variable 8. Equation is 16 + 12x = 112.

Step-by-step explanation:

We know that she spent $16 dollars on magazines, so we can put it in the equation (16 + x= ?). We also know that the total is $112, so we can also add that (16+ x= 112). We don't know how many books she got, but we do know how much they cost (16 + 12x=112. So that makes  the books the variable (X).

To find the variable we need to take out the magazines from the price. 112-16=96. Now we're left with 12x=96. Now all we have to do is divide 96 by 12, which equals 8.

Sorry everything is so long, I tried to make it short as possible

David roller skates 33 miles in 2
3/4 hours. What is his average speed in
miles per hour?

Answers

Answer:

12 miles per hour

Step-by-step explanation:

4/ √ 2 + √ -4
pls help and show work too

Answers

Answer:

2.82842712 + 2 i

Step-by-step explanation:

Figure MNPQR will be reflected across the x-axis to create figure M'N'P'Q'R'. Which rule describes this transformation? A.(x,y) → (-X,Y) B.(x,y)—>(—x,—y) ©. (x,y) → (x,y) D.(x,y) → (x,-y)

Answers

Answer:

D.(x,y) → (x,-y)

Step-by-step explanation:

If it is reflected across the X-axis, then the X variable will stay the same and the Y variable will change.

I hope this helps!! Good luck!!

(Sorry if I'm wrong! It's kinda awkward because it is placed in the second quadrant instead of the first.)

Answer:

its d

Step-by-step explanation:

Determine whether the equation has no solution, one solution, or infinitely many solutions.
-2(11-12x)= -4( 1 -6x)

Answers

Answer: No solution
Because they are parallel lines

Alexia spent 3 minutes working on each of her math problems and 4 minutes on each of her science problems. Her homework took her more than 60 minutes to complete. The boundary line for the inequality 3x + 4y > 60 is shown.

A graph shows number of math problems on the x-axis, from 0 to 20, and number of science problems on the y-axis, from 0 to 16. A dashed straight line has a negative slope and goes through (4, 12) and (12, 6).
Which statement could be true in this situation?

Alexia completed 8 math problems and 9 science problems.
Alexia completed 4 math problems and 6 science problems.
Alexia completed 20 math problems and 10 science problems.
Alexia completed no math problems and 15 science problems.

Answers

Answer:

C

Step-by-step explanation:

Jim is twice Sharon's age together their ages add up to 27. how old is each person?​

Answers

Answer:

Jim is 18, Sharon is 9.

Step-by-step explanation:

Sharon has to be 9. Two times 9 is 18, then add 9 to it for sharons age, and you get 27. hope this helps :)

Answer:

Jim is 18. Sharon is 9.

Step-by-step explanation:

9+9=18

18+9=27

Make Sense and Persevere Paxton, a summer camp counselor, has a budget of $300 to spend on caps and T-shirts for a summer camp.
plz help this is due soon!!!

Answers

Answer:

9 shirts and 10 caps

Step-by-step explanation:

Buying one t shirt costs 20 dollars, and one cap would cost 12 dollars. If Paxton bought one cap and one shirt, that would cost 32 dollars. If we multiply that by 9, we get 288. So Paxton can buy 9 shirts and 9 caps with 288 dollars. Paxton has 12 dollars left, so Paxton can buy one more cap to entirely spend the budget.

Evaluate expression using the order of operations. 17 − 5 ⋅ 4 ÷ 2

Answers

Answer:

7

Step-by-step explanation:

5x4=20

20/2=10

17-10=7

Answer:

your answer is 7

Step-by-step explanation:

17-5×4÷2

P- parenthesis

E- Exponents

M- Multiplication

D- Divide

A- Add

S- Subtract

pls answer will mark brainliest

Answers

Answer:

40 square cm

Step-by-step explanation:

Answer:40 square cm

Step-by-step explanation:

MATH HELP!!!! I HAVE POSTED THIS QUESTION AND NO ONE ANSWERS! 15 POINTS!!!

Answers

Answer:

A

Step-by-step explanation:

in order to find the answer take into mind what the question is asking for.

The equation has to pass the point (12,3) and has to be parallel to y=(4/3)x+5.

since the equations have to be parallel you can take out D since it has the reciprocal of the slope of the original equation.

You could also take out the negative equation C since the original one is not negative.

then you would have to graph the equations and would find that A is the answer because in order to have a point (12,3) you need to either start from the negative y-axis and ascend or from the positive axis and descend but B doesn't go down it goes up since it has a positive y value and has a positive slope. So in conclusion the answer would be A.

[tex]y = \frac{4 }{3} x - 13[/tex]

X^5/6 * x^1/3 can someone please solve this ?

Answers

5/6 +1/3
5/6 +2/6
7/6
X^ 7/6

Evaluate 3.6x + 4.5y when x=3 and y=7

Answers

Answer:

42.3

Step-by-step explanation:

3.6(3)+4.5(7)

10.8+31.5

42.3

Which number can each term of the equation be multiplied by to eliminate the fractions before solving?
-3/4m-1/2=2+1/4m

Answers

Answer: 4

Step-by-step explanation: 4 was the biggest denominator in that equation. so if we multiply by 4 on all the terms, all the denominators will go away. we will not have any more fractions!

Can anyone please help me on this!? I’ll give brainliest!

Answers

Answer

Step-by-step explanation:

-5y-y=??? Algebra. Confused. Help.

Answers

Answer:

-6y

Step-by-step explanation:

-5y-y=-6y

Answer:

-6y

Step-by-step explanation:

Which equation represents the same
linear function as the table below?

Answers

Whatttttt I’m dumb sorry :(

You and your friend go to tacos Galore for lunch. You order 3 soft tacos and 4 burritos and your bill comes out to $18.00. Your friend's bill is $10.00 for two soft tacos and two burritos whats the cost of the soft tacos and the cost of a burrito

Answers

Answer:

Soft Tacos = 2

Burritos= 3

Step-by-step explanation:

You

3 x 2 = 6

18 - 6 = 12

12/4= 3

You spent 6$ on soft tacos and 12$ on burritos.

Your friend

2 x 2 = 4

10-4 = 6

6/2 = 3

Your friend spent 4$ on soft tacos and 6$ on burritos.

I hope I explained this well.

what is an equivalent fraction to 3/8 ​? Find a common denominator for the pair of fractions.​ Then, write equivalent fractions with the common denominator. 3/8 and 9/28

Answers

Answer:

6 1/6

Step-by-step explanation:

A fraction that is equivalent to 3/8 is 6 1/6

PLEASE HELP I WILL GIVE BRAINLIEST!!!!
Solve the following system of equations with any method. Show all work and explain your thinking for each
step in the process.

2x- 10y = 10
Sx+9y =9

Answers

Answer: Let's solve for x.

2x−10y=10

Step 1: Add 10y to both sides.

2x−10y+10y=10+10y

2x=10y+10

Step 2: Divide both sides by 2.

2x

2

=

10y+10

2    answer

    x=5y+5

Step-by-step explanation:

Let's solve for s.

sx+9y=9

Step 1: Add -9y to both sides.

sx+9y+−9y=9+−9y

sx=−9y+9

Step 2: Divide both sides by x.

sx

x

=

−9y+9

x

s=

−9y+9

x

Answer:                         hope this helps:)

s= -9y+9/x

Mark and his friends order two pizzas of the same size .•The first pizza is cut into 6 slices of equal size .•The second pizza is cut into 4 slices of equal size. Each person plans to take 2 slices of pizza. Mark concludes that he would get more pizza by taking 1 slice from each pizza, instead of 2 slices from the first pizza. Explain why Mark is correct. Be sure to include a number comparison by using > or < in you explanation.

Answers

Mark is correct because taking a slice from each pizza would be 3/6 or 1/2 of the pizza but taking two slices of the first pizza, Mark wouldn't get as much because that is the same as 2/6 or 1/3 of the pizza. 1/2 > 1/3 therefore Marks conclusion is correct.

pls help answer quick and do NOT WASTE MY POINTS

Answers

Answer:

points waisted

Step-by-step explanation:

Answer:

Yeah its parallel

Step-by-step explanation:

I would waste your points, but nah. Anyways, its parallel

can any one help me pls I'm not good at math:(
the graph of a function is shown on the grid​

Answers

Answer:

D is the correct answer

Step-by-step explanation:

The coordinates of the x axis is always listed first.

On the x axis the line was less than one and more than zero leaving the fraction as the only option.

hope it helps

have a great day

:)

''The world shall know pain'' Me: Pain or Pain???????????????

Answers

Answer:

PAIN

Step-by-step explanation:

A large cruise ship has 7,436,000 cubic feet of cargo space. Express this
number in scientific notation

Answers

usjakkakakakkabsnsnsns

Answer:

7.436  ×  10 ^6

Step-by-step explanation:

Move the decimal so there is one non-zero digit to the left of the decimal point. The number of decimal places you move will be the exponent on the 10. If the decimal is being moved to the right, the exponent will be negative. If the decimal is being moved to the left, the exponent will be positive.

Hope this helps!

Please mark me as Brainliest!

Find the missing length of the triangle.
C=_Km

Answers

U need to use the a^2+b^2=c^2. So 21^2+ 20^2=___. From there u square root your answer to find the length of the side.

Answer:

c = 29km

Step-by-step explanation:

[tex]A^{2}[/tex] + [tex]B^{2}[/tex] = [tex]C^{2}[/tex]

[tex]20^{2}[/tex] + [tex]21^{2}[/tex] = 841

[tex]\sqrt{841}[/tex] = 29

Please solve and explain, thank you!

Answers

9514 1404 393

Answer:

  44 inches

Step-by-step explanation:

The sides of a rhombus are all the same length, so we have ...

  AB = BC

  3x -4 = 2x +1

  x = 5 . . . . . . . . . add 4-2x

Then the side lengths are ...

  3x -4 = 3·5 -4 = 11

Four of them total 4·11 = 44 inches.

Answer all the questions for a bunch of points, no scam answers please

Answers

Step-by-step explanation:

hold up bro. this doesn't even say what u actualy have to do . or is just so blurry

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