Mathematics College

prove that cos130°+cos110°+cos10°=0​

Answers

Answer 1

Answer:

Use the formula cosC+cosD:2cos(C+D/2)cos(C-D/2) Use this in the question: 2cos(10+110/2)cos(10-110/2)+cos130=0 2cos60°cos(-50°)+cos130°=0 2×1/2.cos50+cos130=0 cos50+cos130=0 2cos(50+130/2)cos(50-130/2)=0 2cos90.cos40=0 2×0.cos40=0 0=0 H.P

Step-by-step explanation:

Answer 2
I hope this will help you!
Prove That Cos130+cos110+cos10=0

Related Questions

Jacob won 62 super bouncy balls playing
horseshoes at the county fair. At school he
gave two to every student in his math class. He only has 2 remaining. How
many students are in his class?

Answers

Answer:

30

Step-by-step explanation:

62 = 2x + 2

62 - 2 = 2x

60 = 2x

x = 30

Assuming the lines are evenly spaced between the integers, what number, in decimal notation, is represented by the plotted point?

Answers

Answer:

-1.4

Step-by-step explanation:

There are five increments between -2 and -1, so we find the difference between -2 and -1, which is 1. Divide 1 by five (increments)=.2

This means that every increment is worth 0.2.

If we see it from the left to right, from -2, there are 3 increments to the right, so multiply three by 0.2 which is 0.6, add 0.6 to -2, which is -1.4.

Hope this helps!

Evaluate -x+23y if x=9 and y=2

Answers

Answer:

The answer is 37

x2 - 4x + y2 - 21 = 0 The equation in standard form is​

Answers

Standard Form:
(X - 2)2 + y2 = 25

Jennifer deposits $80 into an investment account with a rate of 4%, compounded annually. The equation y = 80(1 + 0.04)x can be used to determine the number of years, x, it takes for Jennifer’s balance to reach a certain amount of money, y. Jennifer graphs the relationship between time and money. What is the y-intercept of Jennifer’s graph?

(0, 80)
(0, 0)
(80, 80)
(80, 0)

Answers

Answer:the answer is A: (0,80)

Step-by-step explanation:

The dimensions of a drawer are:
height = 2x + 3 inches, length 52 + 2 inches and
width 3x – 2 inches. What is the volume of the drawer?

Answers

Answer:

Hope you find the help you need on this sorry , i couldnt find the answer :( good luck !!

Step-by-step explanation:

The length of a football playing field is 100 yards between the opposing goal lines. What is the length of the football field in feet? Use the conversion equivalency of 3 feet = 1 yard.
a.
33.3 feet
b.
300 feet
c.
200 feet
d.
600 feet

Answers

Answer:

33.3

Step-by-step explanation:

100 divided by 3

A line passes through (-6, 10) and (4, -10). What is the slope?

Answers

m= -2 , hope this help you <3

Find the percent increase from 85 to 125

Answers

Answer: 47.06

Step-by-step explanation: math

Please help me with this question

Answers

Answer:

The answer would be C

Step-by-step explanation:

The reason it is C, is because, if you add 13 to 3, you would get 16. Then, by dividing that by 2, you would get the desired answer of 8.

Answer:

c

Step-by-step explanation:

I just know because I worked it out on paper

ANSWER WUICK WILL.MARK BRANLIEST The ratio of North American Butterflies to South American butterflies at a butterfly park is 8:5. The ratio of
South American butterflies to European butterflies is 5:2. There are 80 North American butterflies at the
butterfly park.
How many european butterflies are there

Answers

Answer:

20 butterflies

Step-by-step explanation:

80:50=8:5

50:20= 5:2

20 european butterflies

A company makes cylindrical candles by melting wax and putting into 3 inch diameter cylindrical jars one block of candlewax with a volume of 360 in.³ is used to make a box of 10 identical candles

Answers

I believe the answer is 1in

Answer: I said 1 inch. I am not 100% sure.

Step-by-step explanation:

For integers a, b and k, we know that a >12, b > 20 and a < b. If b=7k, what is the value of k ?

Answers

This question is incomplete, the complete question is;

For integers a, b and k, we know that a > 12, b < 20 and a < b. If b=7k, what is the value of k ?

Answer: the value of k = 2

Step-by-step explanation:

Given that;

a > 12

b < 20

a < b

If b = 7k

Now if k = 1      {b = 7k = 7}

b would be equal to 7 but b has to be greater than 20

IT CANT BE

if k = 2        { b = 7k = 14}

b would be equal to 14, a is greater than 12, b has to be less than b; 14 < 20,

a has to be less than than b ( 12 < 14 )

IT IS

if k = 3      {b = 7k = 21}  

b would be equal to 21, so b is greater than 20 and a is less than 21

IT CANT BE

Therefore the value of k = 2

Geometry Special Quadrilaterals show work please

Answers

Answer:

a = 16

w = 125

x = 120

y = 55

Step-by-step explanation:

FINDING 'a'

31 = a + 46 / 2

62 = a + 46

16 = a

FINDING 'w'

* This section looks Non-Isosceles trapezoid so I will be following the rule according it

w + 55 = 180

w = 125

FINDING 'y'

y = 55

- Because of corresponding angles

FINDING 'x'

* In this case it looks like we are still dealing w/ an non-isosceles trapezoid.

x + 60 = 180

x = 120

Hope this helped ^^

(Please inform me of any mistakes or misunderstandings!)

In a survey, 48% of the people questioned said they watch sports on television. Were there more people who said they watch sports or more who said they do not?

Answers

Answer:

more people said they do not watch sports

Step-by-step explanation:

Becasue 52 percent say they dont watch

3d - 5+4d +5=140 how do i solve this i need help

Answers

Answer:

3

−

5

+

4

+

5

=

1

4

0

3d{\color{#c92786}{-5}}+4d+{\color{#c92786}{5}}=140

3d−5+4d+5=140

3

+

4

=

1

4

0

3d+4d=140

3d+4d=140

2

Combine like terms

3

+

4

=

1

4

0

{\color{#c92786}{3d}}+{\color{#c92786}{4d}}=140

3d+4d=140

7

=

1

4

0

{\color{#c92786}{7d}}=140

7d=140

3

Divide both sides of the equation by the same term

7

=

1

4

0

7d=140

7d=140

7

7

=

1

4

0

7

\frac{7d}{{\color{#c92786}{7}}}=\frac{140}{{\color{#c92786}{7}}}

77d​=7140​

4

Simplify

Cancel terms that are in both the numerator and denominator

Divide the numbers

=

2

0

d=20

d=20

Solution

=

2

0

hope it help

Step-by-step explanation:

Answer:

the answer is 20

Step-by-step explanation: combine like terms

7d = 140

then divide

140/7

20

PLEASE HELP ME IN SUPER CONFUSED!
Represent the following sentence as an algebraic expression, where "a
number" is the letter x. You do not need to simplify.
Twice the difference of a number and 3.

Answers

Answer:

x-3*2

Step-by-step explanation:

Pam walks 7/8 of a mile to school. Paul walks 1/2 of a mile to school. How much
farther does Pam walk than Paul?

Answers

Answer:

Pam walks 3/8 of a mile more than Paul

Step-by-step explanation:

1/2 = 4/8

7/8 - 4/8 = 3/8

HELPP this hard IMAO

Answers

Answer:  The answer is 50.24 SQAURE INCHES.

Step-by-step explanation: So this circle is even. 8 up and down. * to the right and left. Now the area needs to be found. If the diameter is 8 inches, your answer should be 50.24 SQUARE INCHES.

-2(7-15)
What is the value of
?
4
O 4
0 -2
O 2
O 4

Answers

The answer to your question is 4

can you find the value x in the f figure​

Answers

Answer:

[tex]x =[/tex] [tex]16\frac{2}{11}[/tex]

Step-by-step explanation:

According to the image, those are verticle angles, so I came up with this equation that can help me solve this problem:

5x+12+6x-10=180

11x+2=180

11x=178

x=[tex]16\frac{2}{11}[/tex]

Which expression is equivalent to -21/4/-2/3​

Answers

Answer:

ummmmmmm

Step-by-step explanation:

c

After spending $19 dollars, Issac had twice as much money as Lara.
If Lara had $27, how much money did Issac have at first?

Answers

Answer:

73

Step-by-step explanation:

yes it is 73dddfmsmxk

In the mid term test Jesse scored 92%,89% and 90%.What was her main score​

Answers

Answer:

100%

Step-by-step explanation:

Answer:

90.3%

Step-by-step explanation:

I think you have a typo. I'm pretty sure you meant mean score. To find the mean, we add up all the values and divide by the number of values. Let's add 92, 89, and 90. That gets us 271. Now, let's divide 271 by 3. That gets us 90.3. That means Jesse's mean score is 90.3%.

How many people will 1 cup of rice serve?

Answers

Answer:

4

Step-by-step explanation:

Answer:

it will serve 3 people!

Step-by-step explanation:

divide 6 by 2!

hope this helped!

for brainliest!

2.
(04.01 LC)

Which of the tables represents a function? (5 points)

Table A
Input Output
5 3
5 2
4 1
Table B
Input Output
1 2
3 2
5 3
Table C
Input Output
0 0
1 2
1 3
Table D
Input Output
4 2
4 3
4 4
Table A
Table B
Table C
Table D

Answers

Table c if I’m wrong I’m so sorry I tried my best

Answer: the awnser is B

Lisa bought 16 1/2 pounds of sand for her
child’s sandbox she was building. What is
this in ounces?

Answers

16.5 pounds converted to ounces is 264oz.

What is the sum of 9.37- 6

Answers

3.37 because the 6 technically has a decimal behind it and so u line up the decimals and subtract

Please Help, and say where u got your answer from?

How does Washington’s request foreshadow a power shift within the American colonies?

Answers

Answer:

Having done everything in his power to secure American independence, Washington decided to retire “from all public employments” after the war. He found true peace back at Mount Vernon and was happy to “move gently down the stream of life until I sleep with my fathers.” Washington’s joyful retirement was interrupted in 1787 when his country called on him again.

Step-by-step explanation:

Hi please help me answer this :)

Explain answer

Will give braisnlt

Answers

Answer:

No solutions

Step-by-step explanation:

No intersections or points that apply for the equations.

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