Solve the following quadratic trig equations algebraically (without graphing technology) for the domain 0 ≤ x ≤ 360°. Use exact solutions whenever possible. 6cos2(θ) + cos(θ) - 1 = 0 2 - 2sin2(θ) = cos(θ)Solve the following quadratic trig equations algebraically (without graphing technology) for the domain 0 ≤ x ≤ 360°. Use exact solutions whenever possible. A. 6cos2(θ) + cos(θ) - 1 = 0 B. 2 - 2sin2(θ) = cos(θ)

Answers

Answer 1
I may be wrong, but I believe this would be the answer:
6cos^2(θ) + cos(θ) - 1 = (2cos(θ) + 1)(3cos(θ) - 1) = 0 

cos(θ) ∈ {-1/2, 1/3} 

cos(θ) = -1/2 ⇒ θ ∈ {2π/3, 4π/3} 

cos(θ) = 1/3 ⇒ θ ∈ {Arccos(1/3), 360° - Arccos(1/3)} ≈ {70.53°, 289.47°} 


2cos²(θ) - cos(θ) = cos(θ)(2cos(θ) - 1) = 0 ⇒ 

cos(θ) ∈ {0, 1/2} ⇒ x ∈ {60°, 90°, 270°, 300°}
Hope this helped and have a great day!

Related Questions

A bath tub will hold 1 hectoliter of water. How many liters will it hold?

Answers

1 hectoliter=100 liters!

So the bathtub will hold 100 liters.

Hope this helps!
the answer to this question is 100. hope this helps

Dritown received 0.135 inches of rain in the spring of 2011. Write this decimal as a fraction in simplest form.

A: 7/50
B: 1/8
C: 13/100
D: 27/200

Answers

the calculator says 27/200

Answer:

[tex]\frac{27}{200}[/tex]

Step-by-step explanation:

Dritown received 0.135 inches of rain in the spring of 2011.

Convert 0.135 in fraction form

0.135 can be written as 0.135/1

To remove decimal multiply top and bottom by 1000

[tex]\frac{0.135 \cdot 1000}{1000} =\frac{135}{1000}[/tex]

Divide both top and bottom by 5

[tex]\frac{135}{1000}[/tex] becomes [tex]\frac{27}{200}[/tex]

The sum of 2 and three times a number equals 14. Find the number

Answers

the number is 4
14-2=12
12/3=4
answer in correct fashion
2+3×4=14
Let Y be the unknown number
2 times the number is 2Y
3 times the number is 3Y
The sum of two and three times the number is 14. That is represented as;
2Y+3Y=14
5Y=14
Divide both sides by 5
Y=14/5
Y=2.8
The number is 2.8
Have a nice day

A gardener brought 5 rabbits, after 2 months rabbits became 10, and after 4 months they became 20. If the growth continues on the same ratio, what would be the amount of rabbits after 1 year?
(a) 300 (b) 435
(c) 535 (d) 635

Answers

Answer:

Initial population of Rabbit = 5 rabbit

After 2 months

Population of Rabbit = 10

After 4 months

population of rabbit = 20

Formula for growth is :

G = [tex]G_{0}[1 + R]^n[/tex], where G is final population and [tex]G_{0}[/tex] is initial population, and R is growth rate.

1. 10 = 5 [1 +R]²

Dividing both sides by 5 , we get

2 = (1 + R)²

→ R + 1 = √2  ⇒ taking positive root of 2

→R = √2 -1

Amount of rabbit after 1 year = [tex]20(1 + \sqrt2 -1)^8= 20 \times (\sqrt2)^8= 20 \times 2^4= 20 \times 16= 320[/tex]




The amount of rabbits after 1 year is[tex]\boxed{635}[/tex].

Further explanation:

The terms of the geometric sequence can be written as,

[tex]a,ar,a{r^2},a{r^3}[/tex], ..

Here,   is the first term and   is the common ratio.

If the first term   and the second term   is known then, the value of   can be obtained.

Now, the value of any term can be easily obtained with the help of a and r.

Explanation:

The initial population of the rabbit is 5.

After two months the population of the rabbit is 10.

After four months the population of the rabbit is 20.

After six months the population of the rabbit is 40.

After eight months the population of the rabbit is 80.

After ten months the population of the rabbit is 160.

After twelve months the population of the rabbit is 320.

The series can be formed as,

[tex]5,{\text{10, 20, 40, 80, 160, 320}}[/tex]

Now find the sum of all the population.

[tex]\begin{aligned}{\text{Sum}} &= 5 + 10 + 20 + 40 + 80 + 160 + 320\\&= 685 \\\end{aligned}[/tex]

The amount of rabbits after 1 year is [tex]\boxed{635}[/tex].

Learn more:

1. Learn more about inverse of the functionhttps://brainly.com/question/1632445.

2. Learn more about equation of circle brainly.com/question/1506955.

3. Learn more about range and domain of the function https://brainly.com/question/3412497

Answer details:

Grade: High School

Subject: Mathematics

Chapter: Geometric progression

Keywords: Rabbit, gardener, same ratio, amount of rabbits, growth, continues, 1 year, Five rabbits, after two months,

9,791 rounded to the nearest hundred

Answers

9,800 is your answer

9,791 rounded to the nearest hundred is 9,800 because the tens digit (9) is closer to 0 than 100.

Rounding 9,791 to the nearest hundred means finding the closest multiple of 100 to 9,791. To do this, we look at the tens digit, which is 9, and determine if it's closer to 0 or 100. Since 9 is closer to 0 than to 100, we keep the hundreds digit the same (9) and change all digits to the right to 0. So, rounding 9,791 to the nearest hundred gives us 9,800.

rule add 15, subtract 10 first term4

Answers

i think that would be 9 I am not sure.

first term is 4

4 + 15 = 19

19 - 10 = 9

9 is your answer

hope this helps

find and intrepret the Slope

Answers

little tip....when ur x values are exactly the same, u have a vertical line with a slope that is undefined

Two lines intersect to form a linear pair with equal measures. One angle has the measure 9x° and the other angle has the measure (9y − 54)°. Find the values of x and y.

Answers

My understanding is that the 2 angles add up to 180 degrees, so 9x+9y-54=180. Also, 9x=90 and 9y-54=90. 9x=90, so x=10. 9y=90+54. 9y=144. y=16. 


Find an equivalent fraction for the decimal number 0.66. In your final answer, include all of your work. 0.

Answers

it is zero because if you move the decimal over two times to the left

You use a microscope to look at bacteria that is 0.0034 millimeter long. The microscope magnifies the bacteria 430 times. How long does the bacteria appear to be when you look at it through the microscope?

Answers

ANSWER: 1.562
move the decimal point of 0.0034 to the right  to make it a whole number which is 34. Then multiply 34 times 430 which is 15,620.
move the decimal point  (which is at the end) 4 times to the left
the answer will be 1.562

Answer:

1.462 millimeters.

Step-by-step explanation:

You use a microscope to look at bacteria that is 0.0034 millimeter long.

The microscope magnifies the bacteria 430 times.

So the bacteria appears 430 times long through the microscope.

We will multiply the length of bacteria by 430.

The size of bacteria appear = 430 × 0.0034

                                              = 1.462 millimeters

The length of the bacteria would appear 1.462 millimeters through microscope.

0.42 inch of rain fell in 3 hours. How many inches of rain fell per hour?

Answers

divide total amount (0.42) by number of hours (3)

0.42 / 3 = 0.14 inches per hour

0.14 inched fell per hour

0.42/3= 0.14

Mal downloads 4 songs each week for 5 weeks.Then he sorts the songs into equal groups.There are 10 songs in each group.How many groups are there?

Answers

4(5)= 20

20/10= 2

There are 2 groups of songs.

Hope this helps!
There are 2 groups cause 4x5=20 then 20 divided by 2 is 10 so the answer is 2

What is the equivalent ratio of 5/9?

Answers

25/45 because you are multiplying the same amount to a number or a ratio

A used electronics store pays $40 for each cell phone, spends $25 refurbishing the phone, and sells the refurbished phone to a customer for $100.

Answers

if the question is how much do they make the answer would be they make 35 dollars because 25 + 40 =65 and 100-65=35

Answer:

h

Step-by-step explanation:

e

DO NOT COPY FROM ANOTHER ANSWER! I Will know!!
A stone was thrown into a pond from 8 feet above the surface of the water in the pond. Justin wrote +8 feet to represent the height from which the stone was thrown. What does 0 represent in this situation?

the depth of water in the pond
the level at which the stone fell
the surface of the water in the pond
the level from which the stone was thrown

Answers

It has to be the surface of the water, stone was 8ft above the surface.
depth is height of ground to surface.
level it fell was 8 ft
if level it was thrown was 0 then the surface would be -8ft
C is the right answer
I believe it would be "the surface of the water in the pond"  I hope that helps.

ab + 3c = 2x, for b

Answers

Ab + 3c = 2x

Subtract 3c from both sides.

ab = 2x - 3c

Divide a from both sides.

b = 2x - 3c / a

Hope this helps!
Final answer:

To solve the equation ab + 3c = 2x for b, subtract 3c from both sides and divide by a.

Explanation:

To solve the equation ab + 3c = 2x for b, we need to isolate b on one side of the equation. First, subtract 3c from both sides to get ab = 2x - 3c. Then, divide both sides by a to get the final solution: b = (2x - 3c) / a.

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In a Toy store, the ration of dolls to teddy bears is 9:3. If the store has 240 dolls, how many teddy bears are in the store

Answers

If the ratio is 9 to 3 and there are 240 dolls divide 240 by 3 which equals 80. I think that is how you do it.

Hope this helps

There are 80 teddy bear in the store.

What is mean by Ratio?

A ratio indicates how many times one number contain in another number. The ratio of two number is written as x : y, which is equivalent to x/y.

Where, x and y are individual amount of two quantities.

And, Total quantity gives after combine as x + y.

Given that;

The ratio of dolls to teddy bears is,

⇒ 9 : 3

Number of dolls in the store = 240

Now,

Since, The ratio of dolls to teddy bears is,

⇒ 9 : 3

⇒ 3 : 1

So, Number of dolls = 3x

And, Number of teddy bears = x

We can formulate;

⇒ 3x = 240

Solve for x as;

⇒ x = 240 / 3

⇒ x = 80

Thus, Number of teddy bears = x

                                             = 80

So, There are 80 teddy bear in the store.

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Simplify by collecting like terms: 2x-4-6x+8

Answers

(2x - 6x) + (-4 + 8)
-4x + 4

The expression 2x - 4 - 6x + 8 is simplified as 4(1 - x).

What is Algebra?

The analysis of mathematical representations is algebra, and the handling of those symbols is logic.

Making anything easier to accomplish or comprehend, as well as making it less difficult, is the definition of simplification.

PEMDAS rule means for the Parenthesis, Exponent, Multiplication, Division, Addition, and Subtraction. This rule is used to solve the equation in a proper and correct manner.

The expression is given below.

⇒ 2x - 4 - 6x + 8

Simplify the expression, then the value of the expression will be

⇒ 2x - 4 - 6x + 8

⇒ - 4x + 4

⇒ 4(1 - x)

The expression 2x - 4 - 6x + 8 is simplified as 4(1 - x).

More about the Algebra link is given below.

https://brainly.com/question/953809

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Quincy needs 322 yards of ribbon to decorate quilts for a craft fair. The ribbon comes in rolls of 15 yards. How many rules of ribbon should Quincy buy? Alice needs twice as many yards of ribbon as Quincy. How many rules of ribbon does Alice need?

Answers

I think it is 4380 but im not really sur

math question down below

Answers

it is the last one because -14 and -5 are 9 away.

Fractions and decimals are all around us. For example, you might have seen those oval stickers on the back of people’s cars that say 26.2. That is the length of a modern marathon, 26.2 mi. As a fraction, that would be 2 26 10 mi or, in simplest form, 1 26 5 mi. A. Find three examples of fr actions or decimals in the real - world. You can use videos, magazines, newspapers, books, or the In ternet. Don't take more than two examples from the same source. Also, get a mix of fractions and decimals. Don't choose all fractions or all decimals. B. List your examples. Explain each example and list the source. C. Convert each example either from a fraction to a decimal or from a decimal to a fraction. Don’t forget to show your work and simplify.

Answers

Example 1: Quarter pounder (USA McDonalds)
Fraction form: 1/4   Decimal form: 0.25

Example 2: BOGO 1/2 off (Sale at shoe store, buy one get one half off)
Fraction form: 1/2   Decimal form: 0.50

Example 3: Gas prices  
$2.63 per gallon
Fraction form: 2   63/100   Decimal form: 2.63

Quadrilateral ABCD is the result of a reflection of quadrilateral EFGH over the line. Which line segment in the image corresponds to EH in the pre-image?

A.) AD

B.) AB

C.) BC

D.) CD

Answers

the correct answer is A.)AD

Answer: A) AD

Step-by-step explanation:

Given: Quadrilateral ABCD is the result of a reflection of quadrilateral EFGH over the line.

We know that after reflection each point on the pre-image has a corresponding point on its image that is equidistant from a given line of reflection.

Since, EH shows the first and the last character of the name .

Thus, the line segment in the image corresponds to EH in the pre-image is AD because A is the first and D is the last character of the pre-image.

what are the common factors of 16a and 20ab

Answers

1, 2, 4

Hope this helped! :)

-9u - 5 + 6u = 19

What is u?

Answers

First you want to combine -9u and 6u to get -3u -5 =19
Then you add 5 to both sides to get -3u =24
Finally you divide by -3 to get u=-8

9th grade Algebra 1 help! PLEASE HELP ME! EXPLAIN YOUR ANSWERS :)

Answers

My best bet would be d

19.25 tons=_______lbs. Show work

Answers

19.25 tons=38,500 pounds

1 Tons - Short =2,000 Pounds
Just multiply 2,000 and 19.25 and get 38,500.

Hoped I helped!

Joe works full time as a carpenter and brings home $3,000 per month. He owes a total of $1,500 in fixed expenses every month, which includes items such as rent and insurance. If Joe had $1,000 in variable expenses such as groceries and entertainment, what would be his ending balance?

Answers

His ending balance would be $500. If you subtract $3,000 from $1,000 you get $2,000..then when you subtract $2,000 from $1,500 you get $500!!

Answer:

The answer is $500.

Step-by-step explanation:

Joe works full time as a carpenter and brings home $3,000 per month.

He owes a total of $1,500 in fixed expenses every month.

Joe had $1,000 in variable expenses.

Total expenses are = [tex]1500+1000=2500[/tex] dollars

So, his ending balance will be = [tex]3000-2500=500[/tex] dollars

Therefore, the answer is $500.

How many 3/4-foot lengths of pipe can be cut from a 6 1/3-foot pipe?

Answers

Final answer:

To find how many 3/4-foot lengths of pipe can be cut from a 6 1/3-foot pipe, you need to divide the length of the pipe by the length of each piece. The answer is 8 4/27 lengths of pipe.

Explanation:

To find how many 3/4-foot lengths of pipe can be cut from a 6 1/3-foot pipe, we need to divide the length of the pipe by the length of each piece. To do this, we convert both the length of the pipe and the length of each piece to the same unit of measurement. Here's how:

Convert 6 1/3 feet to improper fraction: 6 1/3 = 19/3 feet.Convert 3/4 foot to improper fraction: 3/4 = 9/12 feet.Divide the length of the pipe by the length of each piece: 19/3 / 9/12 = (19/3) x (12/9) = 228/27 = 8 4/27.

Therefore, you can cut 8 4/27 lengths of pipe from a 6 1/3-foot pipe.

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Luis purchased 24 purple plants and 8 pink plants. He wants to plant them in equal groups in his garden. What the largest number of groups he can make?

Answers

The correct answer is 3. He can make 3 groups of 11
He can make four groups. Each group should have one pink, and three purple plants. 

24/8=3

Three groups. One pink in each, three purple in each.

Hope this helps :)

Which of these numbers is NOT rational? A.√3 B.0.25 C.1/5 D.√9

Answers

The answer is A.
1.7320508075688773

The correct option is "option A" , i.e., √3 .

In the question some options are given which consists of some numbers.

We have to find out which number is not a rational number.

What is the difference between rational and irrational numbers ?

Irrational numbers can not be represented in the form of rational numbers or in other words the irrational number cannot be expressed in the p/q form.

As per the definition , Let's check which one is not rational.

A) √3

    = 1.723

This can't be represented in p/q form . So , this is not rational number.

By checking all other options we get to know that these all are rational numbers as we can express them in p/q form.

Thus , the correct option is "option A" , i.e., √3 .

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