4cos^2(x)-7cos(x)+3
Please help and explain how you did it :)

Answers

Answer 1

I assume you're asked to solve

4 cos²(x) - 7 cos(x) + 3 = 0

Factor the left side:

(4 cos(x) - 3) (cos(x) - 1) = 0

Then either

4 cos(x) - 3 = 0   or   cos(x) - 1 = 0

cos(x) = 3/4   or   cos(x) = 1

From the first case, we get

x = cos⁻¹(3/4) + 2  or   x = -cos⁻¹(3/4) + 2

and from the second,

x =

where n is any integer.


Related Questions

hiking at a constant rate, fred covers 6miles in 4 hours. Predict how far he can hike in 10hours.

Answers

Answer:

15 miles

Step-by-step explanation:

First you divide 6 by 4 then multiply the result by 10

15 miles is what he walked in 10 hours

2 를
of
2
Angie is saving money for a new bike. She has
3
the amount of money she needs for the bike.
She has $120 saved. How much does the bike cost?
If she saves $10 a week, how many more weeks will it
take for her to be able to buy the bike?

Answers

Answer:

she has $40

Step-by-step explanation:

Find the slope of (4,4) (-6-4) plz need this like in 20 minutes

Answers

Answer:

The slope is 0

Step-by-step explanation:

Can someone tell me how does this make sense?- or am I being stupid?

Answers

Answer:

It looks like she/he didn't count the question and just gave extra points. This made me lose some brain cells

Step-by-step explanation:

please help me with the question

Answers

Answer:

D. If you go through all the equations they all come out true beside this one. With this one Alisha pays $1,480 which is less than $1,500

A telephone marketer earns a 14% commission on their sales each week. In one week, their sales amounted to $920.
1a
First, find 10% of their total sales.

Answers

Answer:

I love u plz don't report

Keyla traveled 2155 kilometers by car to visit some relatives. If 1 km is approximately 0.62 miles, then what is the number of miles Keyla traveled to the nearest unit? 1,336 miles 7,471 miles 2,877 miles 3,470 miles

Answers

Answer:

1336miles.

Step-by-step explanation:

From the question we are told that;

1km represents 0.62miles

1km = 0.62miles

We are to express 2155kilometers in miles.

2155km = x miles

Find x:

Divide both equations;

1/2155 = 0.62/x

Cross multiply;

1 * x = 2155 * 0.62

x = 1,336.1miles

Hence the correct option is 1336miles.

A rectangle has a length of x inches and a width 2 inches less than the length. If the dimensions were doubled, what would be the area, in square inches , of the new rectangle in terms of x

Answers

Answer:

Option (4)

Step-by-step explanation:

Area of a rectangle = Length × width

If the dimensions of the given rectangle is doubled,

Area of the new rectangle = 2(Length) × 2(width)

                                            = 4(Length × width)

                                            = 4(x)(x - 2)

                                            = 4[x² - 2x]

                                            = 4x² - 8x

Therefore, Option (4) will be the correct option.

Rewrite the equation C = 2nr to show the expression that can be used to find the value of r.

Answers

The process is:

C = 2nr

2nr = c

r (2n) = c

[tex]r = \frac{c}{2n} [/tex]

That's the answer☝️☝️☝️☝️

or maybe this one

r = 2n + c

sorry, I'm unsure, it has been too long since I studied that...

Answer:

C = 2nr

you divide by 2n both sides

that means C/2n = 2nr/2n

after that you simplify then it will be C/2n = r

r = C/2n

Help me out guys I’ll give u a star

Answers

The answer would be 9 :)!

Which situation is modeled by the equation 24 = 15x + 8 ? Which one of these are the correct answer that goes with this equation

Answers

Answer:The bottom answer

Step-by-step explanation:

Answer:

1.0666666667

Step-by-step explanation:

first do -8 under +8, cross it out then do -8 under 24 or 24 - 8 = 16 then do 16÷15x

A grocery store sells a bag of 3 oranges for $1.71. How much does one orange cost?

Answers

Answer: 57 cents each

Answer:

57 cents

Step-by-step explanation:

divide the amount of money by the amount of oranges to find the amount each of them are. so if each of them are 57 then 1 is 57.

I need help with this plz percent equations 100% of blank = 600,000

Answers

Answer:

100% of 600,000 = 600,000

Step-by-step explanation:

The answer will be 600,000

Since

100% of 6,000,000 = 6,000,000 so,

100% of 600,000 = 600,000

600,000, since 100% of something is the number itself.

I really need help ​

Answers

Answer:

There is a positive correlation in the data set.

General Formulas and Concepts:

Statistics - Scatterplots

Positive Correlation - an upwards trend in the data setNegative Correlation - a downwards trend in the data setNo Correlation - an undeterminable correlation in the data set

Step-by-step explanation:

According the data set on the graph, we can see that if we draw a line of best fit, the overall data would be increasing. Therefore, we would have a positive correlation.

State the operations used to solve the following equation 2x+8=9

Answers

Answer:

Subtraction and Division

Step-by-step explanation:

2x+8=9

2x+8-8=9-8

2x=1

x=1/2

In 1940 you could buy a soda for 5 cents. Today the average cost of the same size soda is $1.25. What is the percent of increase in the cost of a soda?

Answers

Answer:

2400%

Step-by-step explanation:

Answer: 2,400%

Step-by-step explanation:

1.25 * 100/0.05 = 2,500

2,500% - 100% = 2,400%

Solve the system of equations by graphing. y= -2x + 1

Answers

Answer:

y= -2x + 1

Step-by-step explanation:

answer quickly please doing test !!!!!

Answers

Answer:

[tex]2w - \frac{ 7}{4} [/tex]

Step-by-step explanation:

[tex] \frac{1}{4} \times 8w = 2w \\ \frac{1}{4} \times ( - 7) = \frac{ - 7}{4} [/tex]

Answer: 2w -7/4

Step-by-step explanation:

    1 /4(8w  − 7)  

Apply the distributive property.

    1 /4(8w  − 7)  + 1/4  ⋅  − 7

Cancel the common factor of 4.

Factor 4 out of 8w.

     2w + 1/4 ⋅ -7

Combine  1/4 and -7

    2w + ((-7)/4)

Move the negative in front of the fraction.

    2w − 7/4

The number of dimes in the bag can be represented by x. The number of quarters is 6 more than twice the number of dimes. There are a total of 276 coins in the bag. What is x, the number of dimes in the bag?

Answers

Answer:

The number of dimes  is represented by x = 90

Step-by-step explanation:

Given that:

The number of dimes  is represented by x

Number of quarters = 6  + 2x

Total number of coins in the bag = 276

To find x, we have:

x + 6 + 2x = 276

3x + 6 = 276

3x = 276 - 6

3x = 270

x = 270/3

x = 90

Plz, Help me with this question.

Answers

Answer:

12x + 16y

Step-by-step explanation:

Multiply 4 and 3x to get 12x.

Multiply 4 and 4y to get 16y.

The sign stays positive because 4 is positive, so we end up with 12x + 16y.

bag of sweets £1.50 per bag, buy 3 get 1 free how many sweets can you buy for £9

Answers

Answer: 8

if you're talking about how many bags of sweets you can BUY, as in without counting the ones you got for free, it's 6. if you're talking how much you GOT, it's 8.

Step-by-step explanation:  you can multiply 1.5 times an unknown number to get nine. the unknown number would be the number of bag of sweets you get without the "buy 3 get 1 free" thing. You can reverse the equation to get 9 divided by 1.5 equals 6.

you can then divide 6 by three, which is 2- meaning you got two free bags of sweets. 6 plus 2 is 8.

Answer:

8 I believe

Step-by-step explanation:

1.50 x 3 = 4.50 so for 4 bags you need 4.50

1.50 x 6 = 9 but you can't forget about the buy 3 get 1 deal

you bought 6 which is two times 3 so would get two free

6+2= 8

I apologize if I didn't explain it enough or got it wrong

wHaT is 3+3x+45??????????

Answers

Answer:

3x+48

add 3+45=48

Step-by-step explanation:

Hope this helps! Please consider marking brainliest! I hope you have an amazing day. Always remember, your smart and you got this! -Alycia :)

Answer:

3(x+16)

Step-by-step explanation:

45+3=48

3x/3=x

48/3=16

3(x+16)

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

To graduate you must take at least 12 core credits and 6 electives credits and you can take no more than a total of 26 credits. Write a system of inequalities that defines how many of each you can take.

C≥12,E≥6,C+E≤26

C+E≥18,C+E≤26

C+E≥18,C+E<26

C≤12,E≤6,C+E≤26

Answers

Answer:

C≥12,E≥6,C+E≤26

Step-by-step explanation:

i just took the quiz and got it right

The system of inequalities will be C≥12, E≥6, and C+E≤26. Then the correct option is A.

What is inequality?

Inequality is the relationship between two expressions that are not equal, employing a sign such as ≠ “not equal to,” > “greater than,” or < “less than.”.

The Inequality to graduate you must take at least 12 core credits,

C≥12

The Inequality to graduate you must take at least 6 electives credits,

E≥6

No more than a total of 26 credits for both core and electives.

C+E≤26

Hence, the correct option is A.

To know more about inequality follow

https://brainly.com/question/24372553

#SPJ2

What is m∠J? a 59 , b 61, c 60

Answers

Answer:

I need

Step-by-step explanation:

This

Answer:

B. 61

Step-by-step explanation:

London bought snacks for her team's practice. She bought a bag of apples for $2.25 and a 18-pack of juice bottles. The total cost before tax was $9.63. Write and solve an equation which can be used to determine
j
j, how much each bottle of juice costs?

Answers

Answer:

go to siri

Step-by-step explanation:

go to your phone

go to siri

and ask

for f(x)=-3x+2 find each value

f(-4)=

f(5)+8=

f(3)-f(6)=

Answers

Step-by-step explanation:

1. f(-4)=-3x+2

x=-4

f(-4)=-3(-4)+2

f-4=-3-4+2

f-4=-5

f-4/-4=-5/-4

f=5/4

To add or subtract numbers with the power of ten you need to make sure the exponents match before you do anything to the coefficients

Answers

Answer:

is this a true or false question? If so, it's false. To add or subtract, the bases have to match, not the exponents.

Step-by-step explanation:

Answer:

nope it doesn't matter the exponents they don't have to match but you later have to add them and add that many zeros back as the exponents

y = -2x+3 write in standard form

Answers

Answer:

y + 2x - 3 = 0

Step-by-step explanation:

You should learn the topic.

Answer:

2x+y-3=0

Step-by-step explanation:

The standard form is a representation of equations that start from the variable term towards the constant term, generally leaving the RHS empty.

Here,

[tex]y=-2x+3\\y+2x=3\\y+2x-3=0\\2x+y-3=0[/tex]

PLEASE HELP ! Which inequality represents “nine more than three times a number is greater than 21”.
A. 9n > 21
B. 9+ 3 > 21
C. 3n +9 > 21
D. 9n + 3 > 21

Answers

Answer:

C

Step-by-step explanation:

Answer:

C. 3n+9>21

Step-by-step explanation:

Ignore the 9 for a second and think about the phrase "3 times a number", if we say n is the number, then 3n is 3 times the number n.

Now we need something that is 9 more than this 3n, that means you add 9 to this, so you have 3n+9.

Finally, this 3n+9 is greater than 21, so we have 3n+9>21.

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