PLZ HELP ME!!!!!I DONT UNDERSTAND

Answer:

Option (2)

Step-by-step explanation:

Given trigonometric expression is,

[tex]\text{cos}(\frac{11\pi}{21})\text{cos}(\frac{\pi}{7})-\text{sin}(\frac{11\pi}{21})\text{sin}(\frac{\pi}{7})[/tex]

This expression is in the form of an identity,

cos(A + B) = cos(A)cos(B) - sin(A)sin(B)

By substituting the values of A = [tex]\frac{11\pi}{21}[/tex] and B = [tex]\frac{\pi}{7}[/tex] in the identity,

[tex]\text{cos}(\frac{11\pi}{21})\text{cos}(\frac{\pi}{7})-\text{sin}(\frac{11\pi}{21})\text{sin}(\frac{\pi}{7})[/tex] = cos[tex](\frac{11\pi}{21}+\frac{\pi}{7})[/tex]

                                                  = cos[tex](\frac{11\pi+3\pi}{21})[/tex]

                                                  = cos[tex](\frac{14\pi}{21})[/tex]

                                                  = cos[tex](\frac{2\pi}{3})[/tex]

                                                  = -[tex]\frac{1}{2}[/tex]

Therefore, Option (2) will be the answer.

Answer:

B. -1/2

Step-by-step explanation:

on edge

Answer:

40.

Step-by-step explanation:

Look on the graph under minutes and go to minute one and in one minute it can make forty. just go straight up to until you reach the line.

Can I have brainlliest? Hope it helps.

Answer:

30

Step-by-step explanation:

Answer:

m = 5

m = -3

m = 1/6

m = 2/7

m = -8/3

Answer: 9 sq. ft

The area of a square is:  A = a²

A = 3²

A = 9

Plz mark brainliest:)

Step-by-step explanation:

1. d=30

2. b=8

3. n=-7

5. v=17

6.x=-13

7. b=48

Answear:

G=T hope dissssssssss helps

Answer:

4.21 Ounces

Step-by-step explanation:

You first want to add 6.54 to 6.09 getting you an answer of 12.63 then you want to divide that by 3 which gets you an answer of: there are 4.21 ounces in each bowl.

Answer:

64

Step-by-step explanation:

Answer:

-64 would be the answer

Answer:

2, 3 , 5/6, b

Step-by-step explanation:

Answer:

5.50

Step-by-step explanation:

I am smart

No! Because a mathematical statement is actually a statement that is either true or false not a statement that shows two expressions are equal using an equal sign!

Answer:

fix the awser

Step-by-step explanation:

Answer:

Length = 11.2 ft

Step-by-step explanation:

Area of a square garden = 125 square feet

Formula to find

Area of a square = length^2

Substitute the value of the Area of the square garden

Area of a square = length^2

125 = length^2

Find the square root of both sides

√125 = √length^2

11.18 = length

Approximately

Length = 11.2 ft

Answer:

i agree

Step-by-step explanation:

Answer:

possibly " remainders "

Step-by-step explanation:

hope this helps <3

Answer: 8

Step-by-step explanation: i took the test

1.25 days would be taken for 3 men to complete the same job.

A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0.

Given that 12 men 5 days to complete a job

We have to find for how many days three men can complete the same job.

Let x be the time taken by 3 men to complete the job.

Formulate a proportional equation.

12/5=3/x

Apply cross multiplication

12x=15

Divide both sides by 12

x=15/12

both 15 and 12 are multiples of 3

x=5/4

x=1.25

Hence, 1.25 days would be taken for 3 men to complete the same job.

To learn more on Ratios click:

https://brainly.com/question/13419413

#SPJ2

Answer:

e

Step-by-step explanation:

Make sure all words are spelled correctly.

Try different keywords.

Try more general keywords.

Try fewer keywords

Answer:

6+5]4

Step-by-step explanation:

Answer:

3

Step-by-step explanation:

BC

AC

BA

Answer:

x=-3

Step-by-step explanation:

I hope this help.

2

1

3

5/8 = 0.625

1/3 = 0.3333...

17/24 = 0.70833333

Answer:

Step-by-step explanation:

6 significant digits

only the first zero is not counted.

Answer:

The total amount of tax paid for the land was $126

Step-by-step explanation:

Proportions

The land tax charged is 0.7 per each $100 of the land value. For easy calculations, we find the ratio or proportion to be applied to the value of the land as:

0.7 / 100 =0.007

This factor can be used to obtain the tax charged for a given value of the land.

The plot of land of the question is valued at $18,000.

The tax charged is, then:

0.007*18,000 = 126

The total amount of tax paid for the land was $126

Answer:

x = 47°

Step-by-step explanation:

This is an exterior angle property, one of the properties in a triangle. The exterior angle theorem states that if a triangle's side gets an extension, then the resultant exterior angle would be equal to the sum of the two opposite interior angles of the triangle.

Answer:

x=45.6

Step-by-step explanation:

(2x-2)+x+45=180

Combine like terms.

3x+43=180

Subtract 43 on both sides.

3x+43=180

   -43 -43

3x=137

Divide by 3 on both sides.

3x=137

/3   /3

x=45.6

(I'm not sure if it's right because it's a decimal, but...)hope this helps!!!!! Have an amazing day c:

Answer:

2

Step-by-step explanation:

The number is in the fifth row  and first column so 2

Answer:20.8 is the correct answer

Step-by-step explanation:asked Siri

Answer:

2

Step-by-step explanation:

took it on edg

rectangle area: length x width

multiply each x-axis with the y-axies then find the mean average

Answer:

length: 15 units

Step-by-step explanation: