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Kruka [31]
3 years ago
15

Find the exact value of the given expression using a sum or difference formula.

Mathematics
1 answer:
leonid [27]3 years ago
5 0
<span>sin (a - b) = sinacosb - sinbcosa
1) sin345° = sin (360 - 15) = sin360cos15 - sin15cos360= 0-sin15 *1=
  </span>sin345° = - sin15, 

2) cos(11π) /12= - cos pi / 12 = cos ( - 4pi/12  +3pi/12)= cos (- pi/3 + pi/4) =
cos (-pi/3) cos pi/4) + sin (-pi/3) sin( pi/4) = sqrt6 /4 - sqrt2/ 4

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Help me please , thank you so much
Llana [10]

Answer:

B.......

Step-by-step explanation:

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3 0
3 years ago
Factor the following expression completely 15x - 6
elena-s [515]
15x-6
=3*(5x-2)

The final answer is 3*(5x-2).

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6 0
3 years ago
Read 2 more answers
Find the values of x and y in the following equation
Lostsunrise [7]

Answer:

B. x = 5 and y = -13

Step-by-step explanation:

Equating real parts, we have ...

... x + 4 = 9

... x = 9 - 4 . . . . subtract 4

... x = 5

___

Equating imaginary parts, we have ...

... yi +9i = -4i

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4 0
3 years ago
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Multi step equation and check 12x+3-1=35
ch4aika [34]

Answer:

11/4

Step-by-step explanation:

<em><u>Step 1: Simplify both sides of the equation.</u></em>

12x+3−1=35

12x+3+−1=35

(12x)+(3+−1)=35(Combine Like Terms)

12x+2=35

12x+2=35

<em><u>Step 2: Subtract 2 from both sides.</u></em>

12x+2−2=35−2

12x=33

<em><u>Step 3: Divide both sides by 12.</u></em>

12x / 12 = 33 / 12x =

11 / 4

5 0
3 years ago
Simple interest $34,000 invested at 4% for 3 years
valentinak56 [21]

Answer:

final amount would be $38080

Step-by-step explanation:

1) find 4% of 34000

34000 x .04 = 1360

2) multiply that by your time frame which is 3 years

1360 x 3 = 4080

3) add your interest to your original amount

34000 + 4080 = 38080

5 0
4 years ago
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