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mixer [17]
3 years ago
9

Find the area of each figure. Use 3.14

Mathematics
1 answer:
madreJ [45]3 years ago
7 0
I think its 18.24 because if you multiply it by 3.14 then subtract u should get 18.24
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Solve the equation cos (x/2) = cos x + 1. what are the solutions on the interval 0° ≤ x < 360°?
Sedbober [7]

Answer:

Step-by-step explanation:

cos (x/2)=cos x+1

cos (x/2)=2cos ²(x/2)

2 cos²(x/2)-cos (x/2)=0

cos (x/2)[2 cos (x/2)-1]=0

cos (x/2)=0=cos π/2,cos (3π/2)=cos (2nπ+π/2),cos(2nπ+3π/2)

x/2=2nπ+π/2,2nπ+3π/2

x=4nπ+π,4nπ+3π

n=0,1,2,...

x=π,3π

or x=180°,540°,...

180°∈[0,360]

so x=180°

or

2cos(x/2)-1=0

cos (x/2)=1/2=cos60,cos (360-60)=cos 60,cos 300=cos (360n+60),cos (360n+300)

x/2=360n+60,360n+300

x=720n+120,720n+300

n=0,1,2,...

x=120,300,840,1020,...

only 120° and 300° ∈[0,360°]

Hence x=120°,180°,300°

7 0
2 years ago
What is the value of the expression when c=-5 and d=2?
Andre45 [30]
The answer is D. -169
4 0
3 years ago
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Find the values of x, the lengths of AB and BC
yarga [219]

Answer: The picture is black lol

Step-by-step explanation:

7 0
3 years ago
Please help! Important
guapka [62]
Add the two angles and set them equal to 180, them solve for x
3 0
3 years ago
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Need help please guys.
KengaRu [80]

Answer: x= 21.6

Step-by-step explanation:

12^2  + 18^2  =x^2

144 + 324 =x^2

468  = x^2

c=  21.633  

To the nearest tenth place  is c= 21.6

3 0
3 years ago
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