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scoray [572]
3 years ago
9

50 sin2 x = 50 + 25 cos x

Mathematics
2 answers:
densk [106]3 years ago
6 0

Answer:

Step-by-step explanation:

divide by 25

2sin²x=2+cos x

sin²x+cos²x=1

sin²x=1-cos²x

2(1-cos²x)=2+cos x

2-2  cos²x=2+cos x

2cos²x+cos x=0

cos x(2 cos x+1)=0

cos x=0,

x=(2n+1)π/2

where n is an integer.

or

2cos x+1=0

cos x=-1/2=-cos π/3=cos (π-π/3),cos(π+π/3)=cos (2nπ+2π/3),cos (2nπ+4π/3)

x=(3n+1)2π/3,(3n+2)2π/3

where n is an integer.

AleksandrR [38]3 years ago
5 0

Step-by-step explanation:

there my duuuuuuuuuuuuuuuude

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Solve the equation <br>8(4- x) = 7x + 2<br>x=​
Jet001 [13]

Answer: x=2

Step-by-step explanation:

Expand.

32−8x=7x+2

Add 8x to both sides.

32=7x+2+8x

Simplify  7x+2+8x7x+2+8x  to  15x+215x+2.

32=15x+2

Subtract 22 from both sides.

32−2=15x

Simplify  32−2  to  30.

30=15x

Divide both sides by 15.

30/15=x

Simplify 30/15 to 2

2=x

Switch sides.

x=2

7 0
4 years ago
What's the probability of pulling two red cards in a row from a deck of cards?​
monitta

Hey there! I'm happy to help!

Let's say that we don't have jokers. In that case, there are 52 cards, and half of them are red (so 26 are red). The probability of pulling a red card once is 1/2 since half the cards are red.

If we pick one out, there are only 51 total cards left and 25 red cards. So, the probability of picking one again would be 25/51.

We multiply the probabilities of these two events to find the probability of them both happening.

1/2×25/51=25/102

The probability of picking two red cards in a row is 25/102 or around 24.5%.

Have a wonderful day! :D

8 0
3 years ago
Write the equation of the line that passes through the points ( 1 , − 6 ) (1,−6) and ( 8 , 9 ) (8,9). Put your answer in fully r
mars1129 [50]

Answer:

10-15. 5-9. 34-56 78-3

4 0
3 years ago
Find angle A and angle E
riadik2000 [5.3K]

Answer:

m∠A = 50°

m∠E = 50°

Step-by-step explanation:

7x - 17 and 2x + 8 are same side exterior angles. They have a sum of 180°.

7x - 17 + 2x + 8 = 180

9x - 9 = 180

9x = 189

x = 21

∠A and 7x - 17 are supplementary. ∠E and 2x + 8 are vertical angles.

m∠A + 7x - 17 = 180

m∠A + 7(21) - 17 = 180

m∠A + 147 - 17 = 180

m∠A + 130 = 180

m∠A = 50

m∠E = 2x + 8

m∠E = 2(21) + 8

m∠E = 42 + 8

m∠E = 50

8 0
3 years ago
15. Higher Order Thinking Nancy made a
Andreas93 [3]

The length of the rectangle is 20 inches, and the width of the rectangle is 4 inches if the table runner has an area of 80 square inches. The length and width of the table runner are whole numbers. The length is 5 times greater than the width.

<h3>What is the area of the rectangle?</h3>

It is defined as the space occupied by the rectangle which is planner 2-dimensional geometry.

The formula for finding the area of a rectangle is given by:

Area of rectangle = length × width

The area of the table runner = 80 square inches

Let's assume the length of the rectangle is L and the width is W

Then L = 5×W ...(1)

L×W = 80 ...(2)

Put the value of L in the equation (2)

5W(W) = 80

5W² = 80

W² = 16

W = ±4

Width cannot be negative.

W = 4 inches putting this value in the equation (1)

L = 5(4) = 20 inches

Thus, the length of the rectangle is 20 inches, and the width of the rectangle is 4 inches if the table runner has an area of 80 square inches. The length and width of the table runner are whole numbers. The length is 5 times greater than the width.

Learn more about the area here:

brainly.com/question/14383947

#SPJ1

8 0
2 years ago
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