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Ostrovityanka [42]
3 years ago
8

How do I solve these equations:

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
7 0

Answer:

Step-by-step explanation:

Given that

sin(2θ)+sinθ=0

We know that

sin(2θ)=2 sinθ x cosθ

Therefore

2 sinθ x cosθ + sinθ=0

sinθ(2 cosθ+1)=0

sinθ= 0

θ=0

2 cosθ+1=0

cosθ= - 1/2

θ=120°

_______________________________________________________

sin 2\theta=\sqrt{3cos\theta}

By squaring both sides

sin^2 2\theta={3cos\theta}

4 sin²θ x cos²θ=3 cosθ

4 sin²θ x cos²θ - 3 cosθ=0

cos θ = 0

θ= 90°

4 sin²θ=3

θ=60°

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What multiples for 90 and adds up to -23 ?
melamori03 [73]

Easy buddy...

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Step (1)

I choose a number which is x

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Step (2)

Multiplies by 90 :

90x

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Step (3)

Adds up to -23 :

90x - 23

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And we're done.

Thanks for watching buddy good luck.

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7 0
3 years ago
Pls help asap! i will mark brainliest!
IrinaK [193]

Answer:

AB would be 18 or the first choice.

Since BD is the median that means from A to D and from D to C are equal. We set this up as an equation and solve it.

<em>x + 8 = 2x - 17</em>

<em>   </em><em><u>+ 17       +17</u></em>

<em>x + 25 = 2x</em>

<em><u>-x            -x</u></em>

<em>     25 = x</em>

This gives us our first bit of the answer. Then we plug this into our equation for the length of AB to get 18.

Step-by-step explanation:

hope this helps. . . <3

good luck!      uωu

6 0
3 years ago
Please answer this correctly
Katarina [22]

Answer:

SA = 1,176 ft².

Step-by-step explanation:

To find the surface area of the triangular prism, we can solve for the rectangular base, both triangular faces, and lateral sides separately.

For the rectangular base: (Use formula l×w)

20 × 18 = 360 ft²

For the triangular faces: (Use formula 1/2(b·h)

1/2(18 × 12) = 108 ft²

Since there are two faces, we need to double the amount.

108 × 2 = 216 ft².

Finally, solve for the lateral sides:

20 × 15 = 300 ft².

There are two sides, so:

300 × 2 = 600 ft².

Add up all of these areas:

600 + 216 + 360 = 1,176 ft²

5 0
3 years ago
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8_murik_8 [283]

Answer:

Angle 10=74 deg

Alternate Interior angle theorem

Step-by-step explanation:

They are Alternate Interior angles.

5 0
2 years ago
The equation of a circle in general form is ​ x2+y2+18x−36y+369=0 ​
Rudiy27
(x+9)^2+(y-18)^2=36 is the equation in standard form. Hope this helps.~<span>Haяяison</span>
8 0
3 years ago
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