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strojnjashka [21]
3 years ago
14

Sean los ángulos a y B, donde la suma de la mitad de a mas la tercera parte de B es igual a 15. calcula el doble del cociente de

l seno de 3a y el coseno de 2B. Urgente pls a es alpha y B es beta por si acaso
Mathematics
1 answer:
Schach [20]3 years ago
6 0

Answer:

Supongo que tenemos dos ángulos A y B

"la mitad de A mas la tercera parte de B es igual a 15°" (también supongo que son grados)

A/2 + B/3 = 15°

A/2 = 15° - (B/3)

A = 30° - 2*(B/3)

Ahora queremos calcular:

2*sin(3*A)/cos(2*B)

pero podemos reemplazar A por lo que tenemos arriba:

2*sin(3*(30° - 2*(B/3)))/cos(2*B)

2*sin(90° - 2*B)/cos(2*B)

y como sabemos,  

Sin( 90° - x) = Sin(90°)*cos(-x) + cos(90°)*sin(-x) = cos(-x) = cos(x)

entonces:

2*sin(90° - 2*B)/cos(2*B) = 2*cos(2*B)/cos(2*B) = 2*1 = 2.

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Gre4nikov [31]

Answer:

45 mph the the middle one

Step-by-step explanation:

i did the same one and got 45 and its right

4 0
2 years ago
I NEED HELP PLEASE, THANKS! :) A commercial passenger jet is flying with an airspeed of 185 miles per hour on a heading of 036°.
Sindrei [870]

We are given that the passenger's jet is flying at a speed of 185 miles per hour, with a direction of 36 degrees, and the wind speed being 47 mph with a direction of 120 degrees. From this, you could create a diagram is shown in the attachment.

[ 185 cos 36, 185 sin 36 ]

+ [ 47 cos 120, 47 sin 120 ]

_______________________

[ 185 cos 36 + 47 cos 120, 185 sin 36 + 47 sin 120 ]

√( 4263  + 33988 )^2

= ( About ) √38251 = 195.57 mph

<u><em>Solution = 195.6 mph, 069° </em></u>

4 0
4 years ago
1. Mckayla is using elimination to solve the
Arturiano [62]
By using the elimination method, you would essentially add the two equations together by combining like terms. normally this would require manipulation however this equation doesn't because the y is already opposites of each other. (a negative and positive value of the same number i.e. -2 and 2)

so add the two equations together and you're left with 2x = 16, (they y's cancelled each other out) then divide two on both sides to get x = 8

now, use that x value in either equation (it doesn't matter which), we can use -3x+2y=-26

plug it in to get -3(8) + 2y = -26
which is then -24 + 2y = -26
add 24 to both sides: 2y = -2
divide 2 on both sides: y = -1

now knowing x=8 and y= -1 we can say that the answer is (8,-1)

hope this helps!!
6 0
3 years ago
Find the area of a circle with a circumference of 12.56 units
ElenaW [278]

Answer:

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Step-by-step explanation:

The formula for circumference is

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Our circumference is 12.56.  Using 3.14 for π, we have

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12.56 = 6.28r

Divide both sides by 6.28:

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2 = r

The area of a circle is given by the formula

A = πr²

Using 3.14 for π and our radius of 2, we have

A = 3.14(2²) = 3.14(4) = 12.56.

4 0
3 years ago
The Figure is a parallelogram. solve for x<br> a) x=1<br> b) x=11<br> c) x=7<br> d) x=7
Alja [10]

Step-by-step explanation:

Try B I'll cry if it's not B

6 0
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