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miv72 [106K]
3 years ago
13

What value of x will satisfy the equation:cos( x) = sin( 2x+ 57 )

Mathematics
1 answer:
netineya [11]3 years ago
7 0

Step-by-step explanation:

cos \: x = sin \: (2x + 57) \\  \\  \therefore \: sin(90 \degree -  \: x) = sin \: (2x + 57) \\  \\ \therefore \:90  -  \: x = 2x + 57 \\  \\ 90   + 57  \:  = 2x + 3 \\  \\ \therefore \:3x = 147  \\  \\ \therefore  \: x =  \frac{147}{3}  \\  \\  \huge \orange{ \boxed{\therefore  \: x = 49 \degree}}

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Help Please !!!! Very Confused, do not understand how to complete these 2 questions properly.
Varvara68 [4.7K]

Answer:

11) tan(7x+3) = OE/OJ

7x+3=arctan(OE/OJ)=45

x=6


12) a) x = 40

<ajq = <acq (base angles of isosceles triangle)

50+x+90=180

x=40


b) they are congruent triangle, reason HL   (hypotenuse, leg)

aj=ac

aq=qa

right angle equal

8 0
3 years ago
Five cards are drawn from a standard 52-card playing deck. A gambler has been dealt five cards—two aces, one king, one 3, and on
Nookie1986 [14]

Answer:

The probability that he ends up with a full house is 0.0083.

Step-by-step explanation:

We are given that a gambler has been dealt five cards—two aces, one king, one 3, and one 6. He discards the 3 and the 6 and is dealt two more cards.

We have to find the probability that he ends up with a full house (3 cards of one kind, 2 cards of another kind).

We know that gambler will end up with a full house in two different ways (knowing that he has given two more cards);

  • If he is given with two kings.
  • If he is given one king and one ace.

Only in these two situations, he will end up with a full house.

Now, there are three kings and two aces left which means at the time of drawing cards from the deck, the available cards will be 47.

So, the ways in which we can draw two kings from available three kings is given by =  \frac{^{3}C_2 }{^{47}C_2}   {∵ one king is already there}

              =  \frac{3!}{2! \times 1!}\times \frac{2! \times 45!}{47!}           {∵ ^{n}C_r = \frac{n!}{r! \times (n-r)!} }

              =  \frac{3}{1081}  =  0.0028

Similarly, the ways in which one king and one ace can be drawn from available 3 kings and 2 aces is given by =  \frac{^{3}C_1 \times ^{2}C_1 }{^{47}C_2}

                                                                   =  \frac{3!}{1! \times 2!}\times \frac{2!}{1! \times 1!} \times \frac{2! \times 45!}{47!}

                                                                   =  \frac{6}{1081}  =  0.0055

Now, probability that he ends up with a full house = \frac{3}{1081} + \frac{6}{1081}

                                                                                    =  \frac{9}{1081} = <u>0.0083</u>.

3 0
3 years ago
Read 2 more answers
-8x-2y=-22<br> 16x+7y=17
Nataly [62]
2(-8x-2y=-22)
16x+7y=17

-16x-4y=-44
16x+7y=17

3y=-27
y=-9

16x+7(-9)=17
16x+-63=17
16x=80
X=5
5 0
3 years ago
Please help 7th grade math question? URGENT! awarding brainliest!
Ivenika [448]

correct Option is B i.e, 72x^2+288x^2-216x whose simplified form is: 360x^2-216x

Step-by-step explanation:

We need to solve the expression:

2[(6x)(6x)]+4[(12x - 9)(6x)]

Solving:

2[(6x)(6x)]+4[(12x - 9)(6x)]\\=2[36x^2]+4[(12x*6x)-(9*6x)]\\=72x^2+4[72x^2-54x]\\=72x^2+288x^2-216x\\=360x^2-216x

So, correct Option is B i.e, 72x^2+288x^2-216x whose simplified form is: 360x^2-216x

Keywords: Surface area of the rectangular prism

Learn more about surface area of the rectangular prism at:

  • brainly.com/question/12613605
  • brainly.com/question/6443737
  • brainly.com/question/3306327

#learnwithBrainly

4 0
3 years ago
How much does the angels add up to in a rectangle
monitta
One of the requirements of a rectangle is that it must have four right angles ( a right angle is 90 degrees) so you just multiply 90 by 4 and you get 360 degrees
6 0
3 years ago
Read 2 more answers
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