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Anon25 [30]
3 years ago
7

Help plssssss1. (x +3) 22. 6÷2(1+2)3. 15-1(12÷4+1)​

Mathematics
1 answer:
Lisa [10]3 years ago
5 0
1. 2x+7
2. 9
3.11
I help u there aowonxpwkdowiwvbwicbwocbiwcb
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A^2-12a+36<br><br> Factor. Check by expanding.
Jlenok [28]

     <span>a2 + 6a</span> + 6a + 36


                    a • (a+6)
              
                    6 • (a+6)

                    (a+6)  •  (a+6)
      

   Multiply  (a+6)  by  (a+6) 

The rule says : To multiply exponential expressions which have the same base,<span> add up their exponents.</span>


The product is therefore, <span> (a+6)<span>(1+1)</span> = (a+6)2</span> 

Final result :<span> -1 • (a + 6)<span>2</span></span>
3 0
3 years ago
Solve 2 sin 20 - tan 20 = 0 for 0 in [0°, 360°). <br><br> Any help would be really appreciated!
andre [41]

Answer:

Step-by-step explanation:

If there is a character you cannot type, such as θ, you are better off substituting a different letter, or describing it in words. For example, write it as "sinA" or "sin(theta)"

Never use 0 as a substitute for θ! 0 is a constant with a specific value.

Since the argument of the trig functions is an expression, you should put parentheses around it:  sin(2A).

:::::

I used several trigonometric identities for this question:

Double-angle formula for sine: sin(2θ) = 2sinθcosθ

Double-angle formula for tangent: tan(2θ) = 2tanθ/(1-tan²θ)

Quotient identity: tanθ = sinθ/cosθ 

Reciprocal identity: secθ = 1/cosθ

Pythagorean identity: 1+tan²θ = sec²θ

2sin(2θ) - tan(2θ) = 0

2sin(2θ) = tan(2θ)

2·2sinθcosθ = 2tanθ/(1-tan²θ)

2sinθcosθ = tanθ/(1-tan²θ)

2sinθcosθ = (sinθ/cosθ ) · 1/(cosθ(1-tan²θ))

2(1-tan²θ) = 1/cos²θ

2(1-tan²θ) = sec²θ

2-2tan²θ) = 1+tan²θ

1 = 3tan²θ

tan²θ = ⅓

tanθ = ±1/√3

θ = 30°, 330°

3 0
3 years ago
A jury pool has 17 men and 18 women, from which 12 jurors will be selected. Assuming that each person is equally likely to be ch
Svetach [21]

Answer:

0.86

Step-by-step explanation:

To find this, we need to know the number of ways the jury can be picked overall, and then the number of ways 8 men and 4 women can be on the jury. The fraction of the two will be the probability.

The total number of ways the jury can be picked is the combination of a pool of 35 people and choosing 12 is; C(30,12) = 30!/((12!)(30 - 12)!)

= 86,493,225

We have gotten the number of ways the jury can be picked.

Now let's find how many ways can the jury consist of 8 men and 4 women.

For the men, there are 17 in the pool and we're picking 8:

Thus, C(17,8) = 17!/((8!)(17 - 8)!) = 24,310

For the men, there are 18 in the pool and we're picking 4:

Thus, C(18,4) = 18!/((4!)(18 - 4)!) = 3,060

Thus, number of men and women choices = 24,310 x 3060 = 74388600

So; probability = 74388600/86,493, 225 = 0.86

6 0
4 years ago
Read 2 more answers
X squared plus 4 divided by x plus 9
aleksandr82 [10.1K]
X^2 + 4 
----------   + 9
     x
8 0
3 years ago
A person playing a game of chance has a 0.20 probability of winning. If that person plays the game 20 times and wins half of tha
o-na [289]

Answer:

Step-by-step explanation:

The theoretical result is 0.2 * 20 = 4

The experimental result is 1/2 * 20 = 10

The difference is 10 - 4 = 6

The probability difference = 6/20 = 0.3

8 0
3 years ago
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