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Artemon [7]
3 years ago
13

1. Put 9y=-3x-39 into standard form

Mathematics
2 answers:
Kruka [31]3 years ago
5 0
1. 9y = -3x - 39....add 3x to both sides
    3x + 9y = -39 <== standard form

2. -2x + 2y = -2. ..multiply by -1
     2x - 2y = 2 <== standard form

3. -2x = 20
     x = -20/2
     x = -10....now sub this back into the second equation

     3x - 4y = -2
    3(-10) - 4y = -2
    -30 - 4y = -2
     -4y = -2 + 30
     -4y = 28
      y = -28/4
      y = -7

solution is (-10,-7) <== solution
Montano1993 [528]3 years ago
3 0
<span>1. Put 9y=-3x-39 into standard form 
           3x + 9y = -39 ...this is standard form

2. Put -2x+2y=-2 into standard form
           2x - 2y = 2 </span> ...this is standard form
<span>
3. Solve the system by either using substitution or elimination
{-2x=20, 3x-4y=-2}

-2x = 20
   x = -10

substitute x = -10 into  </span>3x-4y=-2

3x-4y=-2
3(-10)-4y=-2
-30 - 4y = -2
4y = -28
  y = -7

answer
x = -10 and y = -7
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cricket20 [7]
A lot of work but you're lucky cuz I am bored.

Because we were not given any specific point to start off with. I choose (2,2), which is shown in red as 1. Note that 1 box = 1 unit.

We translate it 2 times.
a) (x+5)(y+3) = (2+5)(2+3) = (7,5) is our new point (shown in brown as 2)
     Translation process shown in yellow.

b) (x-4)(y+2) = (7-4)(5+2) = (3,7) is our final point (shown in orange as 3)
    Note that we use the 2nd point for the second translation as required.
    Translation process shown in lime.

We can therefore determine from the picture below that you can use the translation (x+1)(y+5), which the translation process is shown in blue.
Proof: (x+1)(y+5) = (2+1)(2+5) = (3,7)

Now let's do it again, except we do the second translation first and the first translation last.

c) (x-4)(y+2) = (2-4)(2+2) = (-2,4) is our new point (shown in purple as 4)
    Translation process shown in pink.

d) (x+5)(y+3) = (-2+5)(4+3) = (3,7) is our final point (shown in orange as 3)
    Translation process shown in dark blue.
    Same rules as (b). Notice how the final point is still the same? Therefore it     makes no difference.

Hope I helped a lot :P

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responder: que?

paso a paso explica: ?

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Step-by-step explanation:

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Marianna [84]

Answer:

11.44% probability that exactly 12 members of the sample received a pneumococcal vaccination.

Step-by-step explanation:

For each adult, there are only two possible outcomes. Either they received a pneumococcal vaccination, or they did not. The probability of an adult receiving a pneumococcal vaccination is independent of other adults. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

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This means that p = 0.7

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This means that n = 20

Determine the probability that exactly 12 members of the sample received a pneumococcal vaccination.

This is P(X = 12).

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

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Answer:

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Step-by-step explanation:

Call that number “x”

The square of that number is x^2

Also as the cube is x^3

The ratio between these 2 values is 1:3, this means x^2 / x^3 = 1 / 3

<==> 1 / x = 1 / 3 (eliminate “x^2” for numerator and denominator of the fraction x^2 / x^3 )

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So, that number is 3 ! This math problem seems simple ;)

4 0
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