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Tema [17]
2 years ago
13

Question 3

Mathematics
2 answers:
IgorLugansk [536]2 years ago
7 0

Answer:

E. 62

Step-by-step explanation:

Answer:

blue = 32

red = 62

IrinaVladis [17]2 years ago
4 0

Answer:

  E.  62

Step-by-step explanation:

If we let r, g, b represent the numbers of red, green, and blue disks, respectively, we are given the following relations:

  r + g + b = 105 . . . . there are 105 disks, total

  r -g = 30 . . . . . . . . . there are 30 more reds than greens

  g -b = 21 . . . . . . . . . there are 21 more greens than blues

We can use the third equation to substitute for b in the first equation.

  b = g -21 . . . . . third equation solved for b

  r + g + (g -21) = 105 . . . . substituted into the first equation

  r +2g = 126 . . . . . . . . . . . add 21 and simplify

Now, we can use the second equation to substitute for g in the one we have just written.

  g = r -30 . . . . . . second equation solved for g

  r +2(r -30) = 126 . . . . . . substituted into our equation for r and g

  3r = 186 . . . . . . . . . . . . . simplify and add 60

  r = 62 . . . . . . . . . divide by 3

Senja has 62 red disks.

__

<em>Additional comment</em>

g = 62 -30 = 32

b = 32 -21 = 11

Senja has 11 blue and 32 green disks, as well.

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so
5x+6y=12 and
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sub back

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2 years ago
Evaluate the integral ∫2−1|x−1|dx
defon

I think you might be referring to the definite integral,

\displaystyle \int_{-1}^2|x-1|\,\mathrm dx

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|x| = \begin{cases}x&\text{if }x\ge0\\-x&\text{if }x

Then |x-1|=x-1 if x\ge1, and |x-1|=1-x is x. So spliting up the integral at <em>x</em> = 1, we have

\displaystyle \int_{-1}^2|x-1|\,\mathrm dx = \int_{-1}^1(1-x)\,\mathrm dx + \int_1^2(x-1)\,\mathrm dx

The rest is simple:

\displaystyle \int_{-1}^2|x-1|\,\mathrm dx = \left(x-\dfrac{x^2}2\right)\bigg|_{-1}^1 + \left(\dfrac{x^2}2-x\right)\bigg|_1^2 \\\\ = \left(\left(1-\frac12\right)-\left(-1-\frac12\right)\right) + \left(\left(2-2\right)-\left(\frac12-1\right)\right) \\\\ = \boxed{\frac52}

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fAnswer:

Step-by-step explanation:

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