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nadezda [96]
3 years ago
10

Given y=2x^2-6x+3. X=-1

Mathematics
1 answer:
konstantin123 [22]3 years ago
5 0
Y=2(-1)^2-6(-1)+3
y=2+6+3
y=8+3
y=11
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What's 5 + (7 x 8) divided by 3
Ganezh [65]

Answer:

23.6666666667

Step-by-step explanation:

6 0
3 years ago
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Solve for y -5y+8=-3y+10 what is the answer
masha68 [24]
-5y + 8 = -3y + 10
We need to get y on one side.
Add 3y to both sides.
-2y + 8 = 10
We need to get 2y by itself.
Subtract 8 from both sides.
-2y = 2
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y = -1

I hope this helps!
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8x to the 2nd power +2x-3=0
Papessa [141]

Answer:

x= 1/2 and -3/4

Step-by-step explanation:

By using factorization, we can solve this equation.

8x^2+2x-3=0

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(2x-1)(4x+3)=0

Solve:

2x-1=0

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x=1/2

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4x+3=0

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Hope this helped

5 0
3 years ago
The sum of mZAOB and mZBOC IS 128º. Find the measure of ZBOC.
amm1812
128 - 33 = 95
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4 0
3 years ago
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If you want to be 95​% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard
Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

What sample size is​ required?

A samle size of at least n is required, in which n is found when M = 3, \sigma = 20

So

M = z*\frac{\sigma}{\sqrt{n}}

3 = 1.96*\frac{20}{\sqrt{n}}

3\sqrt{n} = 20*1.96

\sqrt{n} = \frac{20*1.96}{3}

(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}

n = 170.7

Rouding up

The sample size required is at least 171

5 0
3 years ago
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