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mezya [45]
2 years ago
11

Answer quickly please

Mathematics
1 answer:
adell [148]2 years ago
8 0

Answer:

A C E

Step-by-step explanation:

pls mark brainliest

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Can someone please solve <br><br> 2/7y + 5 = -9
drek231 [11]

Answer:

y = -49

Step-by-step explanation:

4 0
2 years ago
4x+12=−2x<br><br> i need help my stoopid math teacher is mean...
ehidna [41]

Answer:

-2=x

Step-by-step explanation:

4x+12=-2x

Subtract 4x on both sides

12=-6x

Divided by -6 on both sides

-2=x

3 0
3 years ago
Questions 1&amp;2 I need help with who can help me
gayaneshka [121]
What do you need help with? it helps us to know the question!
7 0
3 years ago
Please help me understand
puteri [66]

9514 1404 393

Answer:

  D.  86°

Step-by-step explanation:

Points D and F divide the circle into two arcs. The long arc is labeled 274°, and the short arc is the one you're asked to find. You know the total of these two arcs is the full circle, 360°.

  274° + DF = 360°

  DF = 360° -274°

  DF = 86°

__

There are other relationships you can use to find arc DF. One of the simpler ones is ...

  DF and the external angle at E are supplementary:

  DF = 180° -94° = 86°

5 0
3 years ago
Which answer is the approximate standard deviation of the data set?
Anna35 [415]

Answer:

3.4

Step-by-step explanation:

Standard deviation of a population is defined as:

σ² = ∑(xᵢ − μ)² / n

The standard deviation of a sample is defined as:

s² = ∑(xᵢ − x)² / (n - 1)

It's not clear which one we have, so let's calculate both.

First, we must find the mean.

μ = (5+12+15+10+12+6+8+8) / 8

μ = 9.5

Now we find the squares of the differences:

(5-9.5)² + (12-9.5)² + (15-9.5)² + (10-9.5)² + (12-9.5)² + (6-9.5)² + (8-9.5)² + (8-9.5)²

= 80

Divide by n:

σ² = 80 / 8

σ² = 10

And take the square root:

σ = √10

σ ≈ 3.2

That's not one of the answers, so let's try the standard deviation of a sample instead of a population.

Instead of dividing by n, we'll divide by n-1:

s² = 80 / 7

And take the square root:

s = √(80/7)

s ≈ 3.4

So that must be it.

6 0
3 years ago
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