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crimeas [40]
3 years ago
12

If 3x = y-5 and x = -4, then y=

Mathematics
2 answers:
sveta [45]3 years ago
6 0
3( -4 ) = y - 5
-12 = y - 5
y = -7
Mekhanik [1.2K]3 years ago
3 0

3x=y-5\ \ \ \ |+5\\3x+5=y\to y=3x+5\\\\\text{substitute the value of x to the expression}\\\\y=3(-4)+5=-12+5=-7

Answer: y = -7.

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BRAINLIEST if correct
Mekhanik [1.2K]
Okay so median is the number in the middle and mean is when you add them all up and divide by how many numbers there are 

<span>20,28,35,40,132 

So 35 is the median 
and the mean is </span>20 + 28 + 35 + 132 + 40 = 255 / 5 = 51

the mean is a better way to represent the data because it does not just pick a number from the set of numbers it calculates the average 
7 0
3 years ago
I need help I don’t understand...
pentagon [3]

Answer:

(1 , -2)

Step-by-step explanation:

The intersecting point of two lines is the solution

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3 years ago
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What is the least common multiple of 2,6 and 15?
Alex

Answer:

LCM of 6 and 15 by Listing Multiples

Step 2: The common multiples from the multiples of 6 and 15 are 30, 60, . . . Step 3: The smallest common multiple of 6 and 15 is 30.

4 0
3 years ago
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A²-a² what is the answer​
san4es73 [151]

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7 0
3 years ago
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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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