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nordsb [41]
3 years ago
7

Simplify (-8.5) (-5) (-2).

Mathematics
1 answer:
Ber [7]3 years ago
8 0

Answer:

-85

Step-by-step explanation:

(-8.5)(-5)(-2)

=(-8.5)(10)

=-85

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A score that is three standard deviations above the mean would have a z score of
tia_tia [17]

The value of z-score for a score that is three standard deviations above the mean is 3.

In this question,

A z-score measures exactly how many standard deviations a data point is above or below the mean. It allows us to calculate the probability of a score occurring within our normal distribution and enables us to compare two scores that are from different normal distributions.

Let x be the score

let μ be the mean and

let σ be the standard deviations

Now, x =  μ + 3σ

The formula of z-score is

z_{score} = \frac{x-\mu}{\sigma}

⇒ z_{score} = \frac{\mu + 3\sigma -\mu}{\sigma}

⇒ z_{score} = \frac{ 3\sigma }{\sigma}

⇒ z_{score} = 3

Hence we can conclude that the value of z-score for a score that is three standard deviations above the mean is 3.

Learn more about z-score here

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6 0
2 years ago
Question 8<br> Calculate the difference (4x2 + x - 5) – (5x2 - 1).
Rufina [12.5K]

Answer:

x - 6

Step-by-step explanation:

(4x2 + x - 5) - (5x2 - 1)

According to the order of operations, parenthesis come first so we will solve what is in the parenthesis first.

Then we do the multiplication because it comes before addition and subtraction.

4x2 = 8

Now we have 8 + x - 5

Combine like terms and 8-5=3 so we have 3 + x

Now for the second one.

5x2=10

10-1=9

Subtracting this from the first expression we have:

3+x-9 =

x - 6

7 0
2 years ago
What’s the slope ? PLS NEED HELP!
yawa3891 [41]

Answer:

m = -1/2

Step-by-step explanation:

m = slope = rise/run

rise +1

run -2

rise/run = 1/-2

=

-1/2

7 0
3 years ago
The area of the isosceles triangle is 80 square centimeters. Use the equation 1/2(8h) =80 to find the height of the triangle.
Dmitry [639]

Answer:

20cm

Step-by-step explanation:

Given data

Area=  80cm^2

we know that the expression for the area of a triangle is

A= 1/2B*H

from the given expression 1/2(8h) =80 the base is 8cm

let us substitute to find the height h

1/2(8h) =80

4h=80

h= 80/4

h= 20cm

Hence the heigth h is 20cm

6 0
2 years ago
Solve the compound inequality.
kondaur [170]

Answer:

x can be any real number

Step-by-step explanation:

5x<=21+2x

Or

3(x+1)>=24

5x-2x<=21

Or

3x+3>=24

3x<=21, i.e x<=7

Or

3x>=21, i.e x>=7

Since we have OR, at least one of them must be true. So x can be any real number.

8 0
3 years ago
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