We want to find the value that makes
To find it we must look at the standard normal table, using the complementary cumulative table we find that
Then, using the z-score we can find the minimum score needed, remember that
Where
σ = standard deviation
μ = mean
And in our example, x = minimum score needed, therefore
Rounding to the nearest integer the minimum score needed is 568, if you get 568 you are at the top 20.1%.
X = r - h/y ; Solve for h & r
Let's first solve for h :)
Add h/y to both sides.
h/y + x = r
So, r = h/y + x
Now, let's solve for h.
x = r-h/y
Subtract r from both sides.
-r + x = -h/y
Multiply both sides by y.
y(-r + x) = y(-h/y)
Simplify.
-ry + xy = -h
Divide both sides by -1.
ry - xy = h
So, h = ry - xy
~Hope I helped!~
Answer:
see explanation
Step-by-step explanation:
Given
3x³ - 9x ← factor out 3x from each term
= 3x(x² - 3) ← in factored form
The answer is 112.5 miles in 90 minutes
To create a table you can do
50:40
100:80
112.5:90
We can find the answers by multiplying the original ratio 50:40 by 2.25 we do this because 90 minutes is 2.25 times longer than 40 minutes.
S = 5.1
First distribute:
2.1s + 2.8 - 1.1s = 7.9
Then combine like terms:
s + 2.8 = 7.9
Subtract 2.8 from both sides:
s + 2.8 +(-2.8) = 7.9 +(-2.8)
And finally your answer:
s = 5.1