That would be 20 x 19 x 18 which equals 6840.
After first place is chosen, 19 spots left and so on.
The answer is 6840 ways.
Answer:
Step-by-step explanation:
Pretend you see a right triangle here. From the lower end of the line go up 5 and you will be on the same horizontal as the upper end of the line. Go over 6 units and you close your triangle. This is a right triangle with legs 5 and 6 units long. We are looking for the hypotenuse of this triangle. Use Pythagorean's Theorem:

25 + 36 = ??² and
61 = ??² so
?? = √61

Expand


Rewrite as:

Apply law of indices


Expand



Apply negative power rule of indices

Expand



Expand

Evaluate like terms

Factor out x^2

Factor out -2


Divide by y

Split


Rationalize



Rationalize


Apply different of two squares to the denominator



Simplify


Expand

Split

Evaluate all roots




Expand

Factorize each

Factor out (r+3) in the numerator and (r + 6) in the denominator

Cancel out r - 2


Cancel out x

Expand the numerator of the 2nd fraction

Factorize

Factor out x - 7

Factor out 4 from 4x + 8

Cancel out x + 2



Factorize

Cancel out 3x


Take LCM

Expand



Rewrite as:

Express as multiplication

Express y^2 - 9 as y^2 - 3^2

Express as difference of two squares



Read more at:
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Answer:
54
Step-by-step explanation:
Substitute n into the equation:
-2(3)[5+3-8-3(3)]
-6[-9]
+54
Y = -3x + 10
im pretty sure it’s this one