Answer:
C.
Step-by-step explanation:
<h3>
Answer: 6 different ways</h3>
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Explanation:
Let's name the friends A, B, C
If person A is first, then B or C could be second and third.
So we have ABC or ACB as two possible outcomes.
If B is first, then either A is second or C is second. Meaning we have BAC or BCA.
If C is first, then we have CAB or CBA
Overall here are the 6 different ways to have the runners finish
- ABC ... A is first
- ACB ... A is first
- BAC ... B is first
- BCA ... B is first
- CAB ... C is first
- CBA ... C is first
Note how for the first slot we have 3 ways to pick the winner. Then after that selection is made, we have 2 choices left, then 1 choice for third place. Therefore, 3*2*1 = 6 different outcomes are possible.
We can use the factorial operation on the calculator to do this with one button press, so we'd say 3! = 6. The exclamation mark means "multiply from 3 down to 1, counting down the whole time".
Another example of a factorial is:
5! = 5*4*3*2*1 = 120
Answer:
-21.6
Step-by-step explanation:
-5.4
x 4 4x 4=16 so you carry the one to 5x4= 20 + 1 that was carried
-------- keep it negative
-21.6
5=5 I think but I know that their are infinitely solutions
Answer:
y = x ±√(x²+1)
Step-by-step explanation:
Rewrite to standard quadratic form, then use the quadratic formula.
... y² -2xy -1 = 0
... a=1, b=-2x, c=-1, so the quadratic formula
... y = (-b ±√(b²-4ac))/(2a)
can be filled in as ...
... y = -(-2x) ±√((-2x)² -4(1)(-1)))/2(1))
... y = x ±√(x² +1)
For any given value of x, there are two possible values of y. This is <em>not</em> a function.
