Answer:
im stuck on this to
Step-by-step explanation:
Answer:
The correct alternatives
This is a subtraction expression
The correct expression is n minus 31
To evaluate the expression, subtract 31 from 29.
Step-by-step explanation:
Rafael writes an expression to represent “a number, n, decreased by thirty-one.”
First you gotta know what means "decreased by thirty-one". It means that
there exist two numbers where the difference between them is 31.
The number
decreased by 31 can be writen as
![n-31](https://tex.z-dn.net/?f=n-31)
The expression is therefore
![n-x=31 \implies \boxed{x=n-31}, n, m \in \mathbb{R}](https://tex.z-dn.net/?f=n-x%3D31%20%5Cimplies%20%5Cboxed%7Bx%3Dn-31%7D%2C%20%20n%2C%20m%20%5Cin%20%5Cmathbb%7BR%7D)
Rafael evaluates the expression
for ![n=29](https://tex.z-dn.net/?f=n%3D29)
![n-31 = 29-31 = -2](https://tex.z-dn.net/?f=n-31%20%3D%2029-31%20%3D%20-2)
Answer:
64 different black jack hands
Step-by-step explanation:
there are 4 aces in a deck, and you can score a blackjack if any of these 4 aces is paired with any of the 16 different cards that are worth 10 points. Total number of different blackjack combinations = 4 aces x 16 different tens = 64.
Even though the number of possible blackjack hands might seem large, the possibilities of actually getting one are really low:
possibility of getting 1 ace = 4/52 = 1/13
possibility of getting 1 ten = 16/51
possibility of getting a blackjack = 16 / 663
if you start with the 10 first the odds are the same:
possibility of getting 1 ten = 16/52 = 4/13
possibility of getting 1 ace = 4/51
possibility of getting a blackjack = 16 / 663
Answer:
The answer is 4 liters.
Step-by-step explanation:
We want a final 25% solution, which means that the solvent should constitute 25 percent of all the liters of solution.
Let us call
the litres of 40% solution, so when they are added to the 12 litres of 20% solution, the total litres of the new solution are:
![x+12](https://tex.z-dn.net/?f=x%2B12)
of these liters, 25% must be the solvent:
![N=0.25(x+12)](https://tex.z-dn.net/?f=N%3D0.25%28x%2B12%29)
Now for the 40% solution, the liters of the solvent are
, and for the 20% liter solution, the liters of solve are
liters. Thus the total liters
of the solvent are
![N=0.4x+2.4](https://tex.z-dn.net/?f=N%3D0.4x%2B2.4)
Therefore
![N=0.4x+2.4=0.25(x+12)](https://tex.z-dn.net/?f=N%3D0.4x%2B2.4%3D0.25%28x%2B12%29)
![\therefore x=4\:litres](https://tex.z-dn.net/?f=%5Ctherefore%20x%3D4%5C%3Alitres)
Answer: I believe the answer to this question is: X= 1/5.