Answer:
The probability is 
Step-by-step explanation:
The psychology class has 9 freshman male, 15 freshman females, 8 sophomore male and 12 sophomore female.
Total population constitution of the class=
17 males and 27 females and 44 students in total.
If on selecting on the first attempt, a male has been picked up then the number of males for the picking up in the second attempt has to decrease by one.
Also, the total number of students from which it has to be selected also decreases by 1, because one child has already been selected.
Therefore for Second Attempt, Total 43 students and 16 males.
Probability=
Probability=
Answer:
Step-by-step explanation:
Make denominators same:
Add the numerators:
Apply the rule:
Therefore,
Cancel out common factor of 2x+1:
Answer:
321
Step-by-step explanation:
#/68&$#57:'#46&"¥<>`《\_£=%~《|
Nineteen million, two hundred sixty-six thousand, four hundred twenty! :)
Answer:
y = 60
Step-by-step explanation:
From the information we get:
x quantity of 4 dollars coffee used in the mix
y quantity of 7 dollars coffee used in the mix
For the quantity of coffee to be sold a 7 $/pound ( 90 pounds)
Then 6*90 = 540 $
Therefore
x + y = 90 and
4*x + 7*y = 540
A two equations system we solve for x and y
y = 90 - x
4*x + 7* ( 90 - x ) = 540
4*x + 630 - 7*x = 540
- 3*x = - 90
x = 30 pounds and
y = 90 - 30
y = 60
We should use 60 pounds of the seven $ coffee
