Let x represent the number of liters of 50% acid Theresa puts into the mix. The the number of liters of 30% acid will be (420-x). The total amount of acid in the final solution will be ...
0.50x + 0.30(420-x) = 0.45(420)
0.20x + 126 = 189 . . . . . . . . . . . . . . . simplify
0.20x = 63 . . . . . . . . . . . . . . . . . . . . . subtract 126
x = 63/0.20 = 315 . . . . . . . . . . . . . . . liters of 50% solution
(420-x) = 420-315 = 105 . . . . . . . . . liters of 30% solution
Theresa should mix ...
105 liters of 30% solution
315 liters of 50% solution
Answer:
A - the real answer is 7
Step-by-step explanation:
g²=49 (square root 49 to get 7)
B) not sure - possibly wrote the negative sign as a mistake
Answer:
The number is 
students
Step-by-step explanation:
From the question we are told that
The population mean is 
The standard deviation is 
The sample size is n = 2000
percentage of the would you expect to have a score between 250 and 305 is mathematically represented as
Generally
So
From the z table the value of 
and 
The percentage is 
The number of students that will get this score is
Answer:it ends at 11:00
Step-by-step explanation:8:30+2:30=11:00
I think it would be 137.1, due to the total being 360. Just subtract.
