Answer:
7.5 L of 10% solution and 22.5 L of 30% solution
Step-by-step explanation:
Volume of 10% solution plus volume of 30% solution = total volume of 25% volume.
x + y = 30
Acid in 10% solution plus acid in 30% solution = total acid in 25% solution.
0.10 x + 0.30 y = 30 × 0.25
0.10 x + 0.30 y = 7.5
Solve the system of equations, using either substitution or elimination. I'll use substitution:
x = 30 − y
0.10 (30 − y) + 0.30 y = 7.5
3 − 0.10 y + 0.30 y = 7.5
0.20 y = 4.5
y = 22.5
x = 30 − y
x = 7.5
Sarah needs 7.5 L of 10% solution and 22.5 L of 30% solution.
Answer:
Reject H0 since test statistic <-2.492
Step-by-step explanation:
Given that the American Water Works Association reports that the per capita water use in a single-family home is 74 gallons per day.
n = 25
x bar = 69
s= 8.3
std error = s/sqrt n = 
H0:
Ha: 
(Left tailed test at 5% significance level)
a) Reject H0 if t
-2.492
b) Test statistic = mean difference/std error
= 
=-3.01
df =24
c) Reject H0
Answer:
3/40
Step-by-step explanation:
1/4 x 1/3 - 1/5 x 1/4 +1/4 x 1/6
(1/4 x 1/3) - (1/5 x 1/4) + (1/4 x 1/6)
1/12 - 1/20 + 1/24
1/30 + 1/24
3/40
Also can I plz get brainiest?
Answer: -0.07142857142
I looked the question up on google ;)
Take the cost and multiply by the percent. (I’m going to convert the percentage into a decimal)
14,675 * 0.07 = 1,027.25
$1,027.25 is how much extra money will have to be paid for the car.
Hope this helps.
