Answer:
16 quarts
Step-by-step explanation:
Let's say x is the volume of water.
Initially, the amount of antifreeze is the concentration times the volume: 0.90 (8).
After the water is added, the amount of antifreeze is the new concentration times the new volume: 0.30 (8 + x).
Since the amount of antifreeze doesn't change, we can set these equal and solve for x.
0.90 (8) = 0.30 (8 + x)
7.2 = 2.4 + 0.30 x
4.8 = 0.30 x
x = 16
16 quarts of water should be added.
The answer is c because you have to say 27 minus the number minus 3
Answer:
73% of readers who are satisfied with their lives would be described as a sample statistic.
Step-by-step explanation:
The right option is D.
A) The population include all the readers of USA today.
B) The sample includes all the readers that answer the poll, wether they answer Yes or No.
C) A population statistic would be the population proportion. It is not mentioned in the text, and it would have to be estimated from the result of the sample.
D) A sample statistic is the proportion of readers that answer affirmatively the poll (p=0.73).
Simply use the numbers to give a fraction
