C = $5.85
$5.85 = 0.35t + 0.6
-.6 -.6
$5.25 = 0.35t
------- --------
.35 .35
15 = t
15 minutes
Answer: Population and sample
Step-by-step explanation:
A population is the complete collection of all measurements or data collected, whereas, a sample is a subcollection of members selected from the complete collection
Answer: The solution is 
Step-by-step explanation:
since we have given that
we need to solve it using area models:
As we know that "In fractions, division is changed into multiplication by reciprocating the next term to make it possible to solve":
So, It turns into model of area "Area of rectangle "
Now, verifying by using numerical operations only.
Hence, verified.
A: Suppose Mr. Moore decides to use 20 seventh graders as the sample. Is this sample a random sample? Explain your reasoning.
Ans: No, because he only chose the seventh graders which is invalid since he wants to have to use the mean height which involves the 6th, 7th and 8th graders.
B: Mr. Moore decides to use a random number generator to select 20 students from the school. Suppose that when choosing 20 students using the random generator on the graphing calculator, Mr. Moore’s sample is all eighth graders. Does that mean the sample is not a random sample? Explain your reasoning.
Ans: No, it is still a random sample. Since he is using a random generator, there is a possibility that the random generator would pick all students from the 8th grade. Unlike the first one, the random generator is not biased towards any grade, it is just a coincidence.
