Answer:
The correct answer is (c) the poll uses voluntary response, so the results tell us little about the population of all adults.
Step-by-step explanation:
You can't conclude (a) because this question hasn't be made to all the Americans.
You can't conclude (b) because the poll doesn't use any convenience for the selection of the sample
You can't conclude (d) because this is not a poll with a premeditated sample, therefore, the size is inconclusive.
You can conclude (c) because the poll was available for anyone who voluntary wanted to answer it.
Answer:
Average speed=52 miles per hour
Step-by-step explanation:
The expression for calculating the average speed is as follows;
S=D/T
where;
S=average speed
D=distance traveled
T=time taken
In our case;
S=unknown
D=130 miles
T=2 1/2 hours=2.5 hours
replacing;
Average speed=130/2.5=52 miles per hour
Average speed=52 miles per hour
Replace all occurrences of + − with a single − . A plus sign followed by a minus sign has the same mathematical meaning as a single minus sign because 1 ⋅ − 1 = − 1 2 − 2 c − 9 c 2
C) {3,4,5,6}
The domain will always be your X value, while the range will always be the Y value.
Hope this helps!
Can a vector have nonzero magnitude if a component is zero?
Yes, a vector can have zero components along a line and still have a non-zero magnitude.
Example: Consider a two dimensional vector 2i + 0j. This vector has zero components along a line lying along the Y - axis and a non- zero component along the X - axis. The magnitude of the vector is also non - zero.
Now, magnitude of 2i + 0j = 
=2
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