Recall your d = rt, that is, distance = rate * time
now, bear in mind, that hmm, if say, the boat's speed in still water is say "r", when the boat is going upstream, is not really going at "r" speed, but the stream is subtracting from it, so is really going at " r - 4 " mph fast, since the speed rate of the stream is 4
now, when the boat is going downstream, is going "with" the stream, so is really going faster than "r", is actually going at " r + 4 " mph fast
now, the time it took upstream, is the same time it took downstream... say it took "t" time
thus

solve for "r"
Answer:
125x + 150
Step-by-step explanation:
5 (25x + 30)
5 * 25x + 5 * 30
5 * 25x = 125x
5 * 30 = 150
5 (25x + 30) = 125x + 150
Answer:
<em>12.5 songs</em>
Step-by-step explanation:
2/5 of 1 minute is 24 seconds, so assuming that all the songs on your playlist are 48 seconds long, you can listen to about 12.5 songs.
<em>(60 seconds x 10 = 600) divided by 48 seconds</em>
Answer:
9
Step-by-step explanation:
The confidence interval is related to margin of error ; according to the relation :
Confidence interval = mean ± margin of error
Margin of Error = (upper boundary value - lower boundary value)
Confidence interval = 16.5% and 25.5%
Margin of Error = (25.5% - 16.5%)
Margin of Error = ±9
The domain of g is (-infinity, infinity) or all real numbers