Answer:
7x + 7
Step-by-step explanation:
2x + 5x = 7x
5 +2 = 7
So hmmmmm, notice... the boat went up in 3hrs, came back to the starting point in 2hrs, it went up 108km, it came back, well, from 108km to distance 0, so the distance on the way back is just the same 108km
now... let's say the stream has a speed rate of "r", and the boat has a still water speed rate of "b"
bear in mind that, when the boat is going UP, is not really going "b" fast, because the stream's "r" rate is going against it, and thus subtracting "r" from "b", so is really going " b - r " fast
when the boat is going down, is not going "b" fast either, because, again the stream's rate "r" is adding to it, because is going with the current, so is really going " b + r " fast
now, recall your d =rt, distance = rate * time

solve for "r"
what's b? well, 36+ r = b
Answer:
Interpret and compare the data.
Step-by-step explanation:
elim options 1 and 2
analyzing means you don't have findings
Answer:
Here we have the relation between the speed of the salmon and the temperature.
a) the relation dS/dT tell us how the speed of the salmon changes as the temperature changes, and the units should be (if speed is m/s and temperature is in °C )
[dS/dT ] = [m/s*°C ].
b) I can not do a draw of the figure, but i can give a aproximation.
For T = 18°C, we can see that we are around the maximum of the curve, this means that around this point we will find the zero in the first derivate.
then S'(18) ≈ 0 m/s*°C
this means that around this point the changes are small.
for T = 10°C
Around this region, we can see almost a linear behavior.
so we can take a range of +-2°C
S(12°C) = 25m/s
S(8°C) = 20m/s
then the slope can be obtained using the relation:
S = (Y2 - Y1)/(X2 - X1) where this is the slope for the line that goes trough the pairs. (X1, Y1) and (X2, Y2)
S = (25 - 20)/(12 - 8) = 5/4
then we have that S´(10°C) ≈ 5/4 m/s*°C
Those two results are approximations, you may find better approximations by doing this with a ruler and drawing the tangents.
Answer:
Is this a joke?
Step-by-step explanation: