Answer:
4 = 15
Step-by-step explanation:
Make them equal to each other first
2x+15=x+30
Put like terms together
x=15
Hope this helped
:)
Let x represent the speed of of boat.
We have been given that the river current is 3 miles per hour.
The speed of boat upstream will be
.
The speed of boat downstream would be
.

We have been given that you travel 2 miles downstream to a marina for supplies, and then you travel 3 miles upstream to a dock.
We can represent this information in an equation as:

Since the speed of the boat is 18 miles per hour, so we will substitute
in above equation and solve for time.







Since time is in hours, so let us convert our given time in minutes.
1 hour = 60 minutes.


Rounding to nearest tenth of minute.

Therefore, it will take approximately 17.7 minutes for the boat to take the trip.
Answer:
last graph
Step-by-step explanation:
Graphs of functions that are ODD, are symmetric about the origin.
Graphs of function that are EVEN, are symmetric about y-axis.
We need to figure out which one of the 4 are EVEN. So we take y-axis as the mirror and see both sides, LEFT and RIGHT and see i the points are symmetric or not.
Graph 1, 2, 3 ---- not symmetric about y-axis
Graph 4 ------- Definitely every point to left side of y-axis has a corresponding mirror point to the right of y-axis. So this is an EVEN FUNCTION.