Answer:

Step-by-step explanation:
The systems of equations are
Let us assume the rate of the current be c
Now actual speed against the current is (15 - c)
And, the actual speed with the current is (15 + c)
Here we applied the time formula i.e. distance by speed
Also the upstream time - downstream time = 4
Now the equations are

Answer:
5c^2 +6c +13
Step-by-step explanation:
so we can see than 5c^2
and 13c - 7c are the same = 6c
and 4 +9 = 13
so answer will 5c^2 +6c +13
I hate study island lol and are those supposed to be powers? Like 3 to the power of 8
Add 2 to 13 and then divide by 3/8. subtract 16 and then divide by 2. 12 is your answer
Answer:
They are opposites and parallel.
Step-by-step explanation: