C. 12 /3 go Brainly! Have Fun
A. Triangle...........................
R = speed in still water
r + c = speed with current
r - c = speed against current
3.5(r + c) = 70
r + c = 20
c = 20 - r
4(r + c) = distance from pier to pier
5(r - c) = distance from pier to pier
4(r + c) = 5(r - c)
4(r + 20 - r) = 5(r - 20 + r)
80 = 10r - 100
180 = 10r
18 = r
The speed in still water is 18 km/hour
Answer: Second option.
Step-by-step explanation:
Given the function f(x), which is:
And given the function g(x), which is:
You need to substiute the function into the function in order to find 
.
Therefore, through this procedure, you get this answer:
You can observe that this matches with the second option.
Answer:
a
Step-by-step explanation:
because i said so now choose is u
