Answer:
7. A
8. C
9. C
10. A
Step-by-step explanation:
You just have to work each one out. This is very simple.
We get domain from X-axis:
<h2>
0 ≤ x < ∞</h2>
Answer:
A
Step-by-step explanation:
When each input value has one and only one output value, that relation is a function.
Let the rate of the current be x mph and rate of the boat in still water be y mph.
So the relative speed of the boat with the current ( downstream) = y + x and against the current (upstream) it = y - x.
Then , using speed = distance / time:-
y - x = 120/3 = 40
y + x = 120/2 = 60
Adding the 2 equations:-
2y = 100
y = 50
And substituting in the frst equation:-
50 - x = 40
x = 10
Answer:- Rate of boat in still water = 50 mph and rate of the current = 10 mph.
Answer: 70, 420, 170
Step-by-step explanation:
x+6x+x+100 = 660
8x+100=660
8x=660-100
x=560/8=70
