Answer:
x=3
Step-by-step explanation:
6x+7=3x+16
Subtract 3x from each side
6x-3x+7=3x-3x+16
3x+7 = 16
Subtract 7 from each side
3x+7-7 = 16-7
3x =9
Divide each side by 3
3x/3 = 9/3
x =3
Call the rate in still water vs;
upstream you have: vs-v=6/4
downstram you have: vs+v=6/3
where v is the rate with which the river flows.
rearranging:
vs-v=3/2
vs+v=2
from the second you have v=2-vs substitute into the first:
vs-2+vs=3/2
2vs=7/2
vs=7 mi/hr
828
It’s just simple multiplication
9514 1404 393
Answer:
- 160 ft (out from the river)
- 320 ft (parallel to the river)
Step-by-step explanation:
Let x represent the length of fence parallel to the river. Then the dimension of perpendicular to the river will be half the remaining fence: (640-x)/2. The total area will be ...
A = x(640-x)/2
This is the equation of a parabola that opens downward. It has zeros at x=0 and x=640, so its axis of symmetry is x = (0+640)/2 = 320. That is, the peak of the area curve is found when x=320.
The dimensions of the garden with the largest area are 160 ft wide by 320 ft long, where the long side is the river side.
Answer:
22, 30
Step-by-step explanation:
52/2=26
26-4=22
26+4=30
30+22=52