R=rate of boat in still water
c=rate of current
d=rt
since you're given that the time it takes to travel the same distance downstream and upstream, your equation will be d_1=d_2, or rt=rt
the rate upstream is r-c and the rate downstream is r+c (because the boat's and river's rates add up)
since you know t_1 and t_1 are 5 and 3, you can now set up 2 equations
<u>5*(r-c)=45</u> because (time upstream)*(rate upstream)=distance=45 miles
r-c=45/5=9
<u>3*(r+c)=45</u>
r+c=45/3=15
r-c=9 and r+c=15, so r=12 mi/h and c=3 mi/h
If you have any questions please ask
Answer:
1. 
2. 
3. 
Step-by-step explanation:
When you estimate, you round the numbers up or down. In this case, I'll round 4,377 down to 4,000, because 8 divides nicely into that number. 4,000/8 = 500.
You could estimate it to be about 500.
Hope that helped you.
(You can round your own numbers if you would like, but remember that rounding should make it easier for you to solve!)
The answer is 200. Your welcome
Answer:
y = 3/2 x - 9/4
Step-by-step explanation:
bring all the y's to one side.
4y = 6x-9
divide by 4 to isolate the y
y = 6/4x - 9/4
simplify
y = 3/2 x - 9/4
