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Naily [24]
3 years ago
6

A professional rower can paddle 320 miles upstream in 10 hours and downstream 320 miles in 5 hours. How fast is the current? (do

n't forget your units)
Mathematics
1 answer:
raketka [301]3 years ago
6 0
Speed upstream  = 320/10  = 32 mph
speed downstream = 320/5 = 64 mph

So spedd of the current  is 64 - 32  = 32 mph
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'y=x+13, xy=30' ????
Art [367]
This is a simultaneous equation. its saying there are two numbers (x and y) that satisfy both equations. Rearrange the 2nd equation to get x=30/y and substitute this into the first equation to get y=(30/y) +13. solve this for y and then you can solve for x.
5 0
3 years ago
Marjorie has 28 feet of trim to use as edging on a rectangular blanket she wants to make. What is the length and width of two bl
Drupady [299]
2L + 2W = 28 feet

One blanket could be;
       2(10) ft + 2(4) ft
The second blanket could be;
      2(7) ft + 2(7) ft

Because...
2(10) + 2(4) = 20 + 8 = 28    and     2(7) + 2(7) =14 + 14 = 28
hope that helps :D
       
6 0
3 years ago
A motel clerk counts his​ $1 and​ $10 bills at the end of the day. He finds that he has a total of 53 bills having a combined mo
dmitriy555 [2]

Answer:

35 one-dollar bills

18 ten dollar bills

Step-by-step explanation:

We can solve this problem by using logic. First we have to understand that if all the 53 bill were $10 bills, then the combined monetary value would be...

53 x $10 = 530$

Now we start to replace the $10 bills with 1$ and each time we replace 1 bill, the combined monetary value will decrease by...

$10 - $1 = $9

We also know that we need to decrease the combined monetary value all the way to $215, which mean there has to be...

(530 - 215) / 9 = 35 one dollar bills.

And now since we know there are 35 one-dollar bills, that means there has to be...

53 - 35 = 18 ten dollar bills

6 0
3 years ago
It takes a turtle 3 1/4 hours to walk 1 1/2 miles. How many hours does it take to walk one mile?
fomenos
195min/1.5 miles so 130 min / 1 mile or 2h 10min (2 1/6h)
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3 years ago
10 to the second power minus 2 x (8) + 11 ​
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95!! Mark brainliest pls
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3 years ago
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