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Lapatulllka [165]
3 years ago
5

Please help me in this:

Mathematics
1 answer:
Svetlanka [38]3 years ago
4 0
What exactly do you need help with?!
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A motorboat covers the distance from one pier to the other pier in 4 hours and the way back in 5 hours. What is the speed of the
aleksklad [387]
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
3 0
3 years ago
5y-x=10 solve for y
shusha [124]
5y-x=10\\\\ 5y=10+x \ |:5 \ Both \ sides \\\\ y=\frac{10}{5}+\frac{x}{5}\\\\ y=2+\frac{x}{5}

because
5y-x=5(2+\frac{x}{5})-x=5\cdot 2 +\frac{x}{\not5}\cdot 5 - x= 10+x-x=10



3 0
3 years ago
Solve the following:<br> 4x3 = 2x + 7
Yuri [45]

Answer:

If you meant 4x to the third power, than x = 1.34

8 0
2 years ago
Wendell’s dog, Jordan, was getting in his way as he worked in the backyard. So, Wendell chained him to a pole. If the chain is 1
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48 feet I think is right

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⚠️How do I solve this in descending order⚠️
Pani-rosa [81]
Rational. There’s nothing further that you can do with this problem
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