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Black_prince [1.1K]
4 years ago
9

A paddle boat can move at a speed of 14 ​km/h in still water. The boat is paddled 4 km downstream in a river in the same time it

takes to go 2 km upstream. What is the speed of the​ river?
Mathematics
1 answer:
Sonbull [250]4 years ago
3 0
1.20/(14+x) =10/(14-x)    2.20(14-x)=10/(14+x) 3.280-20x=140+10x 4.140=30x 5.x=14/3
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Need help asap NO LINKS!!!<br> Mark as brainllest who ever gets it right
Lilit [14]

Answer:

73384 kilotons

Step-by-step explanation:

=> Total amount the 1st year = 90,000

=> Since after the 1st yr, there was a reduction of 4%, so 100% - 4% = 96% or 0.96

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We know that the formula of a geometric sequence is;

aₙ = a₁ * r⁽ⁿ⁻¹⁾

In which;

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  • a₁ = the first term of the sequence (in this case it would be 90,000)
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Therefore we can finally say;

=> aₙ = a₁ * r⁽ⁿ⁻¹⁾

=> a₆ = 90,000 * 0.96⁶⁻¹

=> a₆ = 90,000 * 0.96⁵

=> a₆ = 73383.54

=> a₆ = 73384 (Rounded to the nearest whole number)

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