I need help, please and thank you

Mathematics

1 answer:

borishaifa [10]2 years ago

5 0

Answer:

See below ↓

Step-by-step explanation:

Problem

$\frac{5x}{x+7} + \frac{7}{x}$

Work

$\frac{5x(x)+7(x+7)}{x(x+7)}$
$\frac{5x^{2} +7x+49}{x(x+7)}$
The student's mistake was that instead of taking x(x + 7) as the LCM (Least Common Multiple), he took x + 7, which is not possible in this case

Solution

$\frac{5x^{2} +7x+49}{x(x+7)}$

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A train goes twice as fast downhill as it can go uphill, and 2/3 feet as fast uphill as it can go on level ground. If it goes 12

Yuri [45]

Answer:

0.5hrs

Step-by-step explanation:

Let the speed downhill be $x$ ,

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