How do i solve this im totally stuck

Mathematics

1 answer:

inysia [295]3 years ago

5 0

The answer is 6 sqrt(5).

When adding or subtracting radicals with coefficients you simply add/subtract the coefficients. If you are familiar with functions with variables, set x = sqrt(5) then we have

18x - 12x

Now it looks like something you are familiar with and it seems like an obvious answer

6x

now replace the x with the sqrt(5) and you get

6sqrt(5)

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Answer:

$V_{E} = -22.5 / 15 = 1.5 miles/minute\\V_{F} = 7.5 / 15 = 0.5 miles/minute$

Step-by-step explanation:

To answer this problem, we must bear in mind that the express train travels 3 times faster than the freight train.

If we call F the distance that the freight train travels and we call E at the distance that the express train travels, we must have the distance between them after 15 minutes it must be 30 miles.

$F + E = 30\\$