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3 years ago

Algebra. Am I right?

Mathematics

1 answer:

MaRussiya [10]3 years ago

3 0

The answer to this question is 224. This is an arithmetic series. The first term is with n = 1 into the summand which gives
                             2(1) + 1 = 3
The last term is with n = 14 into the summand which gives
                             2(14) + 1 = 29
There are a total of 14 - 1 + 1 = 14 terms in this arithmetic series.
The formula for sum of an arithmetic series is used to find the sum
                             S = n/2(first term + nth term) = 14/2(3+29) = 224
The answer to this question is 224.

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Answer:

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3 years ago

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4 years ago

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xeze [42]

Answer:

The speed of the river is 2mph.

Step-by-step explanation:

I guess that we want to find the speed of the river.

First, remember the relation: speed*time = distance

If the speed of the river is Sr, when Luvenia moves downstream (in the same direction that the flow of the water) the total speed will be equal to the speed of Luvenia in still water plus the speed of the water:

Sd = 4mph + Sr

and at this speed, in a time T, she can move 21 miles, so we have:

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and in the same time T as before, she moves 7 miles, so we have the equation:

Su*T = (4mph - Sr)*T = 7 mi

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Now we can take the quotient of those two equations and get:

((4mph + Sr)*T)/((4mph - Sr)*T) = 21/7

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4 years ago