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-BARSIC- [3]
3 years ago
14

Sela has 6 times as many coins as she had 4 months ago. If sela has 240 coins now ,How many coins did she have 4 months ago.

Mathematics
2 answers:
saw5 [17]3 years ago
5 0
She has 40 coins since 40 times 6 is 240.
Lesechka [4]3 years ago
4 0
Sela had 40 coins

240/6=40

If you want to double check multiply 40x6

Your answer will give you 240 which means she had 40 coins 4 months ago
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Work out m and c for the line: y = 10 x
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Step-by-step explanation:

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Initially a tank contains 10 liters of pure water. Brine of unknown (but constant) concentration of salt is flowing in at 1 lite
zhenek [66]

Answer:

Therefore the concentration of salt in the incoming brine is 1.73 g/L.

Step-by-step explanation:

Here the amount of incoming and outgoing of water are equal. Then the amount of water in the tank remain same = 10 liters.

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\frac{dQ}{dt} =\textrm {incoming rate - outgoing rate}

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Outgoing rate = (\frac{Q(t)}{10} g/L)(1 L/ min) \frac{Q(t)}{10} g/min

\frac{dQ}{dt} = a- \frac{Q(t)}{10}

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Integrating both sides

\Rightarrow \int \frac{dQ}{10a-Q(t)} =\int\frac{1}{10} dt

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maksim [4K]

Answer:

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