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Ierofanga [76]
1 year ago
13

Will mark brainliest, need help ASAP!

Mathematics
1 answer:
nikitadnepr [17]1 year ago
5 0

The percentage of the original sample that is left after 115 days is; 23.4733%

<h3>How to calculate the decay percentage?</h3>

Formula for radioactive decay is;

A = A₀ * (1/2)^(t/t_¹/₂)

where;

A = quantity of the substance remaining

A₀ = initial quantity of the substance

t = time elapsed

t_¹/₂ = half life of the substance

Thus;

A/A₀ =  (1/2)^(115/55)

A/A₀ =  0.234733 or 23.4733%

Read more about decay constant at; brainly.com/question/11117468

#SPJ1

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3 years ago
The speed of a boat in still water is 40 mph. If it takes the same time for the boat to travel 8 miles upstream as it does to tr
antoniya [11.8K]

Answer:

Current speed is 40mph

Step-by-step explanation:

We firstly need to know what is intended by upstream and downstream. When the boat travels in the direction of the current (horizontal movement of the water), we say it is moving downstream otherwise it is moving upstream.

Let's assume the speed of the boat is A and that of the current is B, then the speed when it moves dowstream would be A + B and the speed if it moves upstream would be A – B.

In this question, we know that the speed of the boat is 40mph. Given that it takes the same time to travel 8miles upstream as it does to travel 24miles downstream, we have

Speed upstream = 8/t

Speed downstream = 24/t

Respectively.

Let speed of current be X, then

Speed downstream = 40 + X

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From the question we have:

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