You decide you will buy a stock only if it shows an overall increase over the next 30 days. In the first 10 days, the stock you chose has an increase of $0.30 per day. The next 10 days, it has a decrease of $0.45 per day. The last 10 days, it has an increase of $0.25 per day.
What was the total amount the stock increased over the first 10 days? You must show your work to receive all possible points.
What was the total amount the stock decreased over the next 10 days? You must show your work to receive all possible points.
What was the total amount the stock increased over the last 10 days? You must show your work to receive all possible points.
What was the total amount the stock changed over 30 days? You must show your work to receive all possible points?
Would you buy the stock based on the criteria of only buying if it shows an overall increase over the 30 day period? Explain why or why not in complete sentences.

A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct or inverse proportional, can be built to find the desired measures in the problem.

Over the first 10 days, the increase was of $0.1 per day, hence the total amount was of:

T = 10 x 0.1 = $1.

Over the next 10 days, there was a decrease of $0.45 per day, hence the total amount was of:

T = -10 x 0.45 = -$4.5.

Over the final 10 days, the increase was of $0.25 per day, hence the total amount was of:

T = 10 x 0.25 = $2.5.

The total change over the 30 days was of:

1 - 4.5 + 2.5 = -1.

The stock decayed $1 over the 30 days, hence you would not buy the stock.

More can be learned about proportions at https://brainly.com/question/24372153

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