1. The simple interest on an investment is directly proportional to the amount of the investment. An...

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1. The simple interest on an investment is directly proportional to the amount of the investment. An investment of $3250 earns $113.75 after 1 year. Find a mathematical model that gives the interest I after 1 year in terms of the amount invested P.
2. The simple interest on an investment is directly proportional to the amount of the investment. An investment of $6500 earns $211.25 after 1 year. Find a mathematical model that gives the interest I after 1 year in terms of the amount invested P.
3. Use the fact that 13 inches is approximately the same length as 33 centimeters to find a mathematical model that relates centimeters y to inches x. Then use the model to find the numbers of centimeters in 10 inches and 20 inches.
4. Use the fact that 14 gallons is approximately the same amount as 53 liters to find a mathematical model that relates liters y to gallons x. Then use the model to find the numbers of liters in5gallons and 25 gallons.
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