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2 years ago

22. Use your model to determine when the volume of oil will get down to 500 gallons.

Mathematics

1 answer:

Helen [10]2 years ago

8 0

Answer:

21. y = 75000·0.935^t

22. after 74.6 days

23. y = 27.8112·1.18832^t

24. 18.8% per month

25. 1748

Step-by-step explanation:

22. It is convenient to use the graphing calculator to solve this problem. The number of days is where the exponential curve has the value 500. It is about 74.55 days. (see the first attachment)

23. y = 27.8112·1.18832^t (see the second attachment)

24. The rate of change is the difference between the base of the exponential and 1, often expressed as a percentage. The time period is the units of t.

(1.18832 -1) × 100% ≈ 18.8% . . . . per month

25. Evaluating the function for t=24 gives y ≈ 1748.30425259 ≈ 1748.

_____

Comment on graphing calculator

A graphing calculator can make very short work of problems like these. It is worthwhile to get to know how to use one well.

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3 years ago

Solve by elimination:

Pie

Answer:

B (5, 13)

Step-by-step explanation:

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To solve by elimination, we want to eliminate a variable. To do this, we must make one variable cancel out.

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This is one of your equations. Set it up with your other given equation.

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Imagine this is one equation. Since every term is negative, you will be subtracting each term.

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Your answer is correct!

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Hope this helps!

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2 years ago

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