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3 years ago

What is the greatest perimeter of a rectangle with an area of 39 square feet?

2 answers:

3 0

-- The smallest perimeter is about 24.98 feet ... that's 4 √39 .

-- There is no 'greatest'. If somebody gives you a gigantic perimeter
with an area of 39 square feet, I can always make a rectangle with the
same area and a bigger perimeter.

Example:

3-ft by 13-ft . . . Area = 39 ft² . . . Perimeter = 32 feet

1-ft by 39-ft . . . Area = 39 ft² . . . Perimeter = 80 feet

6-in by 78-ft . . . Area= 39 ft² . . . Perimeter = 157 feet

1-in by 468-ft . . Area = 39 ft² . . . Perimeter = 936-ft 2-in

0.1inch by 4,680-ft . . Area = 39 ft² . . . Perimeter = 9,360-ft 0.2-inch
(about 1.77 miles !)

poizon [28]3 years ago

3 0

It would be about 1.77 miles I think

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3 years ago

1..A message in a bottle is floating on top of the ocean in a periodic manner. The time between periods of maximum heights is 26

statuscvo [17]

Answer:

See below for answers and explanations (along with a graph attached)

Step-by-step explanation:

Part A

The amplitude of a sinusoidal function is half the distance between the maximum and the minimum. It is given to us that the distance from the highest and lowest point is 6 feet, so our amplitude is 6/2 = 3 feet

Part B

The graph's function would be in the form of $y=acos(bx+c)+d$ where $a$ is the amplitude, $\frac{2\pi}{b}$ is the period, $-\frac{c}{b}$ is the phase/horizontal shift, and $d$ is the average/midline.

We already know our amplitude of $a=3$ from part A.

Since our period is given to us as 26 seconds, then we can use the equation $\frac{2\pi}{b}=26$ to find $b$ , which happens to be $b=\frac{\pi}{13}$ .

Since the cosine function starts at its maximum and we want it to start at the average where the bottle travels up, we would need to use the cofunction identity $sin(x)=cos(x-\frac{\pi}{2})$ which shifts the cosine graph $\frac{\pi}{2}$ units to the right. This means that $c=-\frac{\pi}{2}$ , making our phase shift $-\frac{c}{b}=-\frac{-\frac{\pi}{2}}{\frac{\pi}{13}}=6.5$ , or 6.5 feet to the right

Our average/midline would be $d=12$ as given as the average height by the problem.

Therefore, the function is $f(x)=3cos(\frac{\pi}{13}x-\frac{\pi}{2})+12$

Part C

Using our determined function from Part B, by looking at its graph, we see that the bottle will reach its lowest height of 9 feet after 19.5 seconds (see attached graph).

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3 years ago

Read 2 more answers