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mylen [45]
3 years ago
15

A rectangle is 18 inches long and 9 inches wide. Find it’s area.

Mathematics
1 answer:
galina1969 [7]3 years ago
4 0

Answer:

162 square inch

Step-by-step explanation:

Area = Length * Width

Area = 18*9=162

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Huilan is 15 years younger than Thomas. The sum of their ages is 33 . What is Thomas's age?
Sphinxa [80]

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6 0
3 years ago
The equation h=7sin(pi/21t)+28 can be used to model the height, h, in feet of the end of one blade of a windmill turning on an a
satela [25.4K]

Answer:

7 feet is the length of the blade of the windmill.

Step-by-step explanation:

We have the equation

h = 7 sin(pi/21t) + 28 ------ eq1

At time 't' = 0, the end of the blade is pointing to the right parallel to the ground meaning it is at the same height as the other end. (Ф = 0°)

So, by calculating the maximum height of this end at  Ф = 90°. we can calculate the length of the blade.

Now, we know that a general model equation of a circular simple harmonic motion is represented as :     y = A sinωt + k ----- eq2

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ω is the angular frequency.

Comparing eq1 and eq2:

A = 7

so the difference in blades end height at Ф = 0° and Ф = 90° is 7 feet.

Hence, the length of the blade is 7 feet.

4 0
3 years ago
Read 2 more answers
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