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pav-90 [236]
3 years ago
12

Task is to construct two brick columns of the dimensions shown on which an iron gate will eventually be hung. Because

Mathematics
1 answer:
Anna35 [415]3 years ago
4 0

Answer:

224 in²

Step-by-step explanation:

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What is the opposite of -3/4

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Suppose a ball is dropped from a height of 16 feet. Each time it drops h feet, it rebounds 0.81h feet. Find the total distance t
Roman55 [17]
When the ball is first dropped, it falls h feet. On the first bounce, it rebounds 0.81h feet, which means on the second "drop" it must travel 0.81h feet again. On the second bounce, the ball rebounds 0.81(0.81h)=0.81^2h feet, and on the third drop falls the same distance. And so on.

So there are two directions to track:

\text{downward: }\displaystyle h+0.81h+0.81^2h+\cdots=\sum_{n=0}^\infty 0.81^nh
\text{upward: }\displaystyle 0.81h+0.81^2h+\cdots=\sum_{n=1}^\infty 0.81^nh

The total distance is the sum of these two:

\displaystyle\sum_{n=0}^\infty 0.81^nh+\sum_{n=1}^\infty 0.81^nh=h+2h\sum_{n=1}^\infty 0.81^n

Recall that for an infinite geometric sum, you have

\displaystyle\sum_{n=0}^\infty r^n=1+\sum_{n=1}^\infty r^n=\frac1{1-r}

provided that |r|. So the total distance traveled by the ball is

h+2h\left(\dfrac1{1-0.81}-1\right)\approx9.53h

Starting with a height of h=16 means the total distance is about 152.42 ft.
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3 years ago
Somebody please help a brother out :))
andrew11 [14]

Answer:28 should be it

Step-by-step explanation:

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How to extract a square root?
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Solve equations of the form a x 2 + c = 0 by extracting the roots. Extracting roots involves isolating the square and then applying the square root property. After applying the square root property, you have two linear equations that each can be solved.

Step-by-step explanation:

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