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jonestrishy4803
31.07.2019 •
Mathematics
Tom is going to build a fence around his garden which is a rectangle measuring 8 m by 20 m. he will first put in posts which will be 4 m apart. if the posts cost $5.50 each, what will be the total cost for all the posts?
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Ответ:
We have then:
P = 2L + 2W
Where,
L: long
W: wide.
Substituting the values:
P = 2 * (20) + 2 * (8)
P = 56 m
Then, to find the number of posts we have:
N = P / d
where,
P: perimeter
d: distance between posts.
Substituting:
N = (56) / (4) = 14
The total cost will be:
(5.50) * (14) = $ 77
the total cost for all the posts wil be 77 $
Ответ:
Factor out the x in the function, so you get x(x^2-2x-3). Then, factor the quadratic, getting x(x-3)(x+1). Set each part equal to 0.