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vodomira [7]
3 years ago
6

Three less than a number b is more than 15.

Mathematics
1 answer:
Korolek [52]3 years ago
4 0

Answer:

b-3>15b>18(18 infinity)

Step-by-step explanation:

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Find the length and width of a rectangle whose area is 56 units squared and whose length is 10 units less than it's width
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Answer:

l = 4, w = 14

Step-by-step explanation:

A_r = 56 = l * w

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We substitute the 'l' using the previous formula =>

[tex]A_r = (w -10) \cdot w = w^2 - 10w = 56 =>\\w^2 - 10w - 56 = 0\\

By the quadratic formula we solve for 'w':(we will use the positive value, because we're talking about lengths of planes in a Euclidean space)

w = \frac{10 + \sqrt{100+224} }{2} =  \frac{10+18}{2} = \frac{28}{2} = 14

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