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Evgen [1.6K]
2 years ago
8

N Squared - N = 90 N =?

Mathematics
1 answer:
mariarad [96]2 years ago
3 0
N^2 - n = 90
n^2 - n - 90 = 0
(n - 10)(n + 9) = 0

n - 10 = 0
n = 10

n + 9 = 0
n = -9

answer is : n = 10 and n = -9
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4 0
2 years ago
One day, he bought 10 pairs of socks for $2.50 each and 3 pairs of shoes for dollars each. He
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2.50(10) + 3x = 135.97, x = 38.66

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This should be pretty simple.

Basically, we know that he bought 10 pairs for 2.50 so that's $25 right there.

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135.97 - 25 = 115.97

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3 years ago
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ΔABC is a 45 - 45 - 90 triangle. The pattern of its sides is as follows:

Each leg = 1 unit (and both legs are that way, since the triangle is isosceles - so two sides are the same)

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So if we know either leg, we multiply by √2 to get the hypotenuse. In reverse, we divide by √2 if we know the hypotenuse to get the measurement of a leg.

Our problem tells us that the hypotenuse AC is 10 units. We divide 10 by √2 to get the measurement of leg AB. Since it's a 45 -45 - 90 triangle, AB = BC.

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= \frac{10\sqrt{2}}{2} = 5\sqrt{2}

Thus, each leg is 5\sqrt{2} [/tex].

6 0
2 years ago
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