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lawyer [7]
3 years ago
15

Which one is faster 2.52 or 2.12 in knots and by how much in mintues

Mathematics
2 answers:
sukhopar [10]3 years ago
7 0
2.52 knots = 4.66704 kilometers per hour
and 2.12 knots = 3.92624 kilometers per hour
Therefore 2.52 knots is faster.

You have asked for a difference in time in your question, when really the only difference is speed. The difference in speed for this is:
(4.67 / 60) - (3.93 / 60) = 0.012 kilometers per minute difference.

elena-14-01-66 [18.8K]3 years ago
4 0
2.52 because that equals 0.04833274 miles/min.
2.12 equals 0.04066087 miles/min
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Step-by-step explanation:

The area of a rectangle is the length times the width. Since the dimensions are given as functions of x, youre going to have to use FOIL to combine them, then set that answer equal to the given value of 72.

l*w = (x+3)*(x+4) = x^2 + 7x +12 = 72

Subtract 72 on both sides. There is a reason why we'll do this instead of subtracting 12. The quadratic formula will help us to solve for x.

x^2 + 7x - 60 = 0

Apply the quadratic formula

\frac{-7 (+/-)\sqrt{7^2-(4)*(1)*(-60} }{2*1} =\frac{-7(+/-)17}{2}

We cant have a negative x value because that would result in negative dimensions and a negative area, which is impossible in this context. So you want to add the 17 instead of subtracting it.

x = 5 and x = -12

An alternate way is just factoring the trinomial to:

(x+12)(x-5) = 0

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3 years ago
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Step-by-step explanation:

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