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Usimov [2.4K]
3 years ago
8

If your going 70 miles per hour, how many hours will it take you to go 70 miles

Mathematics
2 answers:
Mandarinka [93]3 years ago
3 0
1 Hour
70 miles per hour
ist per hour so in one hour you'll go 70 miles
gavmur [86]3 years ago
3 0
It will take 1 hour to go 70 miles if you are going 70 miles per hour.
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Which are the solutions of x2 = –5x + 8?
Nostrana [21]

Answer:

As exact answers:

x=\frac{-5-\sqrt{57} }{2}  and  x=\frac{-5+\sqrt{57} }{2}

As decimal answers:

x = -6.2749172 ≈-6.3

x = 1.27491722 ≈  1.3

Step-by-step explanation:

For quadratic equations, you can use the quadratic formula. Rearrange the equation to standard from, which is ax² + bx + c = 0.

x² = –5x + 8

x² + 5x - 8 = 0

State the values for "a", "b" and "c",

a = 1; b = 5; c = -8

x=\frac{-b±\sqrt{b^{2}-4ac} }{2a}            (Ignore the Â, it's a formatting error)

x=\frac{-5±\sqrt{5^{2}-4(1)(-8)} }{2(1)}           Simplify

x=\frac{-5±\sqrt{25-(-32)} }{2}               Two negatives make a positive

x=\frac{-5±\sqrt{57} }{2}  

Split the equation at the ± for plus and minus:

x=\frac{-5+\sqrt{57} }{2}  = 1.27491722 ≈ 1.3

x=\frac{-5-\sqrt{57} }{2}  = -6.2749172 ≈ -6.3

Therefore the solutions are 1.3 and -6.3.

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3 years ago
In Example 9.2 (p. 214), if you instead carried the suitcase by the handle so that the suitcase was hanging directly at your sid
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Step-by-step explanation:

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you would do no work

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Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

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