2 years ago

I need help with these pre- calculus questions. Please help it is due tonight.

Mathematics

1 answer:

LenaWriter [7]2 years ago

3 0

What are you solving for

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Given that f(x) = x² + 4x, evaluate f(-2). -4 -8 -12

Aleks [24]

f(x) = x² + 4x
so
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answer
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How many times longer does it take light from the Sun to reach Neptune than Mercury? Express this number in standard notation. E

stealth61 [152]

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Answer:

77.6

Step-by-step explanation:

The ratio of light times will be the ratio of distances:

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= (Neptune distance)/(Mercury distance)

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2 years ago

Find the unit vector in the direction of v=(7,-3). (enter exact answers with square roots)

navik [9.2K]

Answer:

$\binom{ \frac{7 \sqrt{58} }{58} }{ \frac{ - 3 \sqrt{58} }{58} }$

Step-by-step explanation:

First, find the magnitude of the vector:

$|v| = \sqrt{( {(7)}^{2} + {( - 3)}^{2}) } \\ = \sqrt{(49 + 9)} \\ = \sqrt{58}$

Then, divide each component of the vector by the magnitude to get the unit vector and rationalise:

$unit \: vector = \binom{ \frac{7}{ \sqrt{58} } }{ \frac{ - 3}{ \sqrt{58} } } \\ = \binom{ \frac{7 \sqrt{58} }{58} }{ \frac{ - 3 \sqrt{58} }{58} }$

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3 years ago