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ella [17]
3 years ago
11

Appropriate units

Mathematics
2 answers:
mestny [16]3 years ago
6 0

Answer:

$/km would be the right answer

Step-by-step explanation:

I did it on khan academy

Novosadov [1.4K]3 years ago
4 0

Answer:

"$/km"

Step-by-step explanation:

He wants to model "maintenance cost" with respect to "distance"

Normally,

maintenance cost would be in currency --- dollars, pounds etc.

distance would be in kilometers, miles, meters etc.

We need to find the ratio that has the COST on top and DISTANCE on bottom

Looking at the choices,

We can eliminate 1st and 3rd immediately as it doesn't have COST on top.

That leaves us with

$/km

and

km/$

$ is in fact currency and unit for cost and km is in fact unit for distance. We need the ratio that has $ on top and km on bottom, that's the 2nd option.

So, $/km is the appropriate unit.

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Orlov [11]

Answer:

Step-by-step explanation:

Eight

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0.32778 = 1 / e^(0.4t)   Notice the sign's gone. Multiply both sides by e^(0.4t)

0.32778 *e^(0.4t) = 1    Divide by 0.32778

e^(0.4t) = 3.0508          Take the natural log of both sides.

0.4t = 1.11542                 Divide both sides by 0.4

t = 2.78855

You should put this in the original equation to see if it checks. It does.

=============================

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3^(3 - 3x) + 6 = 42         Subtract 6 from both sides

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(3 - 3x) ln(3) = ln 36

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- 3x = 0.26186                 Divide by - 3

x = - 0.087287    

4 0
3 years ago
How do I solve this?<br><br> x+1/x-2 &gt; 0
Eduardwww [97]

Answer:

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Step-by-step explanation:

\frac{x+1}{x-2}>0\\ \\x+1>0=>x>-1\\\\x-2>0=>x>2

x ∈ (+ 2 ; +oo)

x+1x

x ∈ (-oo ; - 1)

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The <em><u>correct answer</u></em> is:

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