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## An Engineer That Loves to Teach Math!

### Lebanon, TN (37090)

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# Jim's Responses in WyzAnt Answers

#### FInding Per Hour: Solving

Tyler starts walking at 2 miles per hour. An hour later, Nadine starts jogging along same route at 6 miles per hour. How long will it take Nadine to catch up with Tyler?

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Asked by Barbie from Patriot, OH
20

Let t = the time it takes for Nadine to catch up

Distance Tyler goes in time t is

D = 2 +2t

Distance Nadine goes in time t is

D = 6t

Since the distance each goes is the same

6t = 2 + 2t

4t = 2

t = ½ hour

#### 789 trillion written as a integer?

How do you write 789 trillion as an integer?

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Asked by Jake from Menomonie, WI
10

789,000,000,000,000 789 Trillion

#### Dividing fractions that contain exponents?

I can't seem to figure this one out.  It's more complicated than others I've been doing.  Thank you for your help and explanation!

27n2-147

3n2-16n+21

Divided by...

15n2+32n-7

n2-9n+18

I know the second fraction needs to be flipped for multiplication so it would become:

n2-9n+18

15n2+32n-7

Next is factoring but I can't seem to figure it.

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Asked by Courtnee from Mitchell, IN
00

That fact that there are only 2 term in 27n2-147 may suggest it is a perfect square. And after dividing by 3 it is! 3(9n2-49). Factor each quadratic and cancel and you will find the answer.

#### 2k2+7k-4-0

2k2+7k-4=0

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Asked by Cierra from Chicago, IL
00

Solve by factoring:

= (2k - 1)(k + 4)

= 2k2 + -k +8k -4

= 2k2 +7k - 4

#### X+x+2+x=144

introduction to problem solving

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Asked by Rickelle from Buzzards Bay, MA
00

x + x + 2 + x = 144

3x + 2 = 144

3x = 142

x = 47 1/3

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