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NeTakaya
3 years ago
10

Multiply or divide as indicated. x^-8 • x^-2

Mathematics
1 answer:
gladu [14]3 years ago
7 0

ANSWER

\frac{1}{ {x}^{10} }

EXPLANATION

The given exponentiial expression is

{x}^{ - 8}  \bullet {x}^{ - 2}

We simplify using the rule:

{a}^{m}  \times  {a}^{n}  =  {a}^{m + n}

We apply this property to get:

{x}^{ - 8}  \bullet {x}^{ - 2}  = {x}^{  - 8 + - 2}

We simplify to get;

{x}^{ - 8}  \bullet {x}^{ - 2}  = {x}^{  - 10}

We rewrite as a positive index to get;

{x}^{ - 8}  \bullet {x}^{ - 2}  =  \frac{1}{ {x}^{10} }

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Emma is 6 years older than max. Max is 3 years old. Talor is 5 year older than emma. How old is Taylor?
Lemur [1.5K]

Answer:

Taylor is 14.

Step-by-step explanation:

Max is 3. Emma is six years older than Max.

3+6=9

Emma is 9. Taylor is five years older than Emma.

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3 years ago
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A bird leaves its nest and travels 20 miles per hour downwind for x hours. On the return trip, the bird travels 4 miles per hour
Reil [10]

Answer:

The correct answers are:

A) 60 miles; and B) 3.375 hours.

Explanation:

We will use the equation d = rt for this.

For the first leg of the trip, the bird travels 20 miles per hour for x hours.  This gives us the equation

d = 20x

For the return trip, the bird travels 4 miles per hour slower, so 20-4 = 16 miles per hour.  He also travels 6 miles less than the return distance, for x hours:

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To isolate d, we will add 6 to each side:

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d = 16x+6

We will set the two equations equal to one another, since they both equal d:

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Subtract 16x from each side:

20x-16x = 16x+6-16x

4x = 6

Divide both sides by 4:

4x/4 = 6/4

x = 1.5

He travels for 1.5 hours both times.

The first time, 1.5 hours at 20 miles per hour is:

d = 1.5(20) = 30 miles

The original trip is 30 miles.  This makes the entire trip 30(2) = 60 miles.

On the return trip, he travels 30-6 = 24 miles at 16 miles per hour:

24 = 16x

Divide both sides by 16:

24/16 = 16x/16

1.5 = x

If he goes 24 miles in 1.5 hours at 16 miles per hour, we can use a proportion to find the time it takes for the entire return trip:

24/1.5 = 30/x

Cross multiplying,

24*x = 1.5(30)

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24x/24 = 45/24

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This gives him a total time of 1.5+1.875 = 3.375 hours

Step-by-step explanation:

7 0
3 years ago
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3 years ago
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Answer:

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