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ladessa [460]
3 years ago
10

20% of what number is 80? Help me to understand this please?

Mathematics
2 answers:
Orlov [11]3 years ago
6 0

The answer is 400

You must divide 80 by 20%. to make 20% a usable number you must move the . over two times resulting in the number .20.

Now divide 80 by .20

80/.20=400



photoshop1234 [79]3 years ago
4 0

16 is the answer

thank you

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The population of a small town is decreasing exponentially at a rate of 14.3% each year. The current population is 9,400 people.
KonstantinChe [14]

Using an exponential function, the inequality is given as follows:

9400(0.857)^t < 6000

The solution is t > 2.9, hence the tax status will change within the next 3 years.

<h3>What is an exponential function?</h3>

A decaying exponential function is modeled by:

A(t) = A(0)(1 - r)^t

In which:

  • A(0) is the initial value.
  • r is the decay rate, as a decimal.

For this problem, the parameters are given as follows:

A(0) = 9400, r = 0.143.

The population after t years is modeled by:

A(t) = A(0)(1 - r)^t

A(t) = 9400(1 - 0.143)^t

A(t) = 9400(0.857)^t

The tax status will change when:

A(t) < 6000

Hence the inequality is:

9400(0.857)^t < 6000

Then:

(0.857)^t < \frac{6000}{9400}

\log{(0.857)^t} < \log{\left(\frac{6000}{9400}\right)}

t\log{0.857} < \log{\left(\frac{6000}{9400}\right)}

Since both logs are negative:

t > \frac{\log{\left(\frac{6000}{9400}\right)}}{\log{0.857}}

t > 2.9.

The solution is t > 2.9, hence the tax status will change within the next 3 years.

More can be learned about exponential functions at brainly.com/question/25537936

#SPJ1

7 0
2 years ago
Please help me find x
alisha [4.7K]

Answer: 16.6

Step-by-step explanation:

a² + b² = c²

7² + b² 18²

49 + b² = 324

Subtract 49 from both sides

b² = 275

√b² = √275

b = 16.583

16.583 ≈ 16.6

8 0
3 years ago
Prove the statement using the ε, δ definition of a limit. lim x → 1 4 + 2x 3 = 2
ZanzabumX [31]

You want to prove

\displaystyle\lim_{x\to1}\frac{4+2x}3=2

By the definition of the limit, this means that for any \varepsilon>0, we can find \delta>0 such that

|x-1|.

In order to get the inequality we want, we need to have

\left|\dfrac{4+2x}3-2\right|=\left|\dfrac{2x-2}3\right|=\dfrac23|x-1|

so we can pick \delta=\frac{3\varepsilon}2.

So here's the proof: Let \varepsilon>0 be given, and let \delta=\frac{3\varepsilon}2. Then

|x-1|

\implies\dfrac23|x-1|

\implies\left|\dfrac{2x-2}3\right|=\left|\dfrac{2x+4}3-1\right|

as required.

3 0
3 years ago
Wally Chin, the owner of an ExxonMobil Station, bought a used Ford pickup truck, paying $2,000 as a down payment. He still owes
Ostrovityanka [42]

Answer:

$10,000

Step-by-step explanation:

He has paid $2,000 but still owe 80% of the selling price. If he’s owing 80%, this must mean he has paid only 20% and this said 20% translates to the $2,000.

Now, let the selling price be $x. We know that 20% of $x is $2,000. Let’s write this mathematically.

20/100 * x = $2,000

20x = 100 * 2,000

x = (100 * 2,000)/20 = $10,000

The selling price of the truck is $10,000

8 0
3 years ago
Rei is barricading a door to stop a horde of zombies. She stacks boxes of books on a table in front of the door. Each box weighs
Alinara [238K]

Answer: The answer is \textup{W}=70+30x.


Step-by-step explanation: Given that Rei is barricading a door to stop a horde of zombies by satcking boxes of books on a table in front of the door.

The weight of each box is 30 kilograms and the weight of the table with 8 boxes on the top is 310 kilograms.

So, if 'g' denotes the weight of the table alone, then we have

\textup{g}+8\times 30=310\\\\\Rightarrow \textup{g}+240=310\\\\\Rightarrow \textup{g}=310-240\\\\\Rightarrow \textup{g}=70.

Therefore, the weight of the table without boxes is 70 kilograms.

Now, if 'W' is the total weight of the barricade, then it can be written as a function of 'x', the number of boxes Rei stacks on the table. The expression is as follows -

\textup{total weight of the barricade}=\textup{weight of the table alone}+30\times \textup{number of boxes}.

Thus, the required function is

\textup{W}=70+30x.



6 0
3 years ago
Read 2 more answers
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