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rodikova [14]
3 years ago
5

-18x − 2x − 20x − -13x − -9x = 18

Mathematics
1 answer:
Roman55 [17]3 years ago
6 0

Answer:

x = -1

Step-by-step explanation:

-18x - 2x - 20x - (-13x) - (-9x) = 18

First Collect like terms

-18x - 2x - 20x + 13x + 9x = 18

-18x = 18

Divide both sided by -18\

x = -1

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Nachelle goes out to lunch. The bill, before tax and tip, was $8.10. A sales tax of 4% was added on. Nachelle tipped 17% on the
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Step-by-step explanation:

Nachelle goes out to lunch. The bill, before tax and tip, was $8.10. A sales tax of 4% was added on. Nachelle tipped 17% on the amount after the sales tax was added. How much was the sales tax? Round to the nearest cent.

6 0
2 years ago
A friend provides 100 pieces of supporting evidence for a mathematical statement. What is the minimum number of counterexamples
seraphim [82]

Answer:

1 true good statement can prove his friend wrong.

Step-by-step explanation:

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3 years ago
number of bacteria in a certain population Increases according to a continuous exponential growth model with How many hours does
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Answer:

It takes 1.77 hours for the population to double.

Step-by-step explanation:

Equation for population growth:

The equation for population growth, after t hours, with a growth rate parameter of r, as a decimal, is given by:

P(t) = P(0)(1+r)^t

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This means that r = 0.48. So

P(t) = P(0)(1+r)^t

P(t) = P(0)(1+0.48)^t

P(t) = P(0)(1.48)^t

How many hours does it take the size of the sample to double?

This is t for which P(t) = 2P(0). So

P(t) = P(0)(1.48)^t

2P(0) = P(0)(1.48)^t

(1.48)^t = 2

\log{(1.48)^t} = \log{2}

t\log{1.48} = \log{2}

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t = 1.77

It takes 1.77 hours for the population to double.

3 0
3 years ago
A concert hall has 12 seats in the first row, 14 seats in the second row, 16 seats in the third row, and so on. If the pattern c
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Given:

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The objective is to find the total number of seats in the first 12 rows.

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The difference between the number of seats in each row can be calculated by the difference between the successive terms of the series.

\begin{gathered} d=14-12=2 \\ d=16-14=2 \end{gathered}

The number of rows to be calculated is <em>n</em> = 12.

To find the number of seats:

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S_n=\frac{n}{2}\lbrack2a_1+(n-1)d\rbrack

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8 0
1 year ago
Patrica is trying to compare the average rainfall of New York to that of Arizona. A comparison between these two states for the
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