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xz_007 [3.2K]
4 years ago
10

Researchers recorded that a certain bacteria population declined from 450,000 to 900 in 30 hours at this rate of decay how many

bacteria will there be in 13 hours
Mathematics
1 answer:
worty [1.4K]4 years ago
5 0

Answer:

30,455

Step-by-step explanation:

Exponential decay

y = a(1 - b)^x

y = final amount

a = initial amount

b = rate of decay

x = time

We are looking for the rate of decay, b.

900 = 450000(1 - b)^30

1 = 500(1 - b)^30

(1 - b)^30 = 0.002

1 - b = 0.002^(1/30)

1 - b = 0.81289

b = 0.1871

The equation for our case is

y = 450000(1 - 0.1871)^x

We are looking for the amount in 13 hours, so x = 13.

y = 450000(1 - 0.1871)^13

y = 30,455

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The amount of money that college students spend on rent each month is usually between $300 and $600. However, there are a few st
Rudiy27
<span>The <u>correct answer</u> is:

A) median.

Explanation<span>:

When measuring the spread of this data, the first thing we note is that $1300 is an outlier; it is much, much different from the rest of the data. Therefore it has the potential to skew some measures of spread. For instance, the mean (not in this list) would be affected, since 1300 will raise the mean higher than it should be.

Since 1300 affects the mean, it also affects the standard deviation, which is the average distance each point is from the mean. Therefore standard deviation is not the best measure to use.

The range will be affected by this value as well, since this is the highest value; without it, the highest would be much less, which would make the range much less. Therefore range is not the best measure.

The interquartile range is not affected much by an outlier, but it is not usually a measure of spread that we use to describe values such as this.

We typically use the median to describe these values; since it is in the middle, it is not really affected by any outliers, and it is not a range from lowest to highest, such as the interquartile range (lowest quartile to highest quartile). Therefore median is the best measure.</span></span>
4 0
3 years ago
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If k(x) = 5x – 6, which expression is equivalent to (k + k)(4)?
borishaifa [10]
(k + k)(4) =
5x - 6 + 5x - 6 = 10x - 12 =
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The answer is 28
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Which is true regarding the graphed function f(x)? The graph is attached and the choices?
aliya0001 [1]

The right answer to the graph of the line with a negative slope is:

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This is read as:

f(x)=y=-1

Then:

When x is 5, the value of y is -1


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5÷540 long divison with a grid​
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Step-by-step explanation:

I really don't have explanation on this.

Why, because it's too hard to explain.

3 0
1 year ago
Need help with this question!!!!
vlabodo [156]

Using the exterior angle of a polygon theorem, the value of the missing angle is 58°

<h3>Calculating the value of a missing angle </h3>

From the question, we are to calculate the value of the missing angle.

From the given information, the missing angle is (3x -2)°.

To calculate the value of the missing angle,

First, we will determine the value of x

From the <em>Exterior angle of a polygon theorem</em>, we can write that

90° + (3x + 12)° + (4x - 10)° + (3x - 2)° + 70° = 360°

(3x + 12)° + (4x - 10)° + (3x - 2)° = 360° - 70° - 90°

3x° + 12° + 4x° - 10° + 3x° - 2° = 200°

10x° = 200° + 2° + 10° - 12°

10x° = 200°

x = 200/10

x = 20

The missing angle is (3x -2)°

Substitute the value of x

(3(20) -2)°

= (60 -2)°

= 58°

Thus,

The missing angle measure is 58°

Learn more on Calculating the value of a missing angle here: brainly.com/question/24524675

#SPJ1

3 0
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