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const2013 [10]
3 years ago
12

A population of bacteria is changing exponentially according to the function below. How can you describe the bacteria population

? Select all possible correct answers.
B(t)=400(1.4)^0.8t +2

A) The population is always positive
B) The population is decaying
C) The population is growing
D) The population is approaching a constant value
Mathematics
1 answer:
Hitman42 [59]3 years ago
3 0
A, it's always positive because B(0) = 400
C, the population is growing. you can tell because the base is the rate of growth 1.4 > 1
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The range of the function y=secx-2 is all reals except<br><br> -1 1 -3 -2
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Answer:

For a function y = f(x), the range is the set of all the possible values of y.

In the question you wrote:

y = secx - 2

This can be interpreted as:

y = sec(x - 2)

or

y = sec(x) - 2

So let's see each case (these are kinda the same)

If the function is:

y = sec(x - 2)

Firs remember that:

sec(x) = 1/cos(x)

then we can rewrite:

y = 1/cos(x - 2)

notice that the function cos(x) has the range -1 ≤ y ≤ 1

Then for the two extremes we have:

y = 1/1 = 1

y = 1/-1 = -1

Notice that for:

y = 1/cos(x - 2)

y can never be in the range  -1 < x < 1

As the denominator cant be larger, in absolute value, than 1.

Then we can conclude that the range is all reals except the interval:

-1 < y < 1

If instead the function was:

y = sec(x) - 2

y = 1/cos(x) - 2

Then with the same reasoning, the range will be the set of all real values except:

-1 - 2 < y < 1 - 2

-3 < y < -1

6 0
2 years ago
Which could be the first step in simplifying this expression? Check all that apply. (x^3x^-6)^2
allsm [11]
If the expression is what I understand it is, this is my answer. (x to the third times x to the negative sixth all squared)

First, i would simplify what is inside the parentheses. x^-6 is the equivalent to
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When dividing numbers with exponents, just subtract the exponents. 
3-6= -3     so the simplification of the expression in the parentheses is 1/x^3.

To finish the problem, I would apply the square from outside the parentheses to the values inside them. In this way, the exponent would be multiplied by 2.

Our final answer is 1/x^6.
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Answer:

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Step-by-step explanation:

because this is the answer

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If you quadruple the input of a function in the resulting output is one fourth of the original output what may be true of the fu
REY [17]
Where are the answer choices???
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3 years ago
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Jack broke apart 5x216 as (5x200)+(5x16) to multiply mentally. What strategy did Jack use?
Sveta_85 [38]

For this case we have the following multiplication:

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From here, we apply the distributive property.

We have then:

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Therefore, Jack's strategy is:

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Answer:

Jack's strategy is:

Write the number in an expanded form and then apply the distributive property.

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