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maksim [4K]
1 year ago
11

The amount of caffeine in the body of a healthy adult after drinking espresso decreases exponentially, with a half-life of appro

ximately 6 hours. That is, every 6 hours, the amount of caffeine in the body decreases by 50%. Charlotte wants to go to sleep at 11 pm and does not want more than 20 milligrams (mg) of caffeine in her system at that time. What is the latest time Charlotte can drink a 2-ounce shot of espresso that contains 80 mg of caffeine?
A. 5 am

B. 11 am

C. 11:30 am

D. 12 pm

Mathematics
2 answers:
yarga [219]1 year ago
7 0
After 6 hours the amount of caffeine 40 mg. After another 6 hours the amount of caffeine is 20 mg. It takes 12 hours for the total amount of caffeine to drop down to 20 mg. the answer is 11 am -B. Hope this helps!
Pachacha [2.7K]1 year ago
7 0
Please let me know if you have any questions!

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Find the percent of change. Round to the nearest tenth, if necessary.
S_A_V [24]

Answer:

20.487%

Step-by-step explanation:

divide the second number by the first. then do one minus that number

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2 years ago
The first three terms of a geometric sequence are shown below. x+3,-2x2-6x,4x3+12x2,.... What is the eighth term of the sequence
nika2105 [10]
So hmm is a geometric sequence, meaning, the next term is found by multiplying it by "something", namely the "common ratio"

now, if the next term is the product of the common ratio and the previous term, that means, if we divide the previous term by the next term, the quotient will then be the "common ratio", let's do that then

let's divide the 2nd term by the 1st term then

\bf \cfrac{-2x^2-6x}{x+3}\implies \cfrac{-2x\underline{(x+3)}}{\underline{(x+3)}}\implies \boxed{-2x}\impliedby \textit{common ratio}\\\\
-----------------------------\\\\

\bf n^{th}\textit{ term of a geometric sequence}\\\\
a_n=a_1\cdot r^{n-1}\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{value of first term}\\
r=\textit{common ratio}\\
----------\\
a_1=x+3\\
n=8\\
r=-2x
\end{cases}
\\\\\\
a_8=(x+3)(-2x)^{8-1}\implies a_8=(x+3)(-2x)^7
\\\\\\
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\\\\\\
a_8=-128x^8-384x^7
8 0
1 year ago
Read 2 more answers
Phil has 3 times as many rocks as Peter. Together, they have 48 rocks. How many more rocks does Phil have than Peter?
Ivan
Let x = the number of marbles for Phil
Then 3x = the number of marbles for Peter
Together they have 3x+x=48 or 4x=48 and x=12
So Phil has x = 12 marbles and Peter has 3x, let x = 12, 3(12) = 36 marbles.
Peter has 24 more marbles than Phil.
3 0
2 years ago
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One factor of the function f(x) = x3 − 8x2 + 17x − 10 is (x − 5). Describe how to find the x-intercepts and the y-intercept of t
kozerog [31]

Answer:

x-intercepts: (1,0), (2,0), (5,0)

y-intercepts: (0,-10)

Step-by-step explanation:

One factor of the function f(x) = x^3-8x^2 + 17x-10 is (x-5).

Factor the polynomial in the following way:

x^3-8x^2 + 17x-10\\ \\=x^3-5x^2-3x^2+15x+2x-10\\ \\=x^2(x-5)-3x(x-5)+2(x-5)\\ \\=(x-5)(x^2-3x+2)

Now factor the quadratic in brackets:

x^2-3x+2\\ \\=x^2-2x-x+2\\ \\=x(x-2)-(x-2)\\ \\=(x-2)(x-1)

Hence,

f(x)=(x-5)(x-2)(x-1)

The x-intercepts are points at which y = 0, so

(x-5)(x-2)(x-1)=0\\ \\x-5=0\ \text{or}\ x-2=0\ \text{or}\ x-1=0\\ \\x=5\ \text{or}\ x=2\ \text{or}\ x=1

The y-intercepts are points at which x = 0, so

y=0^3-8\cdot 0^2+17\cdot 0-10=-10

4 0
1 year ago
Read 2 more answers
A soda factory has a special manufacturing line to fill large bottles with 2 liters of their beverage. Every process is computer
Drupady [299]

Answer:

z= \frac{2.1-1.98}{0.08}= 1.5

And we can use the normal standard table and the complement rule and we got:

P(z>1.5)= 1-P(Z

And the best answer would be:

C 0.07

Step-by-step explanation:

Let X the random variable who represent the amount of soda filled in large bottles and we know this:

\mu = 1.98, \sigma =\sqrt{0.0064}= 0.08

And we want to find this probability:

P(X> \mu +1.5 \sigma = 1.98 +1.5*0.08 =2.1)

And for this case we can use the z score formula given by:

z=\frac{X -\mu}{\sigma}

And replacing we got:

z= \frac{2.1-1.98}{0.08}= 1.5

And we can use the normal standard table and the complement rule and we got:

P(z>1.5)= 1-P(Z

And the best answer would be:

C 0.07

7 0
1 year ago
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