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Anuta_ua [19.1K]
3 years ago
15

Donna is writing a program for her book store that will help her monitor inventory. She has many different kinds of books (ficti

on, non-fiction, textbooks, cookbooks, etc.) that all require different types of data. She has noticed, however, that several pieces of data are the same no matter which type of book she is selling: title and price. She creates some procedures that report the title and price of a book that she can use with any kind of book she sells. This is an example of what computing principle?
Advanced Placement (AP)
1 answer:
maxonik [38]3 years ago
6 0

Answer:

Abstraction.

Explanation:

This is an abstraction because Donna generalized a concept — reporting the title or price of a book — to apply to all types of books. Noticing repeated details or common features and removing them is a key element of abstraction.

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1. The rate at which people enter a movie theater on a given day is modeled by the function S defined by S(t) = 80 -12 cos 6 The
Arlecino [84]

Hi there!

a.

To find the total amount of people that have ENTERED by t = 20, we must take the integral of the appropriate function.

\text{Amount that entered} = \int\limits^{20}_{10} {S(t)} \, dt \\\\ = \int\limits^{20}_{10} {80 - 12cos(\frac{t}{5})} \, dt

Evaluate using a calculator:

= 899.97 \approx \boxed{900\text{ people}}

b.

To solve, we can find the total amount of people that have entered of the interval and subtract the total amount of people that have left from this value.

In other terms:
\text{Amount of people} = \int\limits^{20}_{10} {S(t)} \, dt - \int\limits^{20}_{10} {R(t)} \, dt

We can evaluate using a calculator (math-9 on T1-84):


\text{\# of people} = \int\limits^{20}_{10} {80-12cos(\frac{t}{5})} \, dt - \int\limits^{20}_{10} {12e^{\frac{t}{10}}+20} \, dt

= 899.97 - 760.49 = 139.47 \approx \boxed{139 \text{ people}}

c.

If:
P(t) = \int\limits^t_{10} {S(t) - R(t)} \, dt

Then:

\frac{dP}{dt}  = P'(t)= \frac{d}{dt}\int\limits^t_{10} {S(t) - R(t)} \, dt  = S(t) - R(t)

Evaluate at t = 20:


S(20) = 80 - 12cos(\frac{20}{5}) = 87.844\\\\R(20) = 12e^{\frac{20}{10}} + 20 = 108.669

S(20) - R(20) = 87.844 - 108.669 = -20.823

This means that at t = 20, there is a <u>NET DECREASE</u> of people at the movie theater of around 20.823 (21) people per hour.

d.

To find the maximum, we must use the first-derivative test.

Set S(t) - R(t) equal to 0:

80 - 12cos(\frac{t}{5}) - 12e^{\frac{t}{10}} - 20 = 0\\\\60 - 12(cos(\frac{t}{5}) + e^{\frac{t}{10}})= 0

Graph the function with a graphing calculator and set the function equal to y = 0:

According to the graph, the graph of the first derivative changes from POSITIVE to NEGATIVE at t ≈ 17.78 hours, so there is a MAXIMUM at this value.

<u>Thus, at t = 17.78 hours, the amount of people at the movie theater is a MAXIMUM.</u>

8 0
2 years ago
The use of fossil fuels has improved medicine, sanitation, and agriculture. What is a negative effect of their use?
Lelechka [254]
C Fossil Fuels are not sustainable
4 0
3 years ago
What does Wallace mean when he refers to the “natural, hard-wired default-setting”
pychu [463]
<span>All of us are a product of the culture we are raised in, the rules and regulations that we must follow and the spoken and unspoken world views that are passed on. We see the world from our perspective and our reality, we cannot help it, it is the filter we look at life through. Sometimes without even knowing how prejudiced we are, we form our opinions from the experiences we have had and what we have watched as we were growing up. Everything comes from a place deep within us that helps us make sense of the world and the people in it.</span>
4 0
3 years ago
Advancement in nuclear science have led to new technology which has been beneficial to society.Which technology is a possible cl
prohojiy [21]

Answer:

Nuclear fission

Explanation:

Nuclear science is the field of physics that explains the atomic theory. It also explains the behavior, structure, and component parts of atomic nuclei.

Nuclear fission is used in nuclear power plants.

It is a great deal of radioactive waste that releases a great deal of energy with a little radioactivity.

In this process, the nucleus of an atom splits into two or more smaller and lighter nuclei.

3 0
3 years ago
AP Calculus AB - Differentiating using the Product Rule
faltersainse [42]

Answer:

  h'(t) = (√t)(1 -5t²)/(2t)

Explanation:

First of all, your product rule needs to be written correctly.

  (f(x)g(x))' = f'(x)g(x) +f(x)g'(x)

You have ...

h(t)=\sqrt{t}(1-t^2)\\\\f(t)=\sqrt{t} \qquad f'(t)=\dfrac{1}{2\sqrt{t}}=\dfrac{\sqrt{t}}{2t}\\\\g(t)=1-t^2 \qquad g'(t)=-2t\\\\h'(t)=f'(t)g(t)+f(t)g'(t)=\dfrac{\sqrt{t}}{2t}(1-t^2)+\sqrt{t}(-2t)\\\\h'(t)=\dfrac{\sqrt{t}(1-t^2-4t^2)}{2t}=\dfrac{\sqrt{t}(1-5t^2)}{2t}

4 0
3 years ago
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