You buy a computer for $3000. It depreciates at the rate of 20% per year. Find the value of the computer after the given number of years. a. 1 year b. 3 years c. 5 years

Some sentences in the following passage contains an italicized vocabulary word or related form. After you read the passage, you will complete an exercise.

Dr. Charles Drew: Physician and Scientist

Dr. Charles Richard Drew $(1904-1950)$, an American physician and scientist, was internationally recognized as the leading authority on the preservation of human blood for transfusion. Without his work on blood plasma, numerous lives would have been lost needlessly during World War II. His pioneering efforts in blood research were also responsible for the foundation of blood banks, which continue to save lives today.

Charles Drew began his medical career at MoGill University in Montreal, Canada. He became interested in blood research as an intern. In $1938$ a Rockefeller fellowship for advanced training allowed him to pursue this interest at Columbia University's Presbyterian Hospital, where two years later he would be awarded the Doctor of Medical Science degree, actually a Ph.D. in medicine. Charles Drew was the first American black to receive this degree.

Working on techniques for synthesizing and preserving blood, Dr. Drew paid close attention to the special properties of plasma, the fluid portion of blood. Presupposing that plasma could be preserved for future emergency transfusions, he spent as much as eighteen hours a day gathering data to support this idea. In $1939$ he tested his theory empirically by setting up an experimental blood bank. His hypothesis was valid; unlike whole blood, plasma could be stored more than one week and could be administered to a person of any blood type. Drew's doctoral thesis, Banked Blood: A Study in Blood Preservation, dealt with the development of the blood bank and with the preservation and transportation of plasma. The treatise remains a definitive study of the subject.

As World War II began in Europe, Dr. Drew had further opportunity to verify his findings. He was appointed medical supervisor of the "Blood for Britain" project, which supplied Britain with badly needed blood plasma. Although some physicians at first rationalized that whole blood was preferable, Drew showed them that plasma was more efficient, especially in emergencies, when speed was crucial. After Britain no longer needed American aid, Drew was appointed director of the American Red Cross program for collecting and banking blood for the American armed services. Dr. Drew's work for both programs constituted a rebuttal to the conventional assumption that wartime casualties could be treated only in hospitals. Formerly it had been axiomatic that battlefield transfusions were impossible. Now the emergency use of plasma repudiated this idea. Trained technicians could administer the life-saving plasma, sometimes in a matter of minutes.

In peacetime Drew's work remained important as blood banks continued to save lives. Drew spent the rest of his career in various teaching and administrative posts at Howard University, where he became head of the department of surgery.

Dr. Charles Drew died of injuries resulting from a car accident. His death was ironic: in desperate need of a blood transfusion, he did not reach a hospital in time.

Each of the following statements corresponds to some sentences in the passage. Each statement contains a blank and is followed by four answer choices. Decide which choice fits best in the blank. The word or phrase that you choose must express roughly the same meaning as the italicized word in the passage. Write the letter of your choice on the answer line.

Formerly it had been $\underline{?}$ that battlefield transfusions were impossible. ___________

a. self-evident b. a consideration c. a disgrace d. controversial

You are preparing a computer presentation to be digitally projected onto the wall of your classroom. Your computer screen is 13.35 inches wide and 10.6 inches high. The projected image on the wall is 53 inches wide and 42.4 inches high. Are the two shapes similar? If so, find the scale factor of the computer screen to the projected image.

On January 1, 2016, Sophie’s Internet Cafe owned 10 computer terminals valued at $8,000. During 2016, Sophie’s bought 5 new computer terminals at a cost of$1,000 each, and at the end of the year, the market value of all of Sophie’s computer terminals was $11,000. What was Sophie’s gross investment, depreciation, and net investment?

You are preparing a computer presentation to be digitally projected onto the wall of your classroom. Your computer screen is 13.25 inches wide and 10.6 inches high. The projected image on the wall is 53 inches wide and 42.4 inches high. Are the two shapes similar? If so, find the scale factor of the computer screen to the projected image.

Of what does the block diagram model for a computer consist?

List the five major hardware components of a computer system.

In a science fiction movie,a huge explosion occurs on the surface of a planet. People in a spaceship heading toward the planet see and hear the explosion. Is this realistic? Explain.

Covalently bonded solids, such as silicon, an element used in computer components, are harder than some pure metals. Research theories that explain the hardness of covalently bonded solids and their usefulness in the computer industry.

use a computer to provide a portrait of the given function g(x, y). To do this, (a) use the computer to help you understand some of the level curves of the function, and (b) use the computer to graph (a portion of) the surface z = g(x, y). In addition, mark on your surface some of the contour curves corresponding to the level curves you obtained in part (a).

$$g(x, y) = x^2 − xy$$

On your own computer or on a lab computer, find the exact location (folder or directory name) of a. The sample file hello.py, which you wrote with the editor. b. The Python program launcher python or python.exe.

Sketch or computer plot a graph of the function $y=e^{-x^{2}}$

A team is excavating an archeological site. The original plan was to excavate a rectangular area 35 ft long by 20 ft wide. Instead, the team decided to excavate a similar rectangle that is 50 ft wide. Find the length and the area of the new rectangle.

How do scientists benefit from computer technology?