What happens when light runs into object

What is the slope of the line through the points,(-4,2) & (5,-1) who was in paris???? Read the entry on Jonas Salk from Compton's Encyclopedia/The Britannica School Edition, and answer the question beneath the text.Compton's EncyclopediaJonas Salk (1914-1995). For the first half of the 20th century, poliomyelitis, also known as infantile paralysis, was one of the most dreaded diseases to attack young people. By 1955 American physician and researcher Jonas Salk had developed a vaccine that almost eradicated the disease in the United States and other developed countries.Jonas Edward Salk was born in New York City on October 28, 1914. He graduated from the City College of New York in 1934 and earned his doctorate in medicine from New York University's College of Medicine in 1939. While in medical school he had worked with Thomas Francis Jr. on killed-virus immunology studies. In 1942 he joined a group at the University of Michigan working on a vaccine against influenza. The vaccine was perfected in 1953.In 1947 Salk became associate professor of bacteriology and head of the Virus Research Laboratory at the University of Pittsburgh School of Medicine. There he began working on the polio vaccine. Three viruses caused polio, and a vaccine had to be effective against all of them. By 1952 Salk had developed such a vaccine and conducted field tests on children. His findings were published in 1953, and a mass field test was done the next year.On April 12, 1955, the vaccine was released for use in the United States. In 1957 Salk was named professor of experimental medicine at Pittsburgh, and in 1963 he went to San Diego as head of the Institute (later named the Salk Institute) for Biological Studies. In 1977 Salk was awarded the Presidential Medal of Freedom. He died on June 23, 1995, in La Jolla, California.Answer the following question based on the Compton's Encyclopedia reading:What was one of the challenges Dr. Salk faced in his attempt to create a polio vaccine? Dr. Salk did not have enough money to pay for his research and supplies. Dr. Salk had to create one vaccine that was effective against three different viruses. Dr. Salk had to convince government officials to allow him to test the vaccine. Dr. Salk's idea for a vaccine was not supported by other scientists and physicians. Help!!!!!! Math problems What is the difference between reserved, concurrent, and exclusive powers? what is political geography Which of the following terms best describes government contributions of funds?Which of the following terms best describes government contributions of funds?subsidiessponsorshipssecuritiessafeties PLSSSS HELP!!With which statement would both Walt Whitman and the speaker of "When I heard the learn'd Astronomer" agree? A. Teachers always have the answers. B. Classrooms should have strict rules. C. There are many different ways to learn. D. Students should only speak when spoken too. Using the scatter plot, select all the true statements.-There is a strong positive linear association.-There is a weak negative association.-There are 3 gaps on the scatter plot.-There is an outlier at (75, 7).-The trend line is accurately placed. Tara wants to draw rectangles that each have an area of 24 square inches. The length and width of each rectangle are whole numbers of inches. Genes tell cells what to do. true or false Is there a level playing field for individuals'freedom, independence, and equality on an international scale? Which number has only two factors? A: 6B: 8C: 9D: 11 y = 3x +4y = -2A method by solving systems of equations by adding or subtracting to eliminate a variable Taxable income of a corporationa. differs from accounting income due to differences in intraperiod allocation between thetwo methods of income determination.b. differs from accounting income due to differences in interperiod allocation andpermanent differences between the two methods of income determination.c. is based on generally accepted accounting principles.d. is reported on the corporation's income statement. HELP MEEE PLEASE Gilligan sees a ship coming close to the shore he's standing on. He wants todetermine the distance (SD) from the ship to the shore. He walks 130 ft along theshore from point D to point C and marks that spot. Then he walks 23 ft further andmarks point B. He turns 90 and walks until his location (point A), point C, and pointS are collinear.oAnswer the following questions making sure to show all your work.(a) Can Gilligan conclude that triangle ABC and triangle SDC are similar? Why or whynot?(b) Suppose AB = 90 ft. What can Gilligan conclude about the distance of the shipfrom the shore? Explain. In general, do you think that Americans show the proper amount of respect and gratitude to their elders? Why or why not? Provide specific examples to illustrate your positino.? solve this problem as a fraction in the lowest terms Hello I am in Art Class Right Now.I need to know what juxtaposition is.It is a type of art Blake bought a new car. He borrowed $12,500 from the bank. After 4 years he had paid off the loan and paid $1500 in interest. What rate did he borrow at? Include the steps you used to solve the problem and your answer