Final answer:
To find the fraction and percentage of veggie burgers out of the total burgers at a university cafeteria, divide the number of veggie burgers (997) by the total burgers (889,875), and then multiply by 100 for the percentage. Regarding the belief in alien visits, multiply 36% by the adult population number (222,000,000) in scientific notation.
Step-by-step explanation:
To calculate the fraction and percent of veggie burgers out of the total burgers consumed at the university's cafeteria, we divide the number of veggie burgers by the total number of burgers eaten. With 997 veggie burgers and 889,875 total burgers, the fraction would be 997/889,875. To convert this fraction to percent, we multiply by 100, giving us (997/889,875) × 100 percent.
For the Kelton Research poll scenario, the percent of adult Americans who believe that aliens have visited Earth is 36%. The total number of adults in the United States is approximately 222,000,000. To find the actual number of adults who believe in alien visits, we need to calculate 36% of 222,000,000. We can express this as 0.36 × 2.22 × 108 in scientific notation.