Evaluate the geometric series a1= 3 an= -768 r=- 2

it would be great if you could also include the correct formula to use for this problem!

Your friend swims on the school team. in his first four races, his times are 24.7, 23.5, 25.6, and 27.2 seconds. which time listed for his next race would make the range larger?

2.5 milligrams is equivalent to how many grams

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?