Me. i'm confused. consider the following geometric sequence. -5, 10, -20, if the recursive formula for the sequence above is expressed in the form a^n=b*^n-1, determine the value of b. b= (choices are 2, -2, 5, -5)

To keep cylindrical tanks from tipping over, a designer is planning to enlarge the original area of the base by 50%. the new tank should have the same volume as the original. how should the designer change the height of the tank? a: make it 50% taller than the height of the original tank. b: make it 6623% taller than the height of the original tank c: make it 3313% shorter than the height of the original tank d: make it 50% shorter than the height of the original tank.