Which function forms a geometric sequence when x=1,2,3

That would be B) -2 (3/4)^x   where 3/4 is the common ratio

Thats the second function

Step-by-step explanation:

15.5

step-by-step explanation:

5

∑

n = 1

substitute n = 1, 2, 3, 4, 5 and sum the terms

= + + + 2² + 2³

= 0.5 + 1 + 2 + 4 + 8

= 15.5

people went from manufacturing one object at a time by hand to manufacturing many objects in factories