Answer:
X = 4
Step-by-step explanation:
Start 2800
End 175
175 = 2800x(0.5)^X
175/2800 = 0.5^X
0.0625 = 0.5^X
log(0.5 x) = log(0.0625)
x ยท log(0.5) = log(0.0625)
-0.301x = -1.204
x = -1.204/-0.301
x = 4
3.5m questions
4.5m answers