I hope it's right then!
Clearly a bug in the web2.0calc graphing as it has drawn the square root of the absolute value of x.
"Why when I draw the graph for sqrt(x) it appears to have values for x<0?"
You don't show what your graph looks like. If it looks like the one below then you've plotted the square root of the absolute value of x:
.
lcm(32, 36) = 288
revolutions in 24 hours = 128*3600*24
number of times same teeth together = 128*3600*24/288 → 38400
You do the calculation!
In 1 second a volume pi*(5^2/4)*2 cm^3 approaches the constriction.
In 1 second a volume pi*(3^2/4)*v cm3 leaves the constriction, where v is the speed
, in cm/s, of the water in the smaller pipe.
Equate the two volumes and rearrange to find v.
Plug in the numbers. E is not the answer.
Gauge pressure = rho*g*h
rho = water density
g = gravitational acceleration
h = height
+33667 
