How many joules of energy will a stock tank heater rated at 400 watts use in a 48 hour period?
A) 400
B) 400 48 60
C) 400 3600
D) 400 48 3600
Question 2
A problem with ABS detergents is that they
A) are toxic.
B) do not degrade readily.
C) contain phosphates.
D) are less effective in hard water.