Calculus is made up of Trig and Algebra. Most people you ask will say that the hardest part of calculus is the algebra. The best advice I can give is to know your unit circle and Pythagoreans Theorem well.
When working with numbers the way people do in everyday life 1+1=2. However, there are times and circumstances when the result is different. For example, 1 pile of sand put together with another pile...
It mainly depends upon the showerhead.
The original generation of showerheads typically dispensed 3.5 to 5.0 gallons per minute (gpm) which would be between 13 and 19 liters.
The first generation of...