A single cell of bacterium E. Coli would divide every 20 minutes under ideal circumstances. The general formala for exponential growth for "doubling" is:A=A0(2)tnwhere A= End amount, A0= the start amount, 2 because it is doubling t= the time elapsed and n= the period of time for the substance to double.a. If the culture starts with 4 bacteria, what is the equation for the number of bacteria after "t" minutes?A=22t20b. Given that equation, determine to the nearest minute when there would be 1024 bacteria. Show your calculations and answer any word problems with a sentence to put your solution in context.c. Using the same equation: If the mass of one bacterium is 10-12 grams, what is the mass of the bacteria after 12 hours