What is the fundamental unit of life​

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)