Simplify x^2 + ax - 2a^2÷
3a^2 - 2ax - x^2?

Step-by-step explanation:

i) write ax as a difference

ii) write -2ax as a difference

iii) factor out x from the expression

iv) factor out -a from the expression

v) factor out a from the expression

vi) factor out -x from the expression

vii) factor out x+2a from the expression

viii) factor out 3a+x from the expression

ix) factor out the negative sign from the expression and rearrange the term

x) reduce the fraction a-x

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: