Question

2. For what percentage of time has life existed on Earth (round to the
nearest whole number)?
3. For about how many years of geological time have humans existed on
Earth?
4. For about how many years of geological time have the dinosaurs existec
on Earth?
5. Did dinosaurs exist at the same time as humans?​

Answer 1

Explanation:

The negative sign on an exponent means the reciprocal. Think of it this way: just as a positive exponent means repeated multiplication by the base, a negative exponent means repeated division by the base. So 2^(-4) = 1/(2^4) = 1/(2*2*2*2) = 1/16. The answer is 1/16.