10. Solve the equation. e4x + 4e2x − 21 = 0 11. The population of fish in a farm-stocked lake after t years could be modeled by the equation 1000 P(t)= 1+9e 0.61 a. [1 point] Sketch a graph of this equation. b. [1 point] What is the initial population of fish? c. [1 point] What will the population be after 2 years? d. [1 point] How long will it take for the population to reach 900?