Question

Let f(x)=8/(1+3e)^(-0.7x)

What is the value of f(-3)

Round your answer to the nearest hundredth.

Answer 1

For x = -3, (-0.7x) equals (-0.7[-3]), or 2.1.
 
                                8                   8                       8
Then f(-3) =  ------------------- = ---------------- = ------------ = 0.31 (approx)
                        1 + 3*e^2.1      1 + 24.499        25.5