Which function represents a vertical stretch of an
exponential function?
y= 2x
y=3•2^x
y= 2^3x

Greetings from Brasil...

Observing the line of the problem we can see that each division represents -1/3. From zero to - 1 we have 3 divisions, then - 1/3 for each division.

From scratch, P is the fifth division, so

P = (- 1/3) x 5

or

just looking at the figure already conclude that P < - 1 and P > - 2

so  {P | - 2 < P < - 1}

or just P < - 1