Answer:
1.5
Step-by-step explanation:
Given
[tex]f(x) = \frac{1}{3}^x[/tex]
[tex]Options: 0.3\ 0.9\ 1.0\ 1.5[/tex]
Required
What value cause a stretch
For the function to stretch, then the scale factor must be greater than 1.
From the list of options.
Only 1.5 is greater than 1 i.e. [tex]1.5 > 1[/tex]
Hence, 1.5 will cause a stretch.
