Help with num 9 please. thanks​

See Below.

Step-by-step explanation:

We want to show that the function:

Increases for all values of x.

A function is increasing whenever its derivative is positive.

So, find the derivative of our function:

Differentiate:

Simplify:

Since eˣ is always greater than zero and e⁻ˣ is also always greater than zero, f'(x) is always positive. Hence, the original function increases for all values of x.

The missing angle is 32°.