Answer:
38.74
Step-by-step explanation:
Hello, I think I can help you with this.
in a standard calculator you will find the inverse cosine function as the second function of the cosine key
so
[tex]cosine\ inverse=cos^{-1} \\[/tex]
step 1
once the calculator is on, press the shift key and then the cosine key, then write the number and close the parenthesis, finally press the equal key
shift ⇒cos⇒0.78⇒)⇒=
in the display you will see( DEG mode)
[tex]cos^{-1}(0.78)\\\ 38.7394246\\[/tex]
Now, approximate
38.7394246\≈38.74[tex][/tex]
Have a great day.
