Question

I need help and please write out the answer​

Answer 1

Cos inverse of ( 2/9) is equal to 77.1604

Answer 2

`cos^(-1)` (2/9) = 77°

Explanation:

In your calculator, depending on what type you have, there should be a button that says 2nd. There should also be a button that reads cos, which is cosine.

We want inverse cosine, so click 2nd then cos. This should be inverse cos,
`cos^(-1)`.

Your calculator should have
`cos^(-1)` (

So type 2/9 in the parentheses because
`(2)/(9)` is the same as 2 divided by 9.

So it should be
`cos^(-1)` (2/9) in your calculator. Press enter and you should have 77.16041161.

Here are some scientific calculators and where to find their buttons: