1.595 to 2 decimal points is 1.60 because the second decimal place is nearest to 10.
The formula for finding time is the distance divided by the velocity.So the answer is 100÷30=3.3333...
If you have a calculator, you can use the inverse cos " cos⁻¹ " key. Many upper level books write that as Arccos so as not to confuse you with a negative exponent. We do that because if you take the cosine of any angle, and then the inverse cosine of any angle, it leads you back to the original angle. Think of it as a big "UNDO" button.
To one decimal place, that result is 61.6 degrees.
