What is 65 percent as a decimal pls and how do u get the answer

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Hurry which expression is equivalent to 3√x^5y?