Help me please. :))

Volume of a cylinder with a radius of 13 in and height of 30 in

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

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?