What additional piece of information must be known in order to calculate the volume of the cylinder below?

Scale factor of 2 is used to enlarge a figure as shown below the area of is 18 in.²

How far could you drive on 50 gallons of gas

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.