Gold-198 has a half-life of 2.7 days. How much of the 120 g of the the gold-198 remains after 8.1 days?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Which of the following represents the range of the graph of f(x) below

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.