What is n in 2/3(1 + n)=-1/2n

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.

Which of these angles are complementary? a. 45o and 45o b. 63o and 117o c. 45o and 135o d. 90o and 45o

Write a rule that expresses the number of quarts q of a liquid as a function of the number of pints p a. q(p) = 1/2qb. q(p) = 1/2pc. p(q) = 1/2qd. p(q) = 1/2p