Which of the expressions are equivalent

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90

What is the domain of the of the exponential function shown below?