ANYONE GOOD AT MATH CAN PLEASE HELP ME???

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

Define the type of sequence below. 7, 14, 28, 56, 112, a. neither arithmetic nor geometric b. arithmetic c. both arithmetic and geometric d. geometric

One angle of a linear pair is 10 more than two-thirds the other angle. find the measure of both angles.