10. Consider the set R={4, 16, 64, 256, 1024, ...} a. Is R generated by an arithmetic or geometric sequence? (Which one?) (up to 0.5 point) b. Give set R using set-builder notation. (up to 1.5 points) points c. Give the 38th term of the sequence. (up to 0.5 point) C d. What is the cardinality of set R? (up to 0.5 point)