In a library, bookcases A, B,C, and D are lined up in order. Bookcase A is 1.38 meters from bookcase B and 6.8 meters from bookcase C than the distance between bookcases B and C. How far apart are bookcases C and D?

The second term of an arithmetic sequence is 30. the fifth term is 90.calculatei). the commor difference of the sequence ii). the first term of the sequence tje first, second and fifth terms of the arithmetic sequence are the first three terms of a geometric sequence calculate the seventh term of the geometric sequence