How to add fraction 3/7+ 3/9=

Given the sequence 7, 14, 28, 56, which expression shown would give the tenth term? a. 7^10 b. 7·2^10 c. 7·2^9

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.