What is the value of b in the equation below? 9 Superscript negative 8 Baseline times 9 Superscript negative 2 Baseline = a Superscript b

Miranda is braiding her hair. then she will attach beads to the braid. she wants 1_3 of the beads to be red. if the greatest number of beads that will fit on the braid is 12,what other fractions could represent the part of the beads that are red?

Icould really use some with this question.

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