How do u do problem 30? how I did
219/625

625
/ \
(5) 125
/ \
(5) 25
/ \
(5) (5)

219 • (5 to the 4th power)
(2 to the 4th power) • (5 to the 4th power)

219 • (5 to the 4th power) = 136,975

2 • 5 = (10 to the 4th power)

10 = 1000 = 0.136875

answer is 0.136875

is that right?
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The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.

Ibelieve it’s b? hopefully