i cant figure this equation out for my math

i cant figure this equation out for my math

i cant figure this equation out for my math

Using digits from this set {1,2,3,4,5,6,78}, how many different 3-digit numbers can be formed if digits can be repeated and the 3-digit number must be odd?

Using digits from this set {1,2,3,4,5,6,7,8}, how many different 3-digit numbers can formed if digits cannot be repeated and the 3-digit number must be odd.

If a boy writes the numbers284 on every page of a tablet that has 284 pages, how many digits Did he write? To solve this question do you multiply 3 x 284 ? Is this a multiplication problem...

adam's house number has three digits. if the leftmost digit of this number is removed, the resulting number is the house of ben. if the leftmost digit of ben's house number is removed, the resulting...

How many 4-digit numbers can be formed using the digits 0 and 1? Repeated digits are allowed.