Find the units digit of `8^25`

Find the unit digit of (33)^(123)

Find the unit's digit of cube of 8888.

Find the unit digit of (12)^(78)

The tens' digit of a two digit number is less by 3 than the unit digit. If the product of the two digits are subracted from the number, the result is 15. Find the unit digit of the number.

The tenth digit of two digit number is less by 3 than the unit digit. If the product of the two digits are subtracted from the number the result is 15. Find the unit digit of a number.

Find the unit digit of 3^(47) + 7^(52) .