HELP ASAP ROCKY :( ILL GIVE YOU BRAILEST

Evaluate-27 ^4/3/8 a) - 81/16 b) 81/16 c) 16/81

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)

Zach spent 2/3 hour reading on friday a 11/3 hlurs reading on saturday. how much more time did he read on saturday tha on friday