Idont undertand this coding problem (java):
enter item name that blackbeard needs? sea biscuit
what is the price of one sea biscuit? 1.12
enter quantity of sea biscuits: 3
blackbeard's money calculating program
by: your name here
3 sea biscuits: $3.36
tax (8.25%) 0.28
total due: 3.64
how much did blackbeard pay? 5.00
change due to blackbeard: 1.26
dollars: 1
quarters: 1
dimes: 1
nickels: 1
pennies: 1

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?