Which data set is precise based on a correct value of 42? Set 1: 41, 23, 42, 19
Set 2: 41, 42, 41, 43
Set 3: 42, 15, 42, 98
Set 4: 89, 13, 17, 25

What is the percentage composition of carbon in the compound ch4

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3