Find the slope using the following table: (remember you need 2 y-values and 2 x-values to find the change):

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

i believe it is 0.1m because the measurement of 30.4m limits how precise you can be

you can only be as precise as the least precise measurement