Each electron in an atom has a charge of -1 , and each proton has a charge of +1 . What is the overral charge of an atom that co
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(x-25) = 7 multiply 5 to both sides first
-(x-25) = 35 then expand the brackets
-x+25=35 make x the subject now;
-x=10
x= -10
-(x-25) = 35 then expand the brackets
-x+25=35 make x the subject now;
-x=10
x= -10
The probability of the union of two events is the sum of their probability, minus the probability of their interserction:
If we plug the known values into this formula, we have
From which we can deduce
So, the probability of is a bit less than
, we have to take away all events that belong to B as well: