No, A person with AB- can receive from O-, A-, B-, or AB-. See chart on related link. A positive Rh factor can receive from a negative, but not the other way around.
Yes an No. You can have blood type AB in following situations: AO+ BO AA+BB AB+AB So there's more possible ways to get type AB other than the combination of ABs.
Difficult to tell when you cannot use parentheses.
a*(b+c) or a(b+c) = ab + ac
This is known as the distributive property of multiplication over addition.
There is no answer, because no question has been asked. It's only an expression. ab + 4 + a + 4b It can be tidied up a bit: Collect the 'a' terms: a(b+1) + 4 + 4b Collect the '4' terms: a(b+1) +...
