How much is twenty plus thirty

How much is twenty plus thirty

Many: twenty and thirty equal to twenty and thirty are? Twenty plus thirty equal to the number? Twenty and thirty equal to the number? Twenty added thirty equal to how many?

How much is minus one plus three seventeen and four twelve?
1 is negative, others are positive

25 out of 51

Under what conditions is the quadratic trinomial x ^ 2 + PX + q a complete square (P, q are integers)

p^2-4q=0
p^2=4q
p=2q^(1/2) p=-2q^(1/2)
That is, q is a complete square number, such as 1,4,9,16,