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There is no symbol between 20 and 30.
Assuming you mean n2 + 11n + 30, the factors are (n + 6)(n + 5).
N+18=30. Subtract 18 both sides N=12
It depends on the value of n.
70
10
Let the unknown number be n.Then 20 + n = 30 : Subtract 20 from both sides gives :-20 - 20 + n = 30 - 20 : n = 10
Assuming you mean n2 + 11n + 30, the factors are (n + 6)(n + 5).
N+18=30. Subtract 18 both sides N=12
It depends on the value of n.
1. n + 3*5 = 30 2. n + 15 = 30 3. n + 15 = 30 - 15 -15 n = 15
70
10
20 = 5 + n/3 15 = n/3 n = 45
e.g. 5n-30=-20 30+30 which then cancels out 5n=-20 5n over 5 which cancels to just n n=-20 -20 +30 which is 10 and 10 divided by 5 which is 2 n=2 CHECK YOUR WORK 5x2-30=-20 use a calculator to check or do it in your head
N=3.
3n + 6 = n + 202n = 14n = 7
20° 30' n