I think its called a sequence
If the number of positive signs is even and the number of negative signs is odd then it is negative and vice versa. If the number of positive signs is even and the number of negative signs is even then the answer is odd. If the number of positive and negative signs are odd then the answer is always negative.
The answer is going to be 4.5
8-18+18a= - 10+18a
18a= 10
a=10/18=5/9
I think is the right ans.. Hope it helps
This app is called photo math u can use it on equations and it gives u the steps/work for the problem
