Answer:
1
Step-by-step explanation:
AC = 5, ao AB = 2.
This means B = -1+2 = 1.
Step-by-step explanation:

Partial Answer:
For #10 the solutions are 2 and 5
Step-by-step explanation:
Solutions for an equation can be x-intercepts, or where it touches the x or horizontal line. The equation in #10 touches the x line at 2 and 5.