The isosceles triangle is missing so i have attached it. 
Answer:
Length of unknown side = 5p + 6
Step-by-step explanation:
In isosceles triangle, two of the sides are equal. In the attached triangle, we see that one of the equal sides is given as 5p + 3.
Thus,the second equal side is also 5p + 3.
Now, perimeter of a triangle is the sum of the three sides.
We have two sides and let the third side be denoted as x. 
Thus;
Perimeter = (5p + 3) + (5p + 3) + x
We are given perimeter = 15p + 12
Thus;
(5p + 3) + (5p + 3) + x = 15p + 12
10p + 6 + x = 15p + 12
Rearranging, we have;
x = 15p - 10p + 12 - 6
x = 5p + 6
 
        
             
        
        
        
Answer:
A is a solution because it is in the shaded area.
Step-by-step explanation:
 
        
             
        
        
        
Answer:
3
Step-by-step explanation:
3² =  9, so  √9 = 3
4² = 16, so √16 = 4.
12 is closer to 9 than to 16, so √12 is closer to √9 than to √16.
√12 ≈ 3 (to the closest integer)
 
        
             
        
        
        
Ok what am I supposed to answer?
        
             
        
        
        
The zeros are (7,0) and (-6,0).