Answer:

Step-by-step explanation:
Given
The attached triangle
Required
Find y
The attached triangle is isosceles; so:

Also, we have:
--- angles in a triangle
Substitute: 

Collect like terms


Answer:
-4 ≤x≤1
Step-by-step explanation:
Increasing means that as x goes from left to right, the y value is getting larger
The graph is increasing from -4 to 1
-4 ≤x≤1
Answer:
<em>(B). 319 </em>
Step-by-step explanation:
=
=
x =
≈ <em>319</em>