I would go with A. while it's true that the function continues to increase the function only begins to increase when it's greater then or equal to -8.
(3/5)w + (2/5)x - 8 is the appropriate expression. Be sure to use the parentheses as shown.
135 degrees since all of its sides are congruent.
1080 divided by 8 equals 135 degrees
The formula for a vertex form equation is

in which (h,k) represents the vertex
Your equation is in vertex form, if you mpve the -7 to the other side you will get

because you have to add 7 to both sides
based on the equation,
h=10
k=7
(h,k)=(10,7)
your vertex is (10,7)