The answer is A. y = [x] -2
-2 is the slope when simplified.
F(x)=x^2 - 4x - 4x +16-16-9
=x(x - 4) -4(x - 4) - 25
= (x-4)(x-4) -25
f(x)=(x-4)^2 - 25
the vertex is (4, -25)
the vertex occur at
x = - b/2a and y = (4ac - b^2)/4a
x= - - 8/(2*1)=4
y=[4*1*(-9) - (-8)^2]/(4*1)
= (-36-64)/4 = - 100/4 = - 25
There are <u><em>6.4008 </em></u><u><em /></u><em /><u><em>meters</em></u> in <u><em>21 feet</em></u>
If you need more help I will be glad to help:D
*~"AB84"~*
{(V-v)*2=86(mi)
{(V+v)*2=110(mi)
{(V-v)=43
{(V+v)=55
2V+v-v=43+55
2V=98
V=49(mph)
v=55-49=6(mph)