The graph of which function has an axis of symmetry at x= -1/4
f(x)=2x^2+x-1
f(x)=2x^2-x+1
f(x)=x^2+2x-1
f(x)=x^2-2x+1

4.6875 pounds

step-by-step explanation:

i can't see the picture : /

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

w'x is 0.

hope it