If d=6, there are two real solutions.
Rule if d=discriminant:
d>0, two real solutions
d=0, one real solution
d<0, no real solutions (but there are two imaginary solutions)
80 inches or feet.. I think you are suppose to multiply 40x2 sorry if im wrong
Answer:
I think its optption B, sorry if not
There are two expressions that can work for this: 0.8x and x-0.2x Hope this helps :)