Question

Please help! I need number one!

Answer 1

(8+2w)(12+2w)=192

96+16w+24w+4w^2=192

4w^2+40w+96=192

4w^2+40w-96=0

4(w^2+10w-24)=0

4(w^2-2w+12w-24)=0

4(w(w-2)+12(w-2))=0

4(w+12)(w-2)=0, since w>0

w=2

The width of the walkway is 2 feet.

Answer 2

Just add 8+8 12+12  then get your answer and multiply that by each number in the answer box until you get 192