Answer:
0.35 Gallons.
Step-by-step explanation:
Since there is already 9/10 in it, you can only pour 1/10 in now. 1/10th of 3.5 is 0.35.
area= x^2+8x+7
a=l*w
l=x+7
w=x+1
a=(x+7)(x+1)
a= x^2+8x+7