You would use the distributive property with the negative. So the second x becomes negative, but since the 7 is already negative it becomes positive. Think of it as if you put the two dashes together you can make a plus sign.
<span>circumference is L=2

L=2π9=18π=18*3.14=56.52 in
Answer: </span>circumference is <span>18π or 56.52 in</span>
The answrr is B, 60%. 45/75 equals 60, so it should be 60%.
Im not in this math section yet but i think that you can look it up as a worksheet and find the answer on google.