You could say invitability or a foregone conclusion. Invitability just means "the quality of being certian to happen."
Example: "My teacher said it was invitable that she was going to give us a math test tomorrow"
Since it is positive power, the answer is -1 so it is B.
It is (1,15). I recommend using a website called desmos because it helps with graphing.
To find area you multiply the height and width so which ever are the height and width out of those numbers you multiply them together
1/4 off means 0.25 * 28
7
Sale price = 28-7
= 21