25% is equal to 1/4. If 3 bars is 1/4 of a box, then there are 3*4 = 12 bars in a box.
The answer you're looking for is f(2x-9)
It's all real numbers between 65-115$ inclusive. Because Jeremy says he will deposit 50-100 and then the grandmother will add 15$ to that so the total amount will be 65-115
DECA=10, decagon = 10 sides.
since each side is 1.8 long, all 10 sides will be 10*1.8 or 18 units long, so that'd be the perimeter then,