What property is illustrated by this problem 65 x 1 = 65

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

[15 points, algebra 2]simplify the complex fraction and find the restrictions.