Find the missing side of the triangle​

He expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. if the length is fraction 2 over 3 unit and the width is fraction 1 over 3 unit, what is the perimeter of the rectangle in units? fraction 2 over 3 unit 1 unit 1fraction 2 over 3 units 2 units

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?