I need help with this question please.

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

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left