#### Answer

a)
Area of 7 ft x 1 ft = 7 ft$^{2}$
Area of 6 ft x 2 ft = 12 ft$^{2}$
Area of 5 ft x 3 ft = 15 ft$^{2}$
Area of 4 ft x 4 ft = 16 ft$^{2}$
b)
The 4 ft x 4 ft plot has the greatest area.
For both sets of plots the square plots had the greatest area.

#### Work Step by Step

Area of a rectangle: $A$ = $l$$w$
Area of a square: $A$ = $s$$^{2}$
$A$ = $l$$w$
$A$ = (7 ft)(1 ft)
$A$ = 7 ft$^{2}$
$A$ = $l$$w$
$A$ = (6 ft)(2 ft)
$A$ = 12 ft$^{2}$
$A$ = $l$$w$
$A$ = (5 ft)(3 ft)
$A$ = 15 ft$^{2}$
$A$ = $s$$^{2}$
$A$ = (4 ft)$^{2}$
$A$ = 16 ft$^{2}$