Answer:
Step-by-step explanation:
(a) Perimeter = 2[3x + 5 + 4x - 5] = 14x m
(b) Given perimeter = 42m
14 x = 42
x = 3m
Length = 3x + 5 = 14m
Width = 4x - 5 = 7m
(c) Area = (3x+5)(4x-5) = 12[tex]x^{2}[/tex] + 5x - 25
when x = 4; area = 12*16 + 20*4 - 25
Area = 192 - 80 -25 = 159[tex]m^{2}[/tex]
