i think it might be a but you might want a second opinion
what is the question? i am guessing you are looking for the area.
to find an area, you have to do length x width.
in this case, it would be 12 ft x 4 ft = 48 sq. ft
a28=58
step-by-step explanation:
a1=a1+(n-1)d
a28= 4+ (28-1)2
a28=4+(27)(2)
a28=4+54