warm up:Area.how many square units will it take to fill up this rectangle?

Answer:
12
Step-by-step explanation:
here's your solution
=> area of rectangle = length*width
=> area 4*3 = 12.squnit
=> area of square = side^2
=> area = 1.squnit
=> Number of square = area of rectangle/area of square
=> no of square = 12/1
=>. 12