Carson and Emily make a poster for school. The poster is in the shape of a rectangle. The length of the poster measures 7 units, and the area of the poster is 42 square units. What is the width of the poster?

To find the width of the poster, we can use the formula for the area of a rectangle:

Area = length x width

Given that the area of the poster is 42 square units and the length is 7 units, we can plug in these values to solve for the width:

42 = 7 x width

To solve for the width, divide both sides by 7:

width = 42 / 7
width = 6

Therefore, the width of the poster is 6 units.