Question

the width of a rectangular picture is 13 in less than the length the area of the picture is 30in 2 what is the length of the picture

Answer 1

Answer:
2 would be your length. The exact length would be 2.3
Explanation:
When we multiply using the formula your answer should always add up to 2.3

Answer 2

Let x represent the length of the picture. Then its width is represented by (x-13) and its area will be
A = length*width
30 = x(x -13)

This quadratic equation can be put into standard form and factored to find the solutions.
x² -13x -30 = 0
(x -15)(x +2) = 0
x ∈ {15, -2}

A negative length makes no sense, so we conclude ...
the length of the picture is 15 inches.