Which expressions product is modeled by the tiles
a. ( x + 1)( x + 3)
b. x (x + 3)
c. 3 (x + 1 )
d. (3x + 1)(x + 1)

The expression which represents a product modelled by the tiles in the given diagram is; Choice A; (x + 1)(x + 3)

According to the question;

From the given tiles;

The group of tiles can be written out as follows;

By factorisation; we then have;

Read more on factorisation;

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this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.