Is number 7 and 4 correct? if not let me know

Can someone me out here and the tell me the greatest common factor

Venita is sewing new curtains. the table below shows the relationship between the number of stitches in a row and the length ofthe row.sewingnumber of stitches length (cm)51 131532024306what is the relationship between the number of stitches and the length? othe number of stitches istimes the length.o. the number of stitches is 3 times the length.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)