what are the answers to this and please tell me the bonus questions

Which math sentence can be used to determine if the triangle is a right triangle?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

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.