Which expression is equivalent to 4s + 4s?

16s
8s
8 + 2s
16s²

What signals you that factoring by grouping is the best method to use when factoring a problem?

Which equation represents the line that passes through the points and (4, 10) and (2, 7)? y = 3/2x - 11y = 3/2x +4y = - 3/2x + 19y = - 3/2x + 16

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?