What coordinate expression represents the coordinates of any point after dilation by a scale factor of 2?

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0