Simplify the expression:
9d2–7d2+4d2

In the geometric progression –3, 12, −48… what term is 3,072?

Which expression is the factorization of x^2+10+21

Will mark 50 show all what is the solution to the system of equations? use the substitution method and show your work. -5x+y= -3 -15 x+3y=7 explain what your answer in part (a) tells you about the association of the lines in this system.