What is 7x^2-8x-9=-3x rounded to the nearest hundredth

Solve the system of equations. y= 2x y= x^2 - 15

Sheila wants to bake six muffins but the recipe is for 12 muffins . this means you only need half of the ingredients listed how much of the of each ingredient does she need? one cup and banana chips ,7 tablespoons oil , two eggs, 3/4 cups flour 1/4 cup walnuts show all you work and justify your answer using a baby toulmin.

What is the anwers for 9+2x=5x-3-x