What are the solutions to (x+7)^2=81

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.

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

What is the range? can’t seem to find it out