Katrina is asked to simplify the expression-3a-4b-2(5a-7b). She writes -3a-4b-2(5a-7b)=3a-4b-10a+14b
Which property allows her to do this?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.