Kenny bought 20 packs of baseball cards. there are 12 cards in rack pack. how many cards did kenny buy?

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

Dylan is evaluation the expression 13+19+7+10 at one step in his work, dylan rewrites the equation as 13+7+19+10 which property of addition must dylan have used when he evaluated the expression?