Eight hundred ninety-one billion, nine hundred sixty-two million, one hundred seventy-two thousand, four hundred nine Write the standard form of the number shown.

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.