What is the solution to x +4 equals 12

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

(01.02 lc) angle abc has point e on ray ba and point d on ray bc. points e and d are equidistant from point b. to bisect angle abc, which of the following needs to be identified for the construction? the distance between points e and d the point in the angle that is equidistant from points e and d the endpoint of rays ba and bc the point outside of the angle that is equidistant from points e and d

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.