In the right triangle abc, cd is the altitude to the hypotenuse ab and m

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

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.