How do i find the area of a composite shape but with the formula of a= b•h

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

The function y= x - 4x+ 5 approximates the height, y, of a bird, and its horizontal distance, x, as it flies from one fence post to another. all distances are in feet. complete the square to find and interpret the extreme value (vertex). select two answers: one extreme value and one interpretation.

Which of the following will form the composite function?