A metal worker has a metal alloy that is 30% copper and another alloy that is 55% copper. how many kilograms of each alloy should the metal worker combine to create 90 kg of a 45% copper alloy?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Do,h = (7, 9) (14, 18) the scale factor is

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take