If angle DCE = 4x + 15 and angle ECF =6x - 5, find angle DCE

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?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?