Sides AC and BC of triangle ABC are extended as shown. The measures of ∠ACB and ∠ACE are (x+11) and (3x+5), respectively. Find the measure of ∠DCB. Find the measure of ∠ECD.

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

What is a graph with a never ending line called?

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.