the mean age of five boys is 16 years. if the ages of four of them be 15 years, 18 years, 14 years & 19 years then find the age of the fifth boy.

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

What is the difference between regular convex and concave polygons

X-intercept=-5 y-intercept=2 the equation of the line is