What is the value of a so the line that passes through the points ( a, 15 ), ( -5a-12 , 4) has an undefined slope?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Abag of jelly beans contain 13 pink, green, 20 yellow, 10 black, 7 red, and 11 orange jelly beans. approximately what percent of the jelly beans are pink and yellow?

What is the radical expression that is equivalent to the expression 27 1 over 5?