Eduardo thinks of a number between 1 and20 that has exactly 5 factors. what number is he thinking of?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.