nine less than twice a number is 49.
what is the number?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.