Annie buys greeting cards each card cost 1.75 she pays with a twenty dollar bill how many cards did she buy

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0