Which of the following letters has horizontal line of reflection ? d m t v ?

What is sin 7x/4 ? i need on this urgent trig

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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.