If cos(t)=-9/10 where pi < t < 3pi/2, find the values of the following trigonometric functions.
cos(2t)=
sin(2t)=
sin(t/2)=
cos(t/2)=

Solve the inequality. graph the solution. 6q< −18 the solution is .

In pqr the obtuse angle is 105 and the shorter sides measure 4 and 7 units rounded to the nearest tenth what is the area of triangle pqr

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.