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)=

Why do interests rates on loans to be lower in a weak economy than in a strong one

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)