Find the exact value of sin ( 2 a. if cos a = 3 /5 . assume a is a quadrant i angle in standard position.

The triangles are similar. what is the value of x? show your work.

Trish receives $450 on the first of each month. josh receives $450 on the last day of each month. both trish and josh will receive payments for next four years. at a discount rate of 9.5 percent, what is the difference in the present value of these two sets of payments?

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