Students log on to the California Virtual Campus with a user name consisting of eight characters: four uppercase letters of the alphabet followed by four digits. How many user names have no repeated letters or digits?

In a circle, a 45° sector has an area of 32π cm2. what is the radius of this circle? 32 cm 12 cm 16 cm 8 cm

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?