Jamal's bookcase has 5 shelves. each shelf holds 15 books. if the shelves are 2-3 full, how many books does jamal have?

If a • b*2 = 1.8 x 10*-7, and c•b/d = 7.2 x 10*-4, find the value of a•d*2/c*2

Alicense plate is to consist of 44 digits followed by 55 uppercase letters. determine the number of different license plates possible if the first and second digits must be? odd, and repetition is not permitted.

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?