An integer n is called perfect provided it equals the sum of all its divisors that are both positive and less than n. For example, 28 is perfect because the positive divisors of 28 are 1, 2, 4, 7, 14, and 28. Note that 1 C 2 C 4 C 7 C 14 D 28. a. There is a perfect number smaller than 28. Find it. b. Write a computer program to find the next perfect number after 28.

MAT 211 Lecture 3 Section 15.1 (Cont.) Position of Two Planes in the xyz plane can: be parallel OR intersect in a line (called a line of intersection) Ex.: At which line the plane z= 3x2y+6 and the yz coordinate plane intersect yz coordinate plane> x=0 z= 2y+6 Ex.: At which line the...