How many pairs of positive integers x and y satisfy the equation x + 2y = 210? A. 29 - 1 B. 29 C. 29 + 1 D. 29 + 2 E. 0Each of the integers from 1 to 9 is to be placed in one of the 9 boxes in the picture so that any three numbers in consecutive boxes add to a multiple of 3. The numbers 7 and 9 have already been placed. In how many different ways can the remaining boxes be filled? 7 A. 9 B. 12 C. 15 D. 18 E. 24A triangular pyramid has edges of integer length. Four of these lengths are as shown in the diagram below. What is the sum of the lengths of the other two edges? 3 7 4 2 A. 9 B. 10 C. 11 D. 12 E. 13