Row 1 of the amphitheater has 17 seats. On each successive row the number of seats increase by 5. If there are 30 rows, how many seats does the amphitheater have

Question

anonymous · Answer

row1-17
row2-22
row3-27
row4-32
row5-37
row6-42
row7-47
row8-52
row9-57
row10-62
row11-67
row12-72\
row13-77
row14-82
row15-87
row16-92
row17-97
row18-102
row19-107
row20-112
row21-117
row22-122
row23-127
row24-132
row25-137
row26-142
row27-147
row28-152
row29-157
row30-162

anonymous · Answer

the theatre has 2685 seats