Question

An auditorium has 21 rows of seats. the first row has 18 seats, and each succeeding row has two more seats than the previous row. how many seats are in the auditorium?

Answer 1

My answer would be 408 seats i think

Explanation:

what i did was...

21*18=368

r1- +2

r2- +2

r3- +2

r4 - +2

r5- +2

r6- +2

r7-+2

r8- +2

r9- +2

r10- +2

r11- +2

r12- +2

r13- +2

r14- +2

r15- +2

r16- +2

r17- +2

r18- +2

r19- +2

r20- +2

r21- +2 all those 2's together is 40

368+40= 408