Triangle of cans

A display of cans on a grocery shelf consists of 28 cans at the bottom, 25 cans in the next row, and so on. There are nine rows on a shelf. How many cans are there in the 9th row? How many cans in total are on display?

Correct answer:

a9 =  4
s =  144

Step-by-step explanation:

a1=28 a2=25 d=a2a1=2528=3 n=9  a9=a1+8 d=28+8 (3)=4
s=2a1+a9 n=228+4 9=144



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