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If a crowd of people decided to make a human pyramid, with one person on the top row, two on the second, three on the third, etc, and there are 149 rows, how many people participated?

1 un = u1 + (n-1) d un = 1 + (149 -1 ) 1 un = 1 + (148) (1) un = 149 2 Sn= n/2( 2u1 + ( n – 1) d) Sn= 149 / 2 ( 2 ( 1 )+ (149-1 ) 1)= Sn = 71 ( 2 + (148) = Sn= 20164

Suppose that you invest $ 1500 in the bank for 4 years, but this time i have to pay a compound interest rate of 12%. The interest is added to the investment each year and now i have to paid interest .

How is gonna be my money in 4 years?

1500 $ inicial U1 = 1500x (.12) amount after 1 year

(180$)U2= 1500x(.12)2 after 2 years (360$)U3 =1500x (.12)3 after 3 years (540$)U4 = 1500x (.12)4 after 4 years (720$)Un+ 1 = Un x (.12)n = amount after n

years d= 180

Yahoo anwers and the text book pag 443.

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