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# Jhomny reality series project

## on Feb 12, 2012

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Math Studies Sequ

Math Studies Sequ

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## Jhomny reality series projectPresentation Transcript

• Jhomny yang yupi
• 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.