1.Consider the sequence -3,9,-27,...
a) the 5th term,
b) the general term,hence the 100th term.
2. Express 500 g as a percentage of 4 kg.
Find the percentage decrease in each of the following cases
a) A decrease form 60 to 45.
b) A decrease from $8 to $6.
3. the price of a TV set decreases from $ 8 800 to $ 7 744.What is the percenttage decrease?
4.A machine is bought for $450 000 and a profit of $9 000 is made.Find the percentage profit.
HELP HELP HELP!!!Maths Homework!!!!!
2007-08-29 9:13 pm
回答 (1)
2007-08-29 11:07 pm
✔ 最佳答案
1.(a) -3, 9, -27, 81, -243The 5th term is -243
(b) General term = -3^n
100th term = -3^100 = 5.15*10^47
2. 500g/4000g * 100% = 12.5%
(a) Percentage decrease = (60-45)/60 * 100% = 25%
(b) Percentage decrease = (8-6)/8 * 100% = 25%
3.Percentage decrease = (8800-7744)/8800 * 100% = 12%
4. Percentage profit = 9000/450000 * 100% = 2%
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