Question

1. Arnie writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with the instruction that they continue the process similarly. Assuming that the process is unaltered and it costs 2 to mail one letter, find the amount spent on postage when 8th set of letters is mailed. Hint: Geometric Progression

A.87380
B.174760
C.41386

2. he formula an= a1 + (n - 1)d can be used to give a formula for the general term of the arithmetic sequence. For example, the sequence 3, 15, 27, 39, 51, ... has a1 = 3 and common difference d = 12, hence a formula for the general term is given by an = 3 + (n - 1)*12 which simplifies: an = 12n - 9 Now your turn: Which of the following is the general term bn of the sequence 20, 18, 16, 14, 12, ... ?

A.bn = 20 - 2n
B.bn = 18n
C.bn = 22 - 2n

Answer 1

Answer:

The value of x as shown in the given figure is __________________ (PQ is a straight line)

Answer 2

Answer:

Arnie writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with the instruction that they continue the process similarly. Assuming that the process is unaltered and it costs 2 to mail one letter, find the amount spent on postage when 8th set of letters is mailed. Hint: Geometric Progression