CK 2.4.1 and 2.4.2

[冇地位的我]

Class work2.4.1
The 1st term=100-7nx1=93
The 2nd term=100-7nx2=86
The 3rd yerm=100-7nx3=79
The 4th term=100-7nx4=72
Example2.4.2
( a)the general term of the sequence is : -7n
( b)-7,-14,-21,-28,-35,-42,-49,-56,-63,-70,-77,-84,-91,-98,-105,-112,-119,-126,-133,-140
( c)-7n
Class work2.4.2
( a) The nth term=1n,2n,3n,4n.........
( b)The 20th term=1+3+20=24

(雖然以上係答案，但係可能全部都錯）