請教maths問題

1.the cost $C of hiring a piano is the sum of the deposit $D plus the rental fee. it is known that the monthly rental fee is $R.

a. if Miss Lee fents a piano for n months, use C, D,R and n to formulate a formula for the fequired fee.

b. it is given that to hire a piano, the deposit is $3800 and the monthly rental fee is $250. if Miss Lee hires a piano for 2 years, find the required fee.


2. in the foolowing sequence, the 1st term and the 2nd term are 2 and respectively
. for any positive integer n , the(n+2)th term is the product of the nth term and the (n+1)th term. find the 7th term of the sequence.

2,3,6,18,.....


詳細答案(希望中英對照)thankyou very much!!!