1.What is the nth term of the sequence with 4 and 49 as the 5th and the 10th term respectively?

A.an=9n-41
B.an=9n-5
C.an=41-9n
D.an=5-9n

2.What is the sum of all multiples of 4 between 15 and 49?

A.224
B.240
C.288
D.340

3.if three arithmetic means are inserted between – 15 and 9,find the first of these arithmetic means.

A.3
B.– 3
C.– 6
D.– 9