Question

1. What is the common difference of the Arithmetic sequence 20,16,12,..?

2. How many positive numbers are there in this sequencs?

3.Which is the first negative number in this sequence?

4. In which position did the first negative number occur in this sequence​

Answer 1

Answer:

1) -4

Step-by-step explanation:

1) commom difference= second term-firts term

=16-20= -4

Answer 2

Answer:

1=a1=20. and. a2=16

then c=a2-a1

c=16-20

=-4

the common difference of the arithmetic sequence is -4

3. -4