Answer to Question #170615 in Algebra for Irene

Question

1.May I ask what is the terms in the sequence 10,20,40,80?

2. -5,-25,-125

3. -2,4,10,26

4. -1,4,-16,64

5. 10,-50,250

6. 1,-10,100,-1000

7. 100,50,25,25/2

Answer 1

All the seven questions is based on Geometric progression

Which can be calculated by using

Nth term= AR^n-1

A is equal to first terms, R is equal to common ratios and n is the number of terms, All the numbers of terms can be gotten by counting their numbers as stated by Geometric Progressions (GP)

1) 10, 20,40,80 all the number of terms there is 4

2)-5,-25,-125 all the numbers of terms there is 3

3)-2,4,10,26 all the numbers of terms there is 4

4) -1,4,16,64 all the numbers there is 4

5)10, -50,250 all the numbers there is 3

6)1,-10,100,-1000 all the numbers there is 4

7)100,50,25/2 all the numbers there is 3