Which of the following are examples of geometric sequences? State the common ratio and write an explicit rule when applicable.
A: A bank account earns 1.25% interest annually.
B: A shirt is on sale for 15% off.
C: A swimmer reduces his 50-m backstroke by 2% each week of the summer.
D: A teacher hands out 2 pencils every day.

step-by-step explan mxfcg'k; uafwgzfgjhklhgation:

answer is  

c.

36

step-by-step explanation:

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !