Question

find the common ratio r for the geometric sequence and use r to find the next three terms 5,15,45,135

Answer 1

Answer: 405

Step-by-step explanation:

ratio r for the geometric  sequence: 5, 15, 45, 135

r is a radios of a circle,

d is the Diameter

r1=5. r2=15, r3=45, r4=135, r5=?

2*r=d

so:

d1=10, d2=30, d3=90, d4= 270

now following the sequence:

r1+d1=r2       5+10=15

r2+d2=r3      15+30=45

r3+d3=r4       45+90=135

r4+d4=r5      therefore 135 + (135*2) = 135+270=405