Question

What is the equation of the sequence given? 2500, -500, 100, -20...

Answer 1

for geometric sequences:\[a_{n}=a_{1}*r^{n-1}\]
a1 is the first term (2500) and r is the common ratio. to find the common ratio, simply take any term and divide it by the term before it (ex: if you pick -500, divide by the term before it, which is 2500)

Answer 2

Would it be -0.2

Answer 3

yup, so your r-value is -0.2 (or -1/5 as a fraction)

Answer 4

thank you