Question

A sequence is defined recursively using the formula f(n+1)=-0.5f(n). If the first term of the sequence is 120, what is f(5)

Answer 1

the formula f(n+1) = -0.5*f(n) means that each consecutive term is -0.5* the last,

so, to find the second term, multiply the first term by -0.5
to find the third term, multiply the second term by -0.5, and keep going until you find the fifth term f(5)

Answer 2

Okay thanks I got 7.5 is that correct??

Answer 3

yup! good job!