Question

Use geometric sequence formulas

Answer 1

Answer:

$\frac{-5}{4}$

Step-by-step explanation:

to tackel these type of qst just concentrate on the qst with calm mind, even your previous qst on arthematic squence can be solved in same fashion.

to solve these type of qst just replace the variable "n" with the required term i.e. 3 in this case

            $d(n) =-5(\frac{1}{2})^{n-1} \\\\= -5(\frac{1}{2})^{3-1}\\ \\ =-5(\frac{1}{2})^{2} \\\\=-5(\frac{1}{4})\\ \\= \frac{-5}{4}$

Answer 2

Step-by-step explanation:

see attached file for your answer