Geometric Series

Find the sum of the first $5$5 terms of the geometric sequence defined by $a=2.187$a=2.187 and $r=1.134$r=1.134.

Give your answer correct to two decimal places.

Find the sum of the first $5$5 terms of the geometric sequence defined by $a=-4.186$a=−4.186 and $r=-2.848$r=−2.848.

Give your answer correct to two decimal places.

Consider the geometric series $64+16+4$64+16+4$\ldots$…

Find the sum of the first $7$7 terms.