What is the sum of the geometric series in which a1 = −4, r = 2, and an = −128?

hint: r ≠ 1, where a1 is the first term and r is the common ratio.
sn = 1,020
sn = −252
sn = 43,690
sn = −1,020

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

abby has a greater debt becasue she owea 5 more then alan does