radomes.openskiesproject.org
lilDot88
lilDot88 lilDot88
  • 28-06-2016
  • Mathematics
Answered

12

∑ 20(0.5)^n-1

n=3

Verified Answer :

nobillionaireNobley
nobillionaireNobley nobillionaireNobley
  • 29-06-2016

Assuming n starts from 1.
∑\(20 (0.5)^{n-1}\); n = 1 to 3
\(=20 (0.5)^{1-1}+20 (0.5)^{2-1}+20 (0.5)^{3-1} \\ =20 (0.5)^{0}+20 (0.5)^{1}+20 (0.5)^{2} \\ =20(1)+20(0.5)+20(0.25) \\ =20+10+5 \\ =35\)

Answer Link

Related Questions

Evaluate the expression: $8 \div(-4) \times(-6)^2+7$
Which of the following best describes President Nixons policy of Vietnamization A It was a plan to bring US troops home gradually B It was a plan to stage a mas
the potatoes that arrived in Dublin came from which Andean region
Explain why relations between the Usa and Soviet Union changed in the years 19611963
Who are some important people involved in the Mayflower Voyage
The means and mean absolute deviations of monthly snowfall during the winter months in two cities are shown in the table below Means and Mean Absolute Deviation
the guarantee against double jeopardy protects a person from being tried
If a substance conducts heat easily it is considered to be an
Name one reason that parliament raised taxes
Find the GCF 12 and 45 A 180 B 3 C 45 D 12