02-09-2017
Mathematics

contestada

how to find the sum of 2+4+6....+40?

Respuesta :

02-09-2017

Answer 420.
a, is the first term. d is difference.
Since this is an arithmetic progression, I use this formula.
Un = nth term
Sn = sum of terms.
First find the number of terms, which is 20.
Then use the second formula to find the sum.

Ver imagen KhaiLi

Answer Link

Otras preguntas

Steve and Carl are driving from Scranton to Bridgeport, a distance of 180 miles. If their speed averages 60 miles an hour, how long will it take them to get the

The mass of a container is 5.81 kilograms when completely filled with sugar. The mass of the container is 3.8 kilograms when 3/8 of sugar is removed. What is t

A sample of gas confined in a cylinder with a movable piston is kept at constant pressure. The volume of the gas doubles when the temperature of the gas is chan

How do public disclosure requirements protect consumers?

PLease help!!!:):) The light in this diagram is producing light. Which best describes the process of energy conversion to accomplish this? A. The magnetic ener

Which of these formulas contains the most polar bond? (1) H–Br (3) H–F(2) H–Cl (4) H–I

How did the presence of north-to-south flowing rivers in the U.S. affect its development?

A patient receives 150 cc of medication in an IV drip over 4 hours. What is the rate per hour of this dose

Why has the power to regulate interstate commerce become such an important power of Congress?

Which formula represents an ionic compound? (1) NaCl (3) HCl (2) N2O (4) H2O