Mirella4mg Mirella4mg

01-08-2016
Mathematics

contestada

The third term of an arithmetic sequence is 21, and the eighth term is 56. The first term is

Respuesta :

dalendrk dalendrk

01-08-2016

[tex]a_3=21;\ a_8=56\\\\a_8-a_3=5d\\\\5d=56-21\\5d=35\ \ \ |divide\ both\ sides\ by\ 5\\d=7\\\\a_1=a_3-2d\\\\a_1=21-2\cdot7\\a_1=21-14\\a_1=7\\\\Answer:\boxed{a_1=7}[/tex]

Answer Link

Otras preguntas

Which angle is complementary to ∠EAD?

6 x (3+2) divided by 10

Select the correct answer. What is the text structure of this passage?

Priya is comparing two functions: (x) = 10 . y? and g(x) = 3 - 2* to find out which one has greater output values as x gets very large. She notices that f(1) =

Complete the steps to find the surface area of the right prism shown below. Steps Example 1. Write the surface area formula. Surface Area = BA + ph 2. Identify

Let W be an acute angle. Use a calculator to approximate the measure of W to the nearest tenth of a degree. cosW=0.54

How did women in the united states respond to social change brought about by world war 2

Which of the following statements best describes the Jewish religion during ancient times? A. Despite having made it to the Promised Land, they were conquered b

help me pls i have 10 minutes left

Two friends wash cars to make extra money. The profit P(x) of one friend after x days can be represented by the function P(x) = −x2 + 9x + 10. The second friend