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

The graph shows the increase in temperature over time in an oven. What is the change in the y-values and x-values on the graph? The change in the y-values is

round 225.286 on a number line and place value chart

50 points! If you can solve it, then you have more than just a brain! (4 answer question)! There are 10 total people in the regular classroom. Each student has

Evaluate 4 E (2n-1) n=1

what was the House of Burgesses?

What was a primary reason for the crumbling of Europe's overseas empires after World War II? A. other nations' rising imperialism B. decreasing value of c

In a reaction to Talc powder lawsuits JNJ stock price dropped 20% from $140 what is the current price

What animal is native to California A. Pika B. Northern pike C. Wild horses D. Fire ants

How do you say I have a dog, a cat, and two Guinea pigs in german?

Describe the graph of the function f(x) = 2x^3 +14x^2 +13x +6. Include the y-intercept, x-intercepts, and the shape of the graph.