monigod monigod

21-03-2017
Mathematics

contestada

Find the sum of the first 90 terms of the sequence –4, –1, 2, 5, 8, ...

Respuesta :

ghanami ghanami

21-03-2017

Hello :
-1-(-4) =2-(-1)=5-2=8-5=3 ( arhtmitic sequence r= 3)
Un = U1+(n-1)r
U90 = -4+(90-1)(3)= 263
sum = n/2 (U1 +U90)
sum = 90/2(-4+263) = 11655

Answer Link

jjolk97 jjolk97

27-05-2020

Answer:

11655 is correct

Step-by-step explanation:

Answer Link

Otras preguntas

mike bought 30 cupcakes, he gave 18 cupcakes to his classmates. write the percentage of cupcakes left

rutherford called the region that deflected alpha particles

What is one reason Europeans began relying on African labor for their plantations in the Americas?

AHH HELPPPP !!!! -In the following diagram, two parallel lines are cut by a transversal. The measure of which angle is equal to the measure of angle 1 ? a - ang

Please help I been getting bots lol I need help asap <3 thanks

Use the decimals 1.57, 7.17, and 5.6 to write two different addition facts and two different subtraction facts.

At a street fair, t-shirts sell for $5 apiece. Ronald has already sold $65 worth of t-shirts, and he has 6 t-shirts left to sell. Write a function to show the t

SOMEONE HELP ASAP!!! PLAeASE eXPLAIN HoW U DID IT TOO

45 KG object has a momentum of 225 KG•m/s northward what is the objects velocity

Pls help I have 10 minutes