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

The final products of meiosis are O A. chromatids O B. gametes O c. tetrads O D. centromeres Need help quick

Jane wants to share her pizza with two friends. She wants to make sure they all get the same amount. How should she cut the pizza?

(2/3) i am in need of assistance

Which substance should a student apply to the skin if he or she gets splashed with an acid?

Currently, there are $350$ students in the seventh grade at Winchester Heights Middle School. For the upcoming school year, they are planning to increase the nu

A scientist was studying how a specific virus infects skin cells. In a lab, the scientist exposed a group of skin cells to the virus. Overtime, the number of li

What is the value of x?

Andy and Donald are both running toward the soccer ball during a game. Andy's path is represented by the parametric equations x(t)=24+2/3t,y(t)=8+16t, where t i

the UN partitioning of Palestine resulted in 800,000 Israeli refugees

What’s the median ? Marking Brainliest!!