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

What type of language should be used in a critical analysis essay?

How to saturated triglycerides compare to unsaturated triglycerides in how tightly they pack together?based on this information,which of these triglycerides is

1.How does inertia affect a person who is not wearing a seatbelt during a collision? 2.How does kinetic energy affect the stopping distance of a vehicle travel

Which of the following is a major contribution of ancient Athens of western civilization? a. Monarchy b. Monotheism c. Writing D Democracy

Students are driven to soccer games in vans. Each van holds 9 students. How many vans are needed for 31 students? Give you 1000000000000 points or more!!!!!!!!!

Find the value of 45 – 0.023

Peggy is putting flowers in vases. she puts either 2 or 3 flowers in each vase. if Peggy has a total of 12 flowers, how many different ways can she place them a

How can cars be made to be more fuel efficient?

What is the volume of a cube, if the length of one side is 7 feet? a. 343 cubic feet b. 294 cubic feet c. 21 cubic feet d. 49 cubic feet

If the government deregulates the airline industry then: