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62 Answered Questions for the topic Sum

finding an sum equation - Combinatorics

I need help finding an equation for the next formula and getting rid of the SUM sign

12/01/19

Evaluate using Limit Definition

Evaluate1∫(x+x^2)dx0by using the limit definition. (Hint ∑k=1 k^2 = n(n+1)(2n+1)/6 )

08/06/19

mathematics whole numbers

a group of 3 adults and 10 children bought a ticket to watch dance performance. each adult ticket cost $7 more than each child ticket. the group paid a total of $125. what was the cost of each... more

07/07/19

Use the sum-to-product formula to simplify the expression: If sin41∘+sin19∘=sinA∘,0<A<90, then A= ____degrees

please provide all steps for the solution!!!!

05/05/19

I want to find the exact sum of the power series.

I have the power series (n3^n-1)/(2^2n) going from 1 to infinity. How do I find the exact value for the series. I believe that we just use a power series function that we already know and based off... more
Sum Quotient

09/25/18

two numbers have a sum of 44. The quotient of the larger number and three is 12 more than the smaller number. Find the numbers.

two numbers have a sum of 44. The quotient of the larger number and three is 12 more than the smaller number. Find the numbers.

09/14/18

what is the gcf and sum of 15 and 60

15 + 60 The sum of the numbers as a product of their GCF is
Sum

09/11/18

the sum of a and -3 is -4

The sum of a 
Sum

09/05/18

if the sum of twice a number and negative 7 is increased by 8 the result is 16 greater than the opposite of the number what is the number

if the sum of twice a number and negative 7 is increased by 8 through 16 greater than the opposite of the number what is the number

08/02/18

!!!!!algebra 2 question! need help ASAP!!!!!!

Explain why we can have a converging infinite series when 0 < r < 1. Hint: Use "sum of a finite geometric series" as a basis for your explanation.                                           ... more
Sum Law Maths

07/01/18

Sum of direction angles of vector [0,1,0] is?

pi/2, 0, pi or 3pi/2? Also explain plz thank you. 

05/12/18

Calculating upper and lower limits for a linear function

I am asked to calculate the lower limit and upper limit (L5 and U5) for the linear function y=13-3x, between x=0 and x=4.   I have found that Δx=4/5, and that x0 =0. However, I am getting my... more
Sum

04/22/18

It takes a month for a horse, two months for a goat and three months for a sheep to eat a cart of hay.

It takes a month for a horse, two months for a goat and three months for a sheep to eat a cart of hay. How many months does it take for a horse, a goat and a sheep to eat a cart of hay together?

02/11/18

How can I find convergence of this sum, without using the integral test: (sum goes from 1 to inf)

∑(sqrt(n+2) - 2sqrt(n+1) + sqrt(n))  
Sum

01/11/18

sum of two numbers

the sum of two numbers is 20. one is three more than the other. What are the numbers?

12/31/17

Kind of polygon with the sum of interior angle is 900°

Thank you in advance!💙

10/18/17

the conjugate of a sum is the sum of the conjugates of the individual complex numbers

please help I have no idea what this means and I need the work to show how to do it

Find the sum of the arithmetic sequence. -1, 2, 5, 8, 11, 14, 17

A. 56B. 63C. -7D. 20

03/28/17

Prove that these are identities

2cosx - secx = cosx - tanx/cscx

02/08/17

The sum of 4 numbers is 60 word problem

The sum of 4 numbers is 60.   The first number was increased by four The second number was decreased by four The third number was multiplied by four The fourth number was divided by... more
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