59 Answered Questions for the topic Sum

Sum

12d

Evaluate using Limit Definition

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

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
Sum

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!!!!
Sum

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

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.
Sum

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
Sum

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

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. 
Sum

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?
Sum

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?
Sum

12/31/17

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

Thank you in advance!💙
Sum

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
Sum

03/28/17

Prove that these are identities

2cosx - secx = cosx - tanx/cscx
Sum

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
Sum

09/17/16

It took Candice 35mins. walk from his house to the park 20km away. It took her just 25mins. walk back home. What is his average speed

I used in here the formula: Speed=distance/time. Correct me if im wrong, I got 20kph as my answer. I'm quite unsure with it. Can you please show me the correct equation/solution in this word... more
Sum

09/16/16

Johnny spent 1/4 of his money on a new belt. 1/5 of it on a soda and $50 cake. If he had $85 left, how much money did he start with?

Kindly give me an equation here in arriving the answer. Thanks
Sum

09/16/16

Three sandwiches and a hotdog cost $65, while one sandwich and 3 hotdogs $35. How much two sandwiches and 2 hotdogs cost?

I couldn't get the right equation in this word problem. What must be the correct solution?Your best explanation would be a great help. Thanks.
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