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388

Integration Problem.

I was given this problem and being the rebel I am refused to do u-substitution. Instead I did integration by parts. Here is my work and I think it is wrong but can not tell why.
BY PARTS where f = sin(x) and g' = cos(x), f' = read more ..

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Guest Feb 3, 2020

1087

please help

A nurse mixes 70cc of a 60% saline solution with a 30% saline to produce a 36% saline solution. How much of the 30% solution he use?

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Guest Feb 3, 2020

Feb 2, 2020

413

Help with this hard problem

Calamitous Clod rolls a pair of rigged dice. The probability of rolling k on a die is directly proportional to k. What is the probability that the sum of Calamitous Clod's dice is equal to 7?

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Guest Feb 2, 2020

789

+305

Help, thanks

A fish tank is to be filled with water. Originally, the ratio of water to empty space in the fish tank is 1:5. After 130 gallons of water are added, the ratio is 3:2. How many gallons does the tank contain when completely full?

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DragonLord Feb 2, 2020

613

help please

Prove that if 2a^3 + 27c = 9ab, then the roots of x^3 + ax^2 + bx + c = 0 form an arithmetic sequence.

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Guest Feb 2, 2020

472

help

To complete a task In 16 days a company needs 5 people 6 hours a day. How long will it take 8 people 4 hours a day, assuming they work at the same rate

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Guest Feb 2, 2020

682

+262

help

The domain of the function r(x) = is (-inf,1) U (1,inf). What is the range?

My answer was (-inf, -4,] U [0, inf), but that's apparently wrong. what did i do wrong?

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atlas9 Feb 2, 2020

488

Help

Find if the graph of passes through and is parallel to the graph of .

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Guest Feb 2, 2020

682

help

Let L be the line with equation . Let be a vector from the origin to a point on L. Find the minimum value of .

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Guest Feb 2, 2020

809

+312

SUPERBOWL

Today's Superbowl Sunday in the US.... Who are y'all rooting for? KC or 49ers.

off-topic

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mathleteig Feb 2, 2020

504

help

The three consecutive terms of a G.p are the second third and sixth terms of A.p. find the common ratio of the G.p. (G.p = geometric progression, A.p = arithmetic progression)

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Guest Feb 2, 2020

817

+312

INTERESTING PROBLEMS...

1) In a school with 600 students, 317 are in the band and 234 are in the orchestra. If 122 students are in neither band nor orchestra, what is the probability that a randomly selected student is only in band or only in orchestra? Express your answer as read more ..

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mathleteig Feb 2, 2020

647

+11

Casework Probability Question

A bag contains five white balls and five black balls. Your goal is to draw two black balls.
You draw two balls at random. Once you have drawn two balls, you put back any white balls, and redraw so that you again have two drawn balls. What is the probability read more ..

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mathgod06 Feb 2, 2020

958

help

A ladder is leaning against a building. The distance from the bottom of the ladder to the building is 20 ft shorter than the length of the ladder. How high up the side of the building is the top of the ladder if that distance is 10 ft less than the length read more ..

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Guest Feb 2, 2020

-1

711

+202

I need help with this problem

Suppose that is a complex number such that . Find .
Any help would be greatly appreciated!

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Impasta Feb 2, 2020

494

HELP IMPORTANT FAST

How would you solve this?

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Guest Feb 2, 2020

482

Let S={1,2,3,4,5,6}. How many functions f(x) are there from S to S such that f(f(x))=x for all x ∈ S?

I'm not sure how to start with this one...Thanks for the help!

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Guest Feb 2, 2020

389

help

To join the Grand Rapids University Club there is an initiation fee, as well as a monthly dues. The total cost after 8 months’ membership will be $3100, and after 1.5 years, $3850. Find both the initiation fee and the monthly dues.

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Guest Feb 2, 2020

1157

Counting Question

1. How many integers from 1 to 2018 inclusive have a base three representation that contains at least one digit 2?
2. Consider a cube on a table with each of the faces painted a different color. Suppose you were to pick up the cube, turn it read more ..

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Guest Feb 2, 2020

501

7) Find the exact value of sec θ given tan θ = 3 and cos θ > 0.

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Guest Feb 2, 2020

979

5) Find the value of sin θ given cos θ = 0.8 and tan θ < 0. Show all Work

5) Find the value of sin θ given cos θ = 0.8 and tan θ < 0.

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Guest Feb 2, 2020

479

4) Express as a single trigonometric function: Show all Work

4) Express as a single trigonometric function:

sin x(tan x + cot x)

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Guest Feb 2, 2020

935

+16

Find the quotient when $x^9 + 1$ is divided by $x - 1.$

Find the quotient when $x^9 + 1$ is divided by $x - 1.$
I keep on getting a remainder of 2, can somebody help me?

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Thecarl69 Feb 2, 2020

716

+262

help

The domain of the function f(x) = x^4 + 4x^2 + 4 is [0, inf). What is the range?

is this question right?? i keep getting (-inf, inf) when i try to find to domain of this.. ? so i don't even know how im supposed to find the range read more ..

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atlas9 Feb 2, 2020

1069

help

80 machines can produce 4800 identical pens in 5 hours. how many pens produced in 1 hour by 1 machine?

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Guest Feb 2, 2020

All Questions ⁺⁰234777 Questions

Integration Problem.

please help

Help with this hard problem

Help, thanks

help please

help

help

Help

help

SUPERBOWL

help

INTERESTING PROBLEMS...

Casework Probability Question

help

I need help with this problem

HELP IMPORTANT FAST

Let S={1,2,3,4,5,6}. How many functions f(x) are there from S to S such that f(f(x))=x for all x ∈ S?

help

Counting Question

7) Find the exact value of sec θ given tan θ = 3 and cos θ > 0.

5) Find the value of sin θ given cos θ = 0.8 and tan θ < 0. Show all Work

4) Express as a single trigonometric function: Show all Work

Find the quotient when $x^9 + 1$ is divided by $x - 1.$

help

help

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