Thursday

December 8, 2016
Total # Posts: 2,882

**Physics**

The heat of fusion for water is 3.3 x 105 J/kg. How much heat energy is needed to can 3kg of ice at 0°C to water at 0°C? Show your work. Help please!! Don't give the answer, but please help me find the answer?! Thanks

*December 7, 2016*

**Calculus**

What would the smallest positive integer be for n if: y=sinx and y^(n) means the nth derivative of y with respect to x.

*December 6, 2016*

**Math**

Find d^2y/dx^2 at point P(2,1) if y is a differentiable function of x satisfying the equation: x^3+2y^3=5xy

*December 5, 2016*

**Math**

The average score on a recent test was 75%. One of the students earned a grade of 93% while another student earned a grade of 78%. A total of 23 students took the test. Find the average grade of the remaining 21 students.

*December 1, 2016*

**College alegbra**

A rancher wants to create a fence enclosing 1500 m2 of land. The plot will be divided into two equal areas by an additional fence parallel to two sides as shown in the diagram below. Find the dimensions of the plot which results in using the least amount of fencing. a. Write ...

*November 30, 2016*

**Math**

Find the integral ?(x^2-6x+1)/(x^2+1) dx

*November 30, 2016*

**Math **

If I spent 1/3 of my money on a pen and 4/7 on books how much do I have left?

*November 29, 2016*

**Math**

How many 6-inch long pieces of ribbon can be cut from a piece that is 3 yards long?

*November 29, 2016*

**Chemistry**

What volume of hydrogen, reacting with nitrogen, will produce 500 dm^3 of NH3 at STP?

*November 27, 2016*

**Math algebra**

If f(x) =2x-1, then f^-1(x)=???

*November 27, 2016*

**Trig**

What are the focus and directrix of the parabola represented by the equation:8(y-6)=(x+2)squared?

*November 21, 2016*

**English**

Poem Meaning "I had sat within that marble circle where the Oldest bard is as the young, And some orient dawn had found me kneeling On the threshold of the House of Fame" Flower of Love by Oscar Wilde

*November 20, 2016*

**Math**

Didn't work

*November 18, 2016*

**Math**

Find the average value of the function over the given interval and all values of x in the interval for which the function equals its average value. f(x) = 4x3 ? 3x2, [?1, 2]

*November 18, 2016*

**art/history**

which of the following is not an element of baroque or rococo architecture a movement b columns c ornamentation d minimalism

*November 16, 2016*

**math**

the mass of a moon rock is 3.5 kilograms what is the moon rock in grams

*November 14, 2016*

**Social Studies **

How did early humans use fire?

*November 13, 2016*

**math- Trigonometry **

A wire is attached to a cell phone tower at Sunshine Village. The wire is 15.6m in length, and the angle of elevation is 54°. What is the distance between the wire and the base of the cell phone tower, along the ground, correct to the nearest tenth of a unit?

*November 12, 2016*

**math- Trigonometry**

Ok thanks. But you are sure it is 100% correct right? I'm sorry I'm just asking because I have a test this week and I'm stressed out..

*November 11, 2016*

**math- Trigonometry **

A laser pointer attached at the top of a lighthouse emits a beam that makes contact with a ship in the ocean below. The length of the laser beam is 9.8km. If the ship is 4.0km from the base of the lighthouse, determine the measure of the angle of depression, correct to ...

*November 11, 2016*

**Calculus **

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find the dimensions that ...

*November 3, 2016*

**Calculus **

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find the dimensions that ...

*November 3, 2016*

**Calc**

Find the length and width of a rectangle that has the given area and a minimum perimeter. Area: 50 square feet

*November 3, 2016*

**Calculus **

Find the particular solution that satisfies the differential equation and the initial conditions. f''(x) = x^2 f'(0) = 8, f(o)=4 f'(t) 10t - 12t^3, f(3) =2

*November 1, 2016*

**Calc**

A baseball is thrown upwards from a height of 2 meters with an initial velocity of 10 meters per second. Use the fact that -9.8 meters per second squared is constant acceleration due to gravity to answer the following: The maximum height of the ball The time it takes for the ...

*November 1, 2016*

**Health and Physical Education**

weight to height

*October 28, 2016*

**Maths**

Work out the area of an equilateral triangle, with side lengths a, in sure form.

*October 27, 2016*

**physics**

A uniform vertical glass tube open at the lower end and sealed at the lower end is lowered into sea water thus trappung the air int he tube . It is observed that when the tube is submerged to a depth 10 meters the sea water has entered the lower half of the tube . To what ...

*October 27, 2016*

**Calc**

Find the particular solution that satisfies the differential equation and the initial condition. f '(s) = 10s − 4s3, f(3) = 7 & f ''(x) = 6, f '(2) = 14, f(2) = 19

*October 26, 2016*

**Math**

How many times greater is the 8 in the hundreds place then the 8 in the ones place explain your answer

*October 25, 2016*

**geometry**

well if you're going to be rude... you might as well get off this site.

*October 24, 2016*

**Math **

Evaluate 2n up3 -3b, if n=3 and b=1. 1.8 2.9 3.15 4.21 5.33

*October 20, 2016*

**Math**

If 9 apples cost $8.1 how much would 5 apples cost

*October 17, 2016*

**Economics **

Consider the following simplified economy described by a Cobb-Douglas production function with three factors of production: “K” is physical capital (the number of machines), “L” is labor (the number of workers), and “H” is human capital (the ...

*October 13, 2016*

**Spanish**

which word fits the sentance best A horse is called a ______________. A frog is called a ______________. A school is called a _____________. A kangaroo is called a _____________.

*October 13, 2016*

**Math**

Ramon planted 3 rows of seeds. He put 8 seeds in each row. Each row of seeds were 42 inches long. How far apart did Ramon plant the seeds

*October 13, 2016*

**Pre-Calc**

I know its supposed to be 1000 feet, but I just don't know how to get there. Any help would be great! Thanks so much:)

*October 11, 2016*

**Pre-Calc**

After release at ground level, a balloon rises 100 feet in 30 seconds. During each succeeding 30 seconds, it rises 9/10 as far as it did in the preceding 30 seconds. What is its maximum altitude above ground level?

*October 11, 2016*

**math**

look im not trying to be rude but the only reason everybody come on this site is to get answers so if you don't mind could you just give me the answers plz

*October 11, 2016*

**math**

Choose the symbol that completes the statement. 3/4_-5/6 a.< b.> c.= -1 3/4_3/4 a.< b.> c.= 2 3/4_2 4/6 a.< b.> c.= please help me can you give me the answers plz

*October 11, 2016*

**Pre calc**

A local salesman receives a base salary of $575 monthly. If his total sales receipts for the month exceed $1800, he also receives a commission of 11% on the portion of sales over $1800. How much would he have to sell in a month if he wants to have a monthly income of $2200?

*October 10, 2016*

**Chemistry**

What would be the wavelength of a 50-gram golf ball traveling at 40 meters/second? Is this large enough to be observable?

*October 10, 2016*

**Science**

What conflicts between humans and robots might occur in the future? Plzz Help!

*October 7, 2016*

**Astronomy**

Suppose we detect red photons at 674 nanometers emitted by electrons dropping from the n = 3 to n = 2 orbital in hydrogen. The hydrogen is in an interstellar cloud at 5,000 K. If the cloud were heated to 10,000 K, what would be the wavelength of the photons emitted by the ...

*October 6, 2016*

**Math**

thxs for not giving me such a hard time

*October 5, 2016*

**Math**

you give everbody else the answer the answer why cant u now please just give me the answer

*October 5, 2016*

**Math**

can u just do the other ones

*October 5, 2016*

**Math**

okay look I don't understand it can u just give me the answer plz and then ill work them out about how I got them

*October 5, 2016*

**Math**

I understand it I just need help please help me im a connexus studentso just please help me plz if u can

*October 5, 2016*

**Math**

1.which symbol completes the statement 3\8 - 1\4 a.> b.< c.= 2.which symbol completes the statement 5\8 - 11\16 a.> b.< c.= 3.which symbol completes the statement 4\6 - 6\9 a.> b.< c.= 4.order the following fractions from least to greatest 3\8,3\4,5\16,1\2. ...

*October 5, 2016*

**Algebra **

Two cars are traveling at 40 and 50 miles per hour, respectively. If the second car starts out 5 miles behind the first car. How long will it take the second car to overtake the first car?

*October 3, 2016*

**math**

A comparision Den

*September 30, 2016*

**Math**

The diameter of my trundle wheel is 50cm. I use it to measure the length of the school park. It rotates 87 times. What is the length of the car park, to the nearest metre?

*September 28, 2016*

**science**

How do I make an acrostic poem for reactants?

*September 28, 2016*

**american government**

4 is c, wtf is wrong with yall? who cares if leslie tries or not. leave her alone, you're all dumb pieces of sh*t. especially ms sue

*September 25, 2016*

**Calculus**

Find the set of points that the following function is continuous at them . f(x)= { (2x+1)/(x+3) if x<0 (√(x+4)-2)/2x^2-3xx if x>0 -1/3 if x=0

*September 25, 2016*

**Calculus **

Find all the values of a and b in such a way that f is continuous function on its domain. f(x)= { (√x+a)+1 if -a ≤x ≤ 0 2x^2+3 if 0 ≤ x ≤ 1 (x+b)^2+1 if x>1

*September 25, 2016*

**was not in class bio/ math**

Preparing a Solution: A. Calculate the amount of methylene blue chloride (MW = 319.8 g/mol) needed to make 50 ml of a 10 mM stock solution. (Show calculations below) B. If you wanted to then dilute the solution from Part A to a final concentration of 0.1mM (in 50 ml total ...

*September 20, 2016*

**math**

translate the following sentence into an equation: The product of 9 and four less than n is 27 is is 9(n-4)=27 or 9n-4 = 27

*September 13, 2016*

**Chemistry**

Do you think the copper and zinc underwent a physical change or a chemical change?

*September 7, 2016*

**Algebra 1**

you have $50 in your bank account and you deposit $20 per week. Write an equation for the total amount of money you have in your account after x weeks.

*September 7, 2016*

**Math**

CLIMATOLOGIST Each year a tree is alive,it adds a layer of growth,called a tree ring,between its core and its bark. A climatologist measures the width of tree rings of a particular tree for different years: YEAR: 1900:1910:1920:1930:1940 Width of ring:14/25:29/50:53/100:13/20:...

*September 6, 2016*

**Texas History**

Both answers is wrong it's C if you want to be correct just pick it it will be right becauseI chose D and it said it was wrong as well with A and B.

*August 26, 2016*

**English**

Revise the following sentence so that ACTIONS name KEY VERBS. 1. Our discussion was lively and fun

*August 25, 2016*

**Health**

Which of the answer is correct

*August 18, 2016*

**chemistry**

A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of octane is consumed by the reaction of 8.8g of oxygen gas? Round your answer to 2 significant digits.

*August 9, 2016*

**Math**

composite number: positive integer that isn't a prime number Less than 10 + greater than 6 + even: 8 - Factors: 1,2,4,8 -- composite Answer:8

*August 3, 2016*

**calc **

a parallelogram has an area of 150 cm^2. the side lengths are 80 cm and 40 cm what are the measures of the angles

*July 15, 2016*

**calculus **

A door is opened by pushing inward explain in terms of torque why this is most easily accomplished when pushing at right angles to the door as far as possible from the hinge side of the door?

*July 15, 2016*

**calc **

a wrench is rotated with torque of magnitude 175 N (M). the force is applied 45 cm from the pivot point at an angle of 48 degrees. what is the magnitude of the force, to one decimal place?

*July 15, 2016*

**calc**

Would k(a-b) x (a x c) -a +( b x c) be a scaler, vector or meaningless? (these are all vectors besides k)?

*July 15, 2016*

**Math**

Thank yoU!

*July 14, 2016*

**Math **

Mr.Adams had a coin collection including only nickels, dimes, and quarters He had twice as many dimes as nickels and half as many quarters as he had nickels. If the total face value of his collection was $300.00, how many quarters did the collection contain? A) 75 B) 100 C) ...

*July 14, 2016*

**Calc. **

Determine the value and value for each of the following: a) 2(3,y )-5(x,2)= (6,-4 )

*July 8, 2016*

**Calc. **

Find the angle between the vectors ⃗⃗u (-1,4,2 ) and ⃗v (-2,5,1 )

*July 8, 2016*

**Sciencr**

Why is a cool basement damp, in terms of humidity? I know that when you increase temperature and relative humidity decreases but I don't get how this fits? It's a closed environment so maybe there is condensation?

*July 2, 2016*

**algebra**

Yes it can be whatever you want between that given range. For example, if the slope was -0.2, (or -1/5) then, your line would go down from left to right (because it's negative) and move down 1 every time you move 5 to the right (m= rise/run) Hope that helps!

*June 13, 2016*

**Math**

Marie traveled to work (7km) in 25 minutes. What was her speed? I got 16.8km/h but my teacher said it's 28km/h and I have no idea how he got that. Also, how do you calculate average speed when there's more than one speed? (this is just for the next question)

*June 13, 2016*

**math**

First, I would put all the times to one unit. (I'm going to use minutes because I don't like working with decimals.) 1 hour: 60 minutes 1 day: 60 minutes times 24 (hours in a day) = 1440 minutes Now set up proportions: 150 people/1 minute = x people/60 minutes cross ...

*June 13, 2016*

**algebra**

a math exam is marked out of 120. draw a conversion graph to change the following marks to percentages. a_80 b_110 c_54 d_72

*June 6, 2016*

**algebra**

long-distance calls from New York to Harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same exes, conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost ...

*June 6, 2016*

**algebra**

long-distance calls from new york to harare are priced at 85 cents/min off peak and $1.20/min at peak times. a_ draw, on the same axes conversion graphs for the two different rates. b_ from your graph estimate the cost of an 8 minute call made off peak. c_ estimate the cost of...

*June 6, 2016*

**Calculus**

I should probably specify that I got the area by integrating y^(-1/2) - (-y^(-1/2)) with my calculator on the interval [1,3] Sorry!

*May 24, 2016*

**Calculus**

Find the area of the region bounded by the curves y = x^(-1/2), y = x^(–2), y = 1, and y = 3. a) (1/2)(3)^1/2 + (4/3) b) 2*(3)^1/2 - (8/3) c) (1/2)(3)^1/2 - (32/3) d) 2*(3)^1/2 - (32/3) e) (8/3) - 2*(3)^1/2 So one thing that is throwing me off on this question is that I ...

*May 24, 2016*

**trigonometry**

Verify that sec(θ)/csc(θ)-cot(θ) - sec(θ)/csc(θ)-cot(θ) = 2csc(θ) is an identity. can some help me through this? thank you!

*May 24, 2016*

**trigonometry**

25. simplify: sin^2 ø/1- cos ø please help? thank you!

*May 20, 2016*

**math**

i don't have any work to show you... i don't get it

*May 15, 2016*

**math**

You want to cover a trapezoidal box with paper. You have a sheet of paper that is 1m by 500cm. What is the size box that can be made with minimal wastage? plz plz plz help me with this.. i don't understand how to do this

*May 15, 2016*

**Algebra**

You want to cover a trapezoidal box with paper. You have a sheet of paper that is 1m by 500cm. What is the size box that can be made with minimal wastage?

*May 15, 2016*

**Maths**

the total answer will be 437 +248 6 8 5

*May 15, 2016*

**Maths**

437 +248 do the math...

*May 15, 2016*

**Maths**

okay, and does the 4 at the bottom go under 3 and the 8 go under 7?

*May 15, 2016*

**Maths**

Does the 2 go under 4 or 3?

*May 15, 2016*

**math**

9. solve |4x + 3| = 9 + 2x and check for extraneous solutions. the first answer I got was: |4x +3| = 9 + 2x |4x| = 6 + 2x 2x = 6 x = 3 can someone help me find the other answer? thank you!

*May 12, 2016*

**math**

8. The half-life of a certain radioactive material is 71 hours. An initial amount of the material has a mass of 722 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 17 hours. Round your answer to the ...

*May 11, 2016*

**math**

6. The half-life of a certain radioactive material is 32 days. An initial amount of the material has a mass of 361 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the ...

*May 11, 2016*

**Math **

A tank measures 30 can by 60cm by 50cm. What is the height of water in the tank when 60000 ml of water are poured into it?

*May 10, 2016*

**math**

O MY GOODNESS I UNDERSTAND NOW THANK YOU SO MUCH

*May 10, 2016*

**math**

14. Let f(x) = -2x - 7 and g(x) = -4x + 3. Find (f o g)(-5) A)23 B)-53 C)-9 D)3 please help!!

*May 10, 2016*

**math**

17. Let f(x) = x2 + 6 and g(x) = x+8/x . Find ( g o f)( -7) A)384/7 B)295/49 C)-57/7 D)63/55 could someone please help?

*May 10, 2016*