Wednesday

February 22, 2017
Total # Posts: 1,007

**Math - Calculus**

Directions (or bearings) on Earth are measured in degrees, running from zero to 360 degrees, clockwise, starting with 0 degrees being due North. So due East for example, is 90 degrees, due South 180 degrees, and Northwest is 315 degrees. You are swinging a rock clockwise (...

*February 21, 2017*

**Math**

The figure at right shows a long rectangular strip of paper, one corner of which has been folded over to meet the opposite edge, thereby creating a 30-degree angle. Given that the width of the strip is 12 inches, find the length of the crease.

*February 19, 2017*

**Math**

A magician showed a magic trick where he picked one card from a standard deck. Determine what the probability is that the card will be a red color queen card ?

*February 16, 2017*

**Stephens **

Each of the letters in the word CALCULATOR are on separate cards, face down on the table. If you pick a card at random, what is the probability that it's letter it's letter will be C or L?

*February 16, 2017*

**Math - Calc/Algebra/Trig**

I'm trying to find all the points on the graph y=4/3cos^3x-cosx where the tangent line is horizontal. I took the derivative, which gave me: -4cos^2(x)sin(x)+sin(x) Now I need to solve it for x and I'm not sure how. Can you help?

*February 16, 2017*

**Math - Calculus**

The horizontal velocity is constant. (Ignore air resistance.) Recall from your study of trigonometry that if you release a rock at a speed v in a direction that makes an angle ? with the horizontal, then the initial vertical velocity vv and the horizontal velocity vh are given...

*February 14, 2017*

**Math**

You drop a rock into a deep well. You can't see the bottom of the well but you can hear the impact after T seconds. Suppose the speed of sound is c feet per second and the depth of the falling rock at time t is gt^2/2 feet. Compute the depth d of the well. Your answer will...

*January 26, 2017*

**Chemistry**

How much energy, in calories, does it take to convert 20.0 grams of solid water, at 0.0 degrees C, into liquid water, at 0.0 degrees C? (The enthalpy of fusion for H2O is 1.44 kcal/mol)

*January 24, 2017*

**Math**

WebWork = 28% Four exams = 6% each A final = 28% Labwork = 20% Suppose you obtain 100 percent credit on all WeBWorK assignments for this class. What is the minimum average percentage on the exams and labwork that will still get you an A in this class? (Remember an A is greater...

*January 24, 2017*

**math**

Lexie is painting her fence. each foot of the fence requires 3/5 of a gallon of paint. Her fence is 8 3/4 feet long.what is the total amount of paint,in gallons Lexie needs to paint her fence?

*January 18, 2017*

**Algebra **

In , is a right angle. Find the remaining sides and angles. Round your answers to the nearest tenth. Show your work. a = 3, c = 19

*January 18, 2017*

**Math**

A trail mix contains peanuts, chocolate pieces, and raisins. There are twice as many raisins as chocolate pieces. There are 20 less peanuts than raisins. In total, the mix contains 200 trail mix pieces. Write an equation in terms of r (the number of raisins) to represent this ...

*January 5, 2017*

**Grammar**

They look OK.

*January 2, 2017*

**Calculus**

Please help me. 1. Use the definition of the derivative to find f'(x), if f(x)=x^-2 2.Find the derivative of y=3t^5 - 5?t + 7/t

*December 18, 2016*

**Math**

8×5+8×1-2×6+6-2 add parentheses to get 22

*December 8, 2016*

**Physics**

Not sure where to begin with this question--any help appreciated! Two kids sitting on opposite sides of a small lake use sticks to beat the surface of the water at a frequency f=1.5 Hz. They notice that a standing wave pattern develops between the points where they are ...

*December 8, 2016*

**math**

Find an equation of the line having the given slope and containing the given point. m equals negative 7?, ?(5 ?,9?)

*December 7, 2016*

**Physics**

Not at all sure where to start with this problem. Any help would be appreciated! The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s...

*December 3, 2016*

**Physics**

A pan flute is based on standing wave resonance in a tube that is open where the musician blows and closed at the bottom end with bee’s wax. (a) Describe the standing wave pattern of air displacement in such a tube when a tone is played. (b) Determine the length of the ...

*December 3, 2016*

**Physics**

Two kids sitting on opposite sides of a small lake use sticks to beat the surface of the water at a frequency f=1.5 Hz. They notice that a standing wave pattern develops between the points where they are disturbing the water surface. They count n=5 nodes over the L=10 m ...

*December 3, 2016*

**Physics**

The siren of an ambulance has a frequency f=500 Hz. A pedestrian standing on a sidewalk listens to this siren as the ambulance passes by at a speed of 65 mph. The speed of sound in air is 330 m/s. a) Calculate the total shift in frequency detected by the pedestrian as the ...

*December 3, 2016*

**Physics**

Poiseuille’s equation relates the volumetric flow rate Q (volume per time unit) to the pressure differential ?P that drives the flow: Q = (?r^4)/(8?) x (?P/L) Here ? is the viscosity of the fluid and the tube has length L and radius r. A fire brigade needs to triple its ...

*December 3, 2016*

**Physics**

Any help appreciated! Pull out a blank piece of paper from your exam book. Hold it from one of its ends and blow air horizontally over the top of the paper as shown in the figure below. If you blow hard enough you will see the paper rise to become almost horizontal. (a) ...

*December 3, 2016*

**Calculus**

Nevermind, I figured it out V=?[0,3]2pix(45-x^2-4x^2)dx

*December 2, 2016*

**Calculus**

Find the volume of the solid generated by revolving the region in the first quadrant that is above the parabola y= 4x^2 and below the parabola y= 45-x^2 about the y-axis I just need help setting up the integral. V=?[0,3]2pix(45-x^2)dx What am I doing wrong?

*December 2, 2016*

**Calculus**

Find the area of the region enclosed between y=4sin(x) and y=2cos(x) from x=0 to x=0.7pi. Hint: Notice that this region consists of two parts.

*December 2, 2016*

**Physics**

Please help! Any advice is appreciated A water faucet in a house is h=8 m below the water surface in the local water tower. The radius of the orifice in the fully opened faucet is r=0.01 m. We assume non-viscous flow in this problem. a) How long does it take to fill a 20 liter...

*November 30, 2016*

**Physics- Fluids**

Please help! Any advice is appreciated A water faucet in a house is h=8 m below the water surface in the local water tower. The radius of the orifice in the fully opened faucet is r=0.01 m. We assume non-viscous flow in this problem. a) How long does it take to fill a 20 liter...

*November 30, 2016*

**Physics**

Any help is appreciated! A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps perfect time on the first floor of the Sears tower but when carefully moved to the top floor h=436 m above the surface of the earth, the clock is found to be slow...

*November 30, 2016*

**Physics**

Not sure where to go with this problem, any help is appreciated! A bike is turned upside down for repairs. The front wheel can be described as a hoop with radius R=0.6 m and mass M=1.0 kg and a small point mass m=0.005 kg attached to the perimeter to represent the valve for ...

*November 29, 2016*

**Physics**

Not sure where to go with this problem, any help is appreciated! A bike is turned upside down for repairs. The front wheel can be described as a hoop with radius R=0.6 m and mass M=1.0 kg and a small point mass m=0.005 kg attached to the perimeter to represent the valve for ...

*November 29, 2016*

**Physics**

Could someone please help walk me through this problem I'm struggling with? Thanks in advance! A brick with mass m1=2.5 kg can move without friction on a horizontal plane. The brick is attached to a wall by an ideal spring with spring constant k=2300 N/m. A second brick ...

*November 29, 2016*

**Chemistry**

What is the molarity of the final solution of 2.00mL of the 5.00M stock solution is diluted to 10.00mL to make solution A. Solution A undergoes a second dilution by taking 3.00mL solution A and diluting it to 25mL? I'm so confused by this. Please help.

*November 10, 2016*

**geometry**

I need help with my math.. Can someone please help.. In the coordinate plane point X lies on line segment MN. The coordinates for MN are (-1,3) and (7,10). If the ratio of the length of MX to the length of XN is 2:5, what is the y-coordinate of point X?

*November 8, 2016*

**Calculus - Special sum formulas**

Find the formula of n ? (j+3)(j-4) j=1 I have gotten to n(n+1)(2n+1)/6 - n(n+1)/2 - 12n How do I simplify it from there?

*November 4, 2016*

**Calculus - Falling Body Problem**

Near the surface of the earth, the acceleration of a falling body due to gravity is 32 feet per second per second, provided that air resistance is neglected. If an object is thrown upward from and initial height of 3000 feet with a velocity of 75 feet per second, find its ...

*November 4, 2016*

**college chemistry**

Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 75 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to ...

*November 1, 2016*

**Chemistry**

Wait, could you please explain a little more in depth please? I got lost after you started with the Extra Strength. The generic brand I'm using has 500 mg of active ingredient (CaCO3). Also, can you explain why you took half the number of moles of CaCO3??

*November 1, 2016*

**Chemistry**

Stomach acid is composed primarily of HCl. If the concentration of the acid is 0.010M and it has a volume of 70 mL, how many generic tablets would you need to fully neutralize the acid? (Use your data) I just don't know where to start for this question, or the steps to ...

*November 1, 2016*

**Science**

Yes, the answer is D (I just took this quiz and got it right).

*October 31, 2016*

**English**

"The Lottery" (1948) by Shirley Jackson ** this website won't allow for links; therefore, I couldn't put the link of this story** (the short story is online for reference) The question that needs to be answered is: EXPLAIN the source of horror in Jackson’...

*October 20, 2016*

**math**

6x6x3-6=108

*October 14, 2016*

**Math - Calculus 1**

Approximate the following value using derivatives (without a calculator) (1.1)^4 - (1.1)^2 I only know how to do linear approximation when using square roots. How do I do this type of problem?

*October 7, 2016*

**Math**

Use the order of operations to find the value of the expression. 6 x 5 + 3 x 8 Please help.

*September 20, 2016*

**Math**

I need to make a crossword puzzle using scientific notation and standard form

*September 19, 2016*

**Trigonometry**

How do I solve these linear system problems? I solved it many times but it never seems right. 1. x^2 + y^2 =9 2x - y = -6 2.x^2 - x -y =0 x - y = -3 3. 2x^2 - x - y = -1 3x + y = 5

*September 17, 2016*

**geomety please help**

the perimeter of a recatngle is 54 inches. The width is one inch less than the lenght. FInd the length and width. I just don't understand how to find the length and width if i am only givent eh perimeter please show work thank you

*September 14, 2016*

**algebra**

A store prices tapes by raising the wholesale price 40% and adding 25 cents. What must a tape's wholesale price be if the tape sells for $1.99?

*September 13, 2016*

**Algebra**

For three consecutive odd integers, the sum of 3 times the first integer and 2 times the second integer is 11 less than 4 times the third integer. What are the three integers? Separate your answers with commas. Ex: 1,2,3

*September 13, 2016*

**Biology**

What is the sample size in this experiment? How can you tell what the sample size is in this case? A team of researchers observed that the acorn density of the oak forests in New York fluctuates from year to year and that mice populations in the forest were increased when the ...

*August 30, 2016*

**Math - Check please!**

I. -28/4 -7 *** 7 - 1/7 1/7 II. Which equation represents “fifteen more than r is sixty-one”? r + 61 = 15 r + 15 = 61 *** r – 15 = 61 r – 61 = 15 III. What is the value of 4^2 – 2(3 x 5 + 1)? 8 1 -16 *** -21 IV. What symbol is needed between -2 and |-3...

*August 29, 2016*

**Chemistry**

A salt water swimming pool is 47.0 m long, 25.1m wide, and 2.79 m deep. If the pool is filled with salt water having a density of 1.06 g/ cm3, how many pounds of salt water are in the pool when it is filled? 1 kg = 2.20 lb I'm not sure how to approach this. I've tried ...

*August 29, 2016*

**Math**

A square, where s is an odd integer, is divided into unit squares. All the unit squares along the edges and the 2 diagonals of a square are discarded. Find a fully simplified expression, in terms of s, for the number of unit squares remaining answer.

*August 15, 2016*

**probability statistics**

how many bridge hands are possible containing 4 spaders, 6 diamonds , 1 club and 2 heart?

*August 13, 2016*

**none**

the length of a rectangle is 32 ft. the width is 18 ft. what is the diagonal length

*July 31, 2016*

**Math**

A square, where s is an odd integer, is divided into unit squares. All the unit squares along the edges and the 2 diagonals of a square are discarded. Find a fully simplified expression, in terms of s, for the number of unit squares remaining answer.

*July 5, 2016*

**Physics/Mechanics**

the only thing i'm missing is the correct force used for both inclined planes as well as show my working out for getting the force

*July 5, 2016*

**Physics/Mechanics**

I've already calculated the distance, distance for 10 degrees is 17.28 and distance for 40 degrees is 4.68

*July 5, 2016*

**Physics/Mechanics**

Two part Question: A load of 1500N is to be at Height of 3m above the ground. The available Incline planes are 10 degrees and 40 Degrees to the horizontal. Find out the Work Done by effort on the 10 degrees and 40 Degrees ramps. Assume the coefficient of friction is 0.8. Which...

*July 5, 2016*

**English**

What principal idea about people does the story "Harrison Bergeron" convey? (Points : 5) Great art belongs to the few who can create it. Only a few people have the talent to become professional artists. The goal of equal rights for all should not erase the varying ...

*June 1, 2016*

**English**

Uplifting ?

*June 1, 2016*

**English**

The patriotism of the speaker in Rupert Brooke's "The Soldier" gives a poem about dying in battle a(n)__________ tone. Depressing ~~I feel it's this one Uplifting Angry Silly

*June 1, 2016*

**English**

Which phrase best describes the word choice & voice of "Theme for English B"? Dull & old-fashioned ~~I think it's this one Formal & fancy Wordy & vague Clear & candid

*May 31, 2016*

**math**

okay thanks

*May 25, 2016*

**math**

3. 100% - 33% = 67% a = 0.67 * 134 = 89.78?

*May 25, 2016*

**math**

1. $78.20 2. ? 3. $200 4. $37.12

*May 25, 2016*

**math**

1. Original price: $92 Discount: 15% What is the sale price? 2. Original price: $110 Sale price: $91.30 What is the discount? 3. Discount: 33% Sale price: $134.00 What is the original price? 4. Cost to store: $32 Markup: 16% What is the selling price?

*May 25, 2016*

**Math**

IT takes Holly 5 hours to type a paper. It takes Mike 6 hours to type the same paper. HOw long would it take them working together? Just average?

*May 18, 2016*

**life orientation**

ways on how the geographical distribution of media can be improved

*May 18, 2016*

**trigonometry**

given that θ=5/9 and pi/2<θ< pi, find the values of the other 5 trigonometric functions of θ

*April 27, 2016*

**Math**

Write a real world situation that can be represented by the expression 8(t - 3). Tell what the variable represents then give a value for t and evaluate the expression.

*April 25, 2016*

**Statistics**

I'm totally blanking on how to do this type of problem and I want to use the statistic for an essay. I want to say that females are ___% more likely to be cyberbullied than males. Here is the data I have... Females: 41% reported being bullied Males: 32% reported being ...

*April 25, 2016*

**Math**

Varlos found that 1/2 of the apples in one basket are Granny Smith apples and 1/6 of the apples in another basket are Granny Smith apples. Which statement correctly compared the feactions?

*April 21, 2016*

**physics!**

In its search for flying insects, a bat uses an echolocating system based on pulses of high frequency sound. These pulses are 2.0 ms in duration, have a frequency of 50 kHz, and an intensity level of 100 dB at 1.0 m from the bat’s mouth. Assume the bat produces acoustic ...

*April 16, 2016*

**IMPORTIANT MATH**

A school is fencing in a rectangular area for a playground. It plans to enclose the playground using fencing on three sides (the fourth is a wall) . The school has budgeted enough money for 75 ft of fencing material and would like to make a playground with an area of 600 ft^2...

*April 12, 2016*

**Bio**

What is being asked of me, the question reads: Extrapolate single trait genetic flow to human disorders and diseases.

*April 7, 2016*

**Bio**

How to I determine the sequence of amino acid assembled when given the following +DNA code: CCA, AGT ? I'm asked to give the :-DNA, mRNA, tRNA codes, and also the amino acid. If I'm not mistaken I know that I must replace "T" thymine for "U" uracil...

*April 7, 2016*

**Bio**

How does a change in one nucleotide in one triplet code can change the nature of a protein and therefore the form of the trait ? I believe this has something to do with mutations. I know that mutation may result from errors in DNA replication or recombination, or physical or ...

*April 7, 2016*

**Bio.**

How does the genetic code is transferred from the nucleus to the cytoplasm to the amino acids ? Does it have something to do with transferring DNA-RN A ?

*April 7, 2016*

**chemistry**

to complex ( K2[Cu(C2O4)2]H2O, add 1 com of dil. H2SO4. Add KI; then add 1-2cm3 choloform and shake gently. what are the observations.

*April 3, 2016*

**HISTORY**

Which answer best describes why women were active in early reform movements? A. Many Americans believed women had higher morals than men. B. Many Americans believed women could better bring about change than men. C. Women in the 19th century had plenty of extra time to ...

*March 29, 2016*

**us history**

B? Because the declaration of sentiments was signed in 1848.

*March 29, 2016*

**Chemistry**

Calculate the empirical formula of Tylenol: C, 63.56%; H, 6.00%; N, 9.27%; O, 21.17%

*March 26, 2016*

**Physics**

If the sky diver releases her chute and an upward force of 800 Newtons is developed due to wind resistance, what will be the net force acting on her?

*March 5, 2016*

**physics**

A 5 kg block is being held against the wall. What is the minimum force needed to keep the block from moving if the force is applied at an angle that is 15 degrees above the horizontal. The coefficient of static friction between the wall and the block is 0.275.

*February 29, 2016*

**URGENT NEED HELP ASAP**

If you were a muckraker, would you want to expose, uncover, or examine the issue? Do you feel that issue still exists today, perhaps in a different form?

*February 16, 2016*

**English**

In "The Wager, by: Anton Chekhov" the climax comes when the jurist who is confined, begins to ask for musical instruments and tobacco. True or False

*February 1, 2016*

**English & Composition**

Here is my topic sentence for ALLUSION

*January 23, 2016*

**English & Composition**

Nevermind forget that. Those were just ideas to get me thinking but I just confused myself even more. So heres is the thesis : A. Thesis: To convince Virginia delegates to vote for revolution, Patrick Henry develops a passionate attitude through his rhetorical questions, ...

*January 23, 2016*

**English & Composition**

I need help with writing a topic sentence that briefly but accurately takes into context the quote below. This is a long quote so its difficult to make a topic sentence that deems appropriate in the sense of Allusion D. Topic Sentence Three (Allusion) : Primary Evidence (...

*January 23, 2016*

**Chemistry**

100 mL 0.1 M sodium acetate solution is mixed with 50 mL 0.1 M acetic acid. If now 0.937 mL of 1 M sodium hydroxide is added to the buffer what is the change in pH? pKa (acetic acid) = 4.76

*January 9, 2016*

**Physics**

speed is a scalar and has no direction. Acceleration is a vector and direction matters so if an object is changing direction, it's acceleration changes independently of speed. So I would say yes it is possible for it to increase in speed as acceleration decreases

*January 6, 2016*

**math**

My guess is that when you say a mixed fraction e.g. 1 1/7, you literally say '1 and one seventh' so the & effectively means +

*January 6, 2016*

**math**

1 + 1/7 = 7/7 + 1/7 = 8/7

*January 6, 2016*

**Math**

Convert the whole number into a fraction with the same denomenator

*January 6, 2016*

**ALGEBRA**

Move every term with m in it onto one side, and the constants on the other. Divide the constant by the coefficient of m to get m. 9/2m - 4m = -3.5 + 6 2.5/0.5=5 M=5

*January 6, 2016*

**Math**

Right so 1/3 of his income goes on personal affairs leaving 2/3 left. He uses half of this (1/3) on household which leaves 1/3 left. He then invests 75% of the remaining 1/3 leaving 25% of that 1/3 in his hand. (1/3) x 0.25 = 0.083. So 8.33% of his initial salary equals the ...

*January 6, 2016*

**Math**

Answer is £12,000

*January 6, 2016*

**Biology**

The street lights in many cities contain bulbs with sodium vapor. When electrical energy is pass through the bulb, a brilliant yellow light is given off. What is happening to the sodium atoms to cause this? Explain. How would magnesium and chlorine interact? Please help. Thank...

*January 5, 2016*

**physics**

DAMON please help.Thankyou

*December 20, 2015*