# Posts by Craig

Total # Posts: 104

**Calculus (related rates)**

A ladder 13 meters long rests on horizontal ground and leans against a vertical wall. The foot of the ladder is pulled away from the wall at the rate of 0.4 m/sec. How fast is the top sliding down the wall when the foot of the ladder is 5 m from the wall?

*March 21, 2017*

**Calculus (related rates)**

Find dy/dt where y = 2 sqrt(x)-4 and dx/dt = 9 when x = 4.

*March 21, 2017*

**Calculus (related rates)**

FORMAT WRONG ABOVE.... Correct one is.. Find dy/dt when y = 2x^2 + 2x + 4 and dx/dt = 14 when x = 7.

*March 21, 2017*

**Calculus (related rates)**

Find dy/dt when y = 2x2 + 2x + 4 and dx/dt = 14 when x = 7.

*March 21, 2017*

**Math**

I think its $990 after Cellularphoniqua takes 10%

*October 6, 2016*

**Math**

If Tyrone tips Sharqueffa $500 and Daquan tips Watermelondrea $600, how much did the trap house earn that night if Cellularphoniqua (the owner) takes 10% of all tips. Please help

*October 6, 2016*

**physics**

an arrow is shot vertically upward after 2s it is at a height of 36m although this is not necessarily the highest point with what velocity was the arrow shot what is the maximum height reached by the arrow how long is the arrow in flight altogether

*July 26, 2016*

**physics**

the takeoff speed for a large airplane is 180 mi/hr(roughly 80m/s0 the plane is capable of accelerating at a rate of 4m/s^2 assume that the plane starts at rest determine the minimum runway length required for this plane to safely take off a smaller airplane requires a takeoff...

*July 26, 2016*

**maths**

marcus has a box of chocolates. he eats 1/5 of them. his sister eats 1/3 of the chocolates that are left. there is 24 chocolates left in the box. how many where in the box to start with.

*July 1, 2016*

**Math**

the current population of a city is 45000 and is increasing according to P=45000(1+t)^n and n=number of years. if the rate of increase is 7.5% how long will it take the population to double?

*April 25, 2016*

**Chemistry**

Anyone please?

*April 6, 2016*

**Chemistry**

Complete the following equilibrium reactions that are pertinent to an aqueous solution of Ag2CO3. Physical states, s, l, g, and aq, are optional. So far I worked it out to be: Ag2CO3(s) <--> 2Ag^+ + CO3^(2-) H2CO3(aq) + H2O(l) <--> H3O^(1+) + (HCO3)^(-) HCO3^(-)(aq...

*April 6, 2016*

**BIOLOGY - HELP URGENT!!!!**

How do the following terms relate to one another with respect to a single genetic locus? - Wild Type Allele(s) - Mutant Allele(s) - Gene Product(s) - Population - Genotype - Phenotype - Dominant Allele - Recessive Allele - Individual - Number of different alleles

*February 28, 2016*

**Math**

I figured it out. 40 acres = 1320' x 1320'; P=2L + 2W; P=2(1320)+ 2(1320); P=5,280', which is a mile. Run the wire 3x, and it equals 3 miles.

*February 25, 2016*

**Math**

I figured it out. 120-100=20, which is the net difference. Divide net difference by the new cost of 120, which equals 16.67 less.

*February 25, 2016*

**Math**

I can't calculate the correct answer.

*February 25, 2016*

**Math**

Thank you for the response. That was the answer that I initially calculated using percentage change; however, the answer is that it was lowered by 16 2/3%. The explanation is that it now takes $6 to buy what used to cost $5. Each dollar is worth 1/6 less.

*February 25, 2016*

**Math**

The cost-of-living index increased from 100 to 120. What effect does this have on the purchasing power of the dollar?

*February 25, 2016*

**Math**

a 5 foot fence will be built around the perimeter of a 50 foot by 120 foot rectangular lot. if the fence costs $1.80 per linear foot for labor and $.40 per square foot for material, what will be the cost of the fence?

*February 24, 2016*

**statistics**

The average cost per night of a hotel room in New York City is $272 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.

*December 9, 2015*

**Algebra 2**

Show two steps to simplify each of the following expressions, and then calculate the value of each expression. 25 exponent 5/2 81 exponent 7/4

*November 3, 2015*

**OJTC**

if a car was traveling 60 miles an hour and hit and in movable wall instantaneously stopping how many gravities of force would be involved

*October 22, 2015*

**Geometry**

How do you figure the height of a tripod using 28' legs set 7' out from center?

*May 18, 2015*

**English**

In "Mowgli's Brothers," before he leaves the jungle, Mowgli says, "For the rest, Akela goes free to live as he pleases. Ye will not kill him." What does this show about Mowgli?

*January 17, 2015*

**Math**

What is the equation 745✖876

*October 29, 2014*

**algebra**

Question: 89 of 111 Leave Questionnaire You need to hire a part-time associate to work 30 hours a week in your store. You have $250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid $9.00...

*June 4, 2014*

**Chemistry**

Methane reacts with water to form CO and H2 as follows: CH4(g)+H2O(g)=CO9g)+3H2(g) The value of Kp at 298 k for the reaction is 7.7 *10^24, calculate Kc. If you can please show the steps I would greatly appreciate it. Thank you

*December 10, 2013*

**Math- urgent**

8x-8-6x=20 2x=28 x=14

*December 10, 2013*

**college math**

How many different committees can be formed from 9 teachers and 39 students if the committee consists of 2 teachers and 3 students? In how many ways can the committee of 5 members be selected?

*March 24, 2013*

**math**

2x^4-11x^3-6x^2+64x+32=0

*February 21, 2013*

**physics**

How much friction force will be required if a car weighing 2100kg traveling at 28m/s rounds a curve of radius 59m banked at a 15 degree angle

*September 25, 2012*

**physics**

in the equation V=sqrt(r*g), what does sqrt stand for?

*September 25, 2012*

**Math**

3x-2y=0 x-y=-1

*July 12, 2012*

**chemistry lab**

Oh that's what it is? Thanks

*July 9, 2012*

**chemistry lab**

How does the presence of a common ion affect the solubility of a salt? Explain in terms of equilibrium.

*July 9, 2012*

**Statistics**

What spinner?

*July 8, 2012*

**chemistry**

thank great help! much appreciated

*July 8, 2012*

**chemistry**

Strong base is dissolved in 665 mL of 0.400 M weak acid (Ka = 3.69 × 10-5) to make a buffer with a pH of 3.94. Assume that the volume remains constant when the base is added. HA(aq) + OH-(aq) -> H2O(l) + A-(aq) Calculate the pKa value of the acid and determine the ...

*July 8, 2012*

**math**

which to end unit is the best choice for measuring the pyramid of a picture on the wall

*March 5, 2012*

**geometry**

a right triangle find the value with 71 5 find x n y answers

*January 26, 2012*

**Geography**

What political changes swept through Europe during the second half of the twentieth century?

*January 9, 2012*

**MATH**

the perimter of a rectangle is 20inches and its area is 16 square inches. Find the dimensions of the rectangle. I need help to set up the problem

*January 5, 2012*

**ENGLISH**

ok fine ,but thanks for the help

*January 5, 2012*

**ENGLISH**

He is right if romeo and juliet get married and the families might come together. The Friar does consent to marry Romeo and Juliet, hoping that the marriage might bring peace between the feuding families. Is this right so far.

*January 5, 2012*

**Social Studies**

Improve Not all early Americans were happy with the Constitution. Democratic-Republicans, also known as Anti-Federalists, opposed the Constitution because they feared the Federal Government would gain too much power... much like King George from whom they had just fled! They ...

*January 4, 2012*

**ALGEBRA 1**

The square of a number is equal to the sum of 21 and 4 times the number. Find the number

*January 4, 2012*

**ALGEBRA 1**

The height h is the time of seconds that the ball has been in the air with an initial vertical velocity of 48 feet per second from a height of 5 feet above the ground is given by the equation h=-16t^2 + 48t + 5 where t is the time in seconds that the ball has been in the air. ...

*January 3, 2012*

**math**

Im having a problem understanding this problem so I cant solve it. Bruce knows how many key are on his keyboard, but some don't work. How does Bruce find the number of keys that work? write to explain

*December 7, 2011*

**Biology**

Why does Beta Glucose chains have more weak bonds between the chains than there are between alpha glucose chains?

*October 9, 2011*

**math**

a rectangular pen is to be constructed alongside a barn using 120 feet of fencing. the barn will be used for one side of the pen. What should the dimensions of the pen be to maximize its area. ***Can not use calculus. This is a 9th grade question

*September 28, 2011*

**algebra**

Use the given conditions to write an equation for the line in point'slope form and slope-intercept form. Slope= -5, passing through (-9,-6) type the point-slope form ot the line Type the slope-intercept form of the line

*June 6, 2011*

**Managerial Accounting**

what management position is responsible for each variance: Sales Materials Labor Overhead General, Selling & Administrative What causes these variances?

*April 5, 2011*

**Chemistry**

A solution is prepared by dissolving 130 g of NaNO3 in 100 g of water at 80°C. The solution is cooled to 0°C. How many grams of compound remain in solution? How may grams of solid are formed?

*April 3, 2011*

**math**

What is 58 rounded to the greatest place value?

*February 3, 2011*

**Math**

The number is between 3 and 10, you can make exactly 3 arrays with this number and it's not 9. What is it?

*December 5, 2010*

**Math (Calc 1)**

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle (as shown in the figure below). (pictures of a pentagon) If the cross-sectional area is A, determine the dimensions of the ...

*November 20, 2010*

**Biotechnology**

How would you make 450 mL of a 0.250 M NaOH solution?

*November 13, 2010*

**chemistry**

stop cheating

*November 1, 2010*

**English**

I believe in this sentence: It was the world’s first movie studio. the subject is: movie studio the predicate is: was Am I correct?

*September 29, 2010*

**English**

Thank you!

*September 29, 2010*

**English**

were?

*September 29, 2010*

**English**

The first movies were different from today’s films. What is the simple predicate

*September 29, 2010*

**math**

n=1/a-1/b solve for b please show all steps

*September 16, 2010*

**maths.**

the smallest number is 2

*September 11, 2010*

**maths.**

find the lcd of each setof fractions: 1/2, 1/8, 1/16

*September 11, 2010*

**Math**

If I bought an item for $80 on which there was a 30% markup, what is the formula to determine the pre-markup price?

*July 12, 2010*

**economics**

The smaller of the two factories will begin to see diminishing returns first. That is because they will have exhausted the capacity of the fixed factor of production(i.e. the factory) sooner. In other words, production will reach its maximum level because the factory only has ...

*July 12, 2010*

**Marketing**

A manufacturer of AC units realizes a cost of $55.00 for every unit produced. Its total fixed cost is $2,000,000. If the manufacturer produces 500,000 units, calculate its: a. unit cost b. markup price if it desires a 10% returns on sales c. ROI price if it desires a 25% ...

*July 12, 2010*

**Alge.**

Graph the equation using the slope and the y-intercept. y=5/3x+2 I need to show the slope and y-intercept when I graph.

*May 26, 2010*

**math**

what is the unit rate for 250 miles in 5 hours

*May 11, 2010*

**algebra**

A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 120 ft. of fence? What should the dimensions of the garden be to give the farmer the max area? Can not use calculus

*March 27, 2010*

**Math**

Is there a difference between solving a system of equations by the algebraic method and the graphical method? Why or why not?

*March 10, 2010*

**french**

i have a pc with windows is the rest it of it ok though

*March 7, 2010*

**french**

can someone check my french essay on pocket money and improve where possible very much appreciated Je recois dix livres d'argent de poche par semaine de mes parents. Pour gagner mon argent de poche je dois aider mes parents a la maison et je dirais que j'aide un peu a ...

*March 7, 2010*

**science**

a snowball rolls off the edge of a horizontal roof at a velocity of 7 m/s. what is the speed of the snowball 3 s later?

*November 3, 2009*

**physics**

what is the angular speed of Earth around the Sun in radians per second

*October 9, 2009*

**law**

according to beccaria, the system can reduce the severity of punishment and it can also do what?

*September 10, 2009*

**Math Statistics**

thank you so much! i think i got it!

*June 6, 2009*

**Math Statistics**

would this be a binomial-like should i consider it applicable for study not applicable for study

*June 6, 2009*

**Math Statistics**

An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...

*June 6, 2009*

**Statistics**

An investigational drug study is being conducted. The initial screening phase needs to include enough people so that the final (approved) group has at least 10 patients. The probability of a person being approved for the study is .80. what initial sample size is needed to make...

*June 6, 2009*

**10 rhyming words**

Hey, here's over ten: rail, crale, pale, stale, ale, tail, tale, nail, mail, wale, hail, fail, sail, yale, jail, gal

*April 28, 2009*

**Math**

Matt has twice as many stickers as David. If David has d stickers, and Matt gives David 10 stickers, how many stickers does each have in terms of d?

*February 20, 2009*

**Algebra**

I'm trying to solve this equation for x. .6 = x / x + 20 I can tell that X=30, but how do I prove that mathematically? We can't just plug in numbers, we have to show where we got them from.

*February 16, 2009*

**trigonometry**

show that 1-cos^2t divided by sin^2t =TANt

*January 30, 2009*

**trigonometry**

1) show that: 1-cos2t divided by sin2t= TANt 2) show that: 1-(cos2t divided by (cos x cos)t)= (TAN x TAN)t

*January 28, 2009*

**Calculus**

i'm guessing that twice differentiable means y''

*November 25, 2008*

**please help!!!**

i really don't know how to start this problem

*November 25, 2008*

**Calculus**

sorry about that: when t=0, r't=5.7; t=2, r't=4; t=5, r't=2; t=7, r't=1.2; t=11, r't=.6; t=12, r't=.5

*November 25, 2008*

**Calculus**

t: 0 2 5 7 11 12 r'(t): 5.7 4.0 2.0 1.2 0.6 0.5 The volume of a spherical hot air balloon expands as the air inside the balloon is heated. The radius of the balloon in feet is modeled by a twice-differentiable function of r of time t, where t is measured in minutes. For 0&...

*November 25, 2008*

**precalculus**

1. .015*65*12+65=76.7 million 2. 4*65=260 million

*November 25, 2008*

**Need help fast on calc**

original curve: 2y^3+6(x^2)y-12x^2+6y=1 dy/dx=(4x-2xy)/(x^2+y^2+1) a) write an equation of each horizontal tangent line to the curve b) the line through the origin with the slope .1 is tangent to the curve at P. Find x and y of point P. -when plugging y as 2 in original, it ...

*November 12, 2008*

**Math**

How do you do a factor tree for 37?

*October 30, 2008*

**8th grade**

EACH STATEMENT DESCRIBES TWO WORDS THAT WHEN FUSED TOGETHER CREATE A NEW UNRELATED WORD. QUESTION: THIS IS AN ALLOTMENT OF DNA

*September 18, 2008*

**12 math**

c)3! x 6! The three must remain together but can be in any permutation with the rest. It would be 5! ways if the three books had to be in a certain position.

*August 29, 2008*

**math**

Factoring. 6n^2 +24n -18 Answer: 6(n^2 +4n -3) y^3 -y^2 + 3y -3 Answer: (y-1)(y^2 +3)

*August 21, 2008*

**Algebra 1**

The upward velocity of the water in the stream of a particular fountain is given by the formula v = -32t + 28, where t is the number of secondds after the water leaves the fountain. While going upward, the water slows down until, at the top of the stream, the water has a ...

*October 11, 2007*

**IT**

high level languages need to be translated. what are two different types of translator? Thank you for using the Jiskha Homework Help Forum. By your question do you mean human vs. mechanical (machine or computer-assisted) translation?

*February 22, 2007*