# 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?

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

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.

Calculus (related rates)
Find dy/dt when y = 2x2 + 2x + 4 and dx/dt = 14 when x = 7.

Math
I think its \$990 after Cellularphoniqua takes 10%

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

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

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...

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.

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?

Chemistry

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...

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

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.

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.

Math
I can't calculate the correct answer.

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.

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

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?

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.

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

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

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

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?

Math
What is the equation 745✖876

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...

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

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

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?

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

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

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

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

chemistry lab
Oh that's what it is? Thanks

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

Statistics
What spinner?

chemistry
thank great help! much appreciated

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 ...

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

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

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

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

ENGLISH
ok fine ,but thanks for the help

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.

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 ...

ALGEBRA 1
The square of a number is equal to the sum of 21 and 4 times the number. Find the number

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. ...

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

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

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

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

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

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?

math
What is 58 rounded to the greatest place value?

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?

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 ...

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

chemistry
stop cheating

English
It

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?

English
Thank you!

English
were?

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

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

maths.
the smallest number is 2

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

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?

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 ...

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% ...

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.

math
what is the unit rate for 250 miles in 5 hours

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

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

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

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 ...

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?

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

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

Math Statistics
thank you so much! i think i got it!

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

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...

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...

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

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?

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.

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

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

Calculus
i'm guessing that twice differentiable means y''

i really don't know how to start this problem

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

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&...

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

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 ...

Math
How do you do a factor tree for 37?

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

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.

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

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 ...

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?

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