Tuesday
September 2, 2014

Posts by Eric


Total # Posts: 644

algebra 2
Let x = hourly wage 40x + 5(1.5x) = 475 40x + 7.5x = 475 47.5x = 475 x = $10/hour
August 24, 2014

Calculus
What is the derivative of 3sin(4x)? I have no idea where to begin!!!
August 24, 2014

algebra
(angle 1) + (angle 2) + (angle 3) = 180 Let's make an angle Q = (angle 1) + (angle 2). SO... Q + (angle 3) = 180 AND (angle 3) = Q - 45. SO... Q + (Q - 45) = 180 2Q = 225 Q = 112.5 Going back to the equation Q + (angle 3) = 180 or by rearranging it: (angle 3) = 180 - Q, if...
August 24, 2014

Algebra
thanks for the help!
August 22, 2014

Algebra
Given that xy = 3/2 and both x and y are nonnegative real numbers, find the minimum value of 10x + 3y/5
August 22, 2014

statistics
a rocket club makes its own rockets. The rockets go to a mean height of 1100 feet with a standard deviation of 60 feet. if the club fires 36 rockets, what is probability that the mean heights of the rockets will be greater than 1080p feet
July 13, 2014

Math - Algebra2
Also, you can tell that the first one is DIVERGENT because the numbers are diverging from one another! In other words, they are getting farther and farther apart The second one is CONVERGENT because all the numbers are converging to a certain number...in this case they are all...
May 16, 2014

Math - Algebra2
state whether the series is convergent or divergent 1) 3 + 12 + 48 + ... 2) 4 + 4/5 + 4/25 + ...
May 16, 2014

accounting II
i am completely stuck on this! 5. Manufacturing statements and cost behavior Tampa Foundry began operations during the current year, manufacturing various products for industrial use. One such product is light-gauge aluminum, which the company sells for $36 per roll. Cost ...
April 30, 2014

accounting II
oh, my apologies
April 28, 2014

accounting II
3. Definitions of manufacturing concepts Interstate Manufacturing produces brass fasteners and incurred the following costs for the year just ended: Materials and supplies used Brass $75,000 Repair parts 16,000 Machine lubricants 9,000 Wages and salaries Machine operators 128,...
April 28, 2014

accounting
i need help working through this! i am stuck. 3. Definitions of manufacturing concepts Interstate Manufacturing produces brass fasteners and incurred the following costs for the year just ended: Materials and supplies used Brass $75,000 Repair parts 16,000 Machine lubricants 9...
April 28, 2014

Chemistry
so then you would take 1.48 M times 42mL, then take that number and divide by .49 M, then convert to mL?
April 20, 2014

Chemistry
How many mL of 0.49 M HCl will neutralize 42 mL of 1.48 M NaOH?
April 20, 2014

Cultural Anthropology
how are traditional anthropological fieldwork techniques used in applied anthropology? How does applied anthropology benefit modern social problems? Thank you!
April 11, 2014

Cultural Anthropology
Contrast the four types of subsistence strategies, be sure to include differences in lifestyle, kinship, property, ownership, distribution of resources and division of labor. Thank you!
April 11, 2014

chemistry help~Please!!!
What are the Ka and/or Kb value for 1M ZnCl2 Show work please!!!
April 11, 2014

engineering
A certain amount of radioisotope (986.8 x 10-9 kg) is used to make the dial of a watch glow in the dark. If the half-life of this isotope is 3.69 x 103 years, how many kilograms of the radioisotope will disappear while the watch is in use for fifty years?
March 30, 2014

Calculus
When dy/dx=(x-6)^½ what does y equal?
March 29, 2014

physics
A plane is found by radar to be flying 5.9 km above the ground. The angle of elevation from the radar to the plane is 78.6°. Ten seconds later, the plane is directly over the station. Find the speed of the plane, assuming that it is flying level.
March 13, 2014

Single vs double replacement reactions
How would you compare a single replacement reaction to a double replacement reaction?in laymans terms?
February 26, 2014

Decomposition reaction
List the number of reactants and the number of products in a decomposition reaction; 2H2O(I)=2H2(g)+O2(g)
February 26, 2014

Synthesis reaction
What are the number of reactants and the number of compounds in; 2H2(g)+O2(g)=2H2O(I)
February 26, 2014

physics
I need to find the coefficient of the kinetic friction of the following: "a block weighing 300 newtons is moved at a constant speed over a horizontal surface be a force of 50 newtons applied parallel to the surface" would I do the following? k = coefficient of ...
February 18, 2014

Spanish
Is this correct? Complete the paragraph with the correct present-tense form of the most logical verb from the list below. Each verb will be used no more than once, and don’t forget the reflexive pronouns when appropriate. acostarse bañarse deletrear divertirse ...
February 10, 2014

physics
a 65kg person dives into the water from the 10m platform. she comes to a stop 2m below the surface of the water. what net force did the water exert on the swimmer? so for the net force i got -2548N i know: vf^2=vi^2 + 2ad vf^2 = 0 + 2(9.8)(10) vf^2 = 196 vf=14m/s therefore to ...
February 6, 2014

Spanish
Thank you SraJMcGin
January 29, 2014

Spanish
Are these correct? Answer the following questions using the present progressive. Be sure to answer with the same verb that is used in each question. 1. Creo que Xavier (1) _____ (2) __________ en la casa de sus padres mientras asiste a la Universidad. (vivir) Creo que Xavier (...
January 29, 2014

math
i was doing the mean theorem for this problem: (x+4)^2 (x-3) on [-4,3] i got to: 3x^2 + 10x-8=7 someone helped me out and told me the answer was (-5 +/- sqrt(70))/(3) but i don't know how to get to there, can someone please explain to me how to get to this point?
January 29, 2014

calculus
how did you get (-5 +/- sqrt(70))/3
January 28, 2014

calculus
i am on "rolles and the mean value theorem" and was just wondering, when i am doing rolles, do i really need to find the exact value of x where f'(c) = 0? for example: f(x) = (x+4)^2 (x-3) on [-4,3] i get to: 3x^2+10x-8=7 then i dont know if i then need to find ...
January 28, 2014

calculus
typo: 8 should = 8 i meant x should = 8
January 25, 2014

calculus
"superman is in level flight 6 miles above ground. his flight plan takes him directly over whs high school. how fast is he flying when the distance between him and the whs high school is exactly 10 miles and the rate is increasing 40mph?" i keep getting: r = 10 r'...
January 25, 2014

calculus
"superman is in level flight 6 miles above ground. his flight plan takes him directly over whs high school. how fast is he flying when the distance between him and the whs high school is exactly 10 miles and the rate is increasing 40mph?" i keep getting: r = 10 r'...
January 25, 2014

Spanish
Are these correct? Thank you for helping Finish the following sentences including at least one possessive adjective (mi[s], tu[s], su[s], nuestro[s] or nuestra[s]) in your answer. Ejemplo: La profesora que tiene mi amiga es antipática, pero "mis profesores son fant...
January 24, 2014

Spanish
Are these correct? I. Rewrite each sentence by replacing the direct object in quotation marks with a direct object pronoun [me, te, lo, la, nos, los, las]. Ejemplo: No conozco "al jefe del departamento." --> No lo conozco. 1. Esa compañía vende "...
January 23, 2014

Calculus
Water is leaking out of a pool at a rate of 4 cubic inches per second, what is the rate of change of the height of the water at the instant the volume equals 20ft cubic feet
January 22, 2014

calculus
what is the 2nd derivative of: 1-xy = x-y i get (-y-1)/(x-1) for the first the second i know is (-y-1)/(x-1)^2 but i keep getting (0)/(x-1)^2 please show me the steps i should be taking and if possible what i did wrong
January 20, 2014

calculus
a rectangle is 10 inches by 6 inches whose sides are changing. write a formula for both the perimeter and how fast each is changing in terms of L and W how do i do this, an explanation instead of an answer would be most appreciated, thanks in advance.
January 20, 2014

math
idk if this is supposed to be common sense but, i need help understanding why when i make this equation solve for (y) that there is a plus/minus answer. (yx)yx = 2x y = .5(sqrt(2x)/2) y = .5(-sqrt(2x)/2)
January 17, 2014

calculus
i need to use implicit differentiation to find the derivative: yx+y = 8 i keep getting y'=-1-y. i already know the derivative of this, by using explicit by simplification: y(x+1)=8 y=(8)/(x+1) y'= -(8)/(x+1)^2 how do i go about doing this the right way?
January 17, 2014

calculus
i need to find the derivative using chain rule: (x^2 + 2x - 6)^2 (1-x^3)^2 i got the answer from a site but the problem is i cannot get my work to match up with the answer, i dont know what im doing wrong. answer: 10x^9 + 36x^8 − 64x^7 − 182x^6 + 168x^5 + 80x^4 + ...
January 13, 2014

calculus
i need to find the derivative using chain rule and show steps: y= (x) / ((x^2)-1)^(-1/2) and is it possible to have free tutoring online like through a chatroom? i am in need of help
January 10, 2014

calculus
updating previous question so easier to understand im using chain rule to answer this question: f(x) = -5 sqrt(x^2 - 4x + 1) what is f'(x)? tried to use calculator to get the answer to base my answer off of but this is a nonreal number. does this mean i will have to use ...
January 8, 2014

calculus
im using chain rule to answer this question: -5 ((x^2) - 4x + 1)^(1)/(2) tried to use calc to get answer to base off of but this is a nonreal number. does this mean i will have to use imaginary numbers? please help
January 8, 2014

Calculus
Lim x to 3 (-x^2)/((x^2)- 6x + 9) substitution i get -9/0 factoring i get same answer would that mean the answer is infinity? if not how could i prove that it isn't infinity
December 12, 2013

Calc 2
Find the area enclosed by the equations x=16-y^2 and x=y^2-16
December 7, 2013

math
a brick is placed on a balance scale.it balances exactly with a 3/4 pound weight and 3/4 of a brick .what is the weight of the brick? show and explain work
November 11, 2013

accounting
A tabular analysis of the transactions made during August 2010 by Witten Company during its first month of operations is shown below. Each increase and decrease in stockholders' equity is explained. Assets = Liabilities + Stockholders' Equity Cash + Accounts Receivable...
November 9, 2013

Math
Marlon has 4 cards, lisa has 4 cards and sam has 3 cards. Can you write a multiplication sentence to find how many card they have in all? Explain
October 16, 2013

geometry
ABE and ECD are right triangles. BD is the base straight line and AC is the hypotenuse line intersecting at E.
October 13, 2013

geometry
AC and BD are straight lines, EB=16, DE=24, BC=10. What is the length of AD
October 13, 2013

physics
A hot air balloon is ascending straight up at a constant speed of 6.50 m/s. When the balloon is 13.0 m above the ground, a gun fires a pellet straight up from ground level with an initial speed of 34.0 m/s. Along the paths of the balloon and the pellet, there are two places ...
September 10, 2013

math
you need to prepare 5ml NaCl solution . you already have a stock solution of 10% NaCl that you are asked to use . how many ul NaCl solution would you need to make 5ml of a 2% NaCl solution?
September 2, 2013

physics
(a) How much waste heat is produced by an electrical power station that uses 1.05 multiplied by 1014 J of heat input with an efficiency of 40.0%? (b) What is the ratio of waste heat to work output? (c) How much work is done?
July 24, 2013

physics
The engine of a large ship does 2.05 multiplied by 108 J of work with an efficiency of 4.00%. (a) How much waste heat (J) is produced? (b) How many barrels of fuel are consumed, if each barrel produces 6.00 multiplied by 109 J of heat when burned?
July 24, 2013

physics
A certain heat engine does 8.0 kJ of work and dissipates 8.00 kJ of waste heat in a cyclical process. (a) What was the heat input to this engine? (b) What was its efficiency?
July 24, 2013

physics
A hand-driven tire pump has a 2.50 cm diameter piston and a maximum stroke of 31.0 cm. (a) How much work (J) do you do in one stroke if the average gauge pressure is 2.40 multiplied by 105 N/m2 (about 35 psi)? (You may consider this an isothermal process.) (b) What average ...
July 24, 2013

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density(kg/m^2))of the full gas can, taking into account the volume occupied by steel as well as by gasoline?
July 22, 2013

physics
(a) A rectangular gasoline tank can hold 41.0 kg of gasoline when full. What is the depth(m) of the tank if it is 0.400 m wide by 0.900 m long? (b) What is the volume(gal) of the tank? (It is suitable for a passenger car.)
July 22, 2013

physics
The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 280 g of hot coffee initially at 90.0°C if 2.50 g evaporates from it? The coffee is in a ...
July 21, 2013

physics
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat is required to melt ...
July 21, 2013

physics
In 1986 a gargantuan iceberg broke away from the Ross Ice Shelf in Antarctica. It was approximately a rectangle 160 km long, 45.0 km wide, and 250 m thick. (a) What is the mass of this iceberg, given that the density of ice is 917 kg/m3? (b) How much heat is required to melt ...
July 20, 2013

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.80 g of condensation forms on a glass containing water and 170 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 20, 2013

physics
The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 7.40 g of condensation forms on a glass containing water and 210 g of ice, how many grams will melt as a result? Assume no other heat transfer occurs. Use the heat ...
July 19, 2013

physics
An ice bag containing 0°C ice is much more effective in absorbing heat than one containing the same amount of 0°C water. (a) How much heat in kcal is required to raise the temperature of 0.700 kg of water from 0°C to 27.0°C? (b) How much heat is required to ...
July 19, 2013

physics
A 3.00 g lead bullet traveling at 640 m/s strikes a target, converting its kinetic energy into thermal energy. It's initial temperature is 40.0°C. (a)Find the available kinetic energy of the bullet.(J) (b)Find the heat required to melt the bullet.(J)
July 19, 2013

physics
This is my answer: Delta T=(30N*18*0.075m)/(0.100kg*3500J/kg.C)
July 19, 2013

physics
Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 30.0 N, what is the temperature increase? The mass of tissue warmed ...
July 19, 2013

physics
The same amount of heat entering identical masses of different substances produces different temperature changes. Calculate the final temperature when 1.25 kcal of heat enters 1.25 kg of the following, originally at 20.0°C. (a) water (b) concrete (c) steel (d) mercury
July 19, 2013

physics
A 2.60 kg steel gas can holds 15.0 L of gasoline when full. What is the average density of the full gas can, taking into account the volume occupied by steel as well as by gasoline? Please show the steps, thanks.
July 19, 2013

physics
A 1.80 m radius playground merry-go-round has a mass of 120 kg and is rotating with an angular velocity of 0.300 rev/s. What is its angular velocity after a 19.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest.
July 18, 2013

finance
11.17
July 15, 2013

Economics
Thomas Schelling, an expert on nuclear strategy and arms control, observed in his book The Strategy of Conflict (Cambridge, MA: Harvard University Press, 1960), "The power to constrain an adversary depends upon the power to bind oneself." Explain this statement using...
July 15, 2013

Economics
Some states have had laws restricting the sale of most goods on Sunday. Consumers, by and large, oppose such laws because they find Sunday afternoon a convenient time to shop. Paradoxically, retail trade associations frequently support the laws. Discuss the reasons for ...
July 15, 2013

Economics
The well known nationally syndicated columnist David Broder reported the recent findings of two academic political scientists. These scholars found that voters are quite turned off by negative campaigns of politicians. Many people went as far as not voting because of this ...
July 15, 2013

Economics
When McDonald’s Corp. reduced the price of its Big Mac by 75 percent if customers also purchased french fries and a soft drink, The Wall Street Journal reported that the company was hoping the novel promotion would revive its U. S. sales growth. It didn’t. Within two...
July 15, 2013

chemistry
How much faster will neon effuse than krypton, given that the molar mass of krypton is 83.8 grams and that of neon is 20.18 grams?
July 14, 2013

Statistics
In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the standard deviation is 27 ...
June 2, 2013

Statistics
In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the standard deviation is 27 ...
June 2, 2013

English IV
Score: "I always lie" is an example of which of these literary devices? A)paradigm B)paradox C)metaphor D)personification E)none of these
May 23, 2013

Calculus
Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^2-4/(1+cos(t)^2) dt x^2-4/(1+cos(x)^2)= 0 x^2-4=0 x^2=4 x= +/- 2 So I got relative maximum as -2 and 2. And relative minimum as zero. However, when I graph it on Wolfram, it gives me ...
May 20, 2013

Minima Maxima
Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^2-4/(1+cos(t)^2) dt x^2-4/(1+cos(x)^2)= 0 x^2-4=0 x^2=4 x= +/- 2 So I got relative maximum as -2 and 2. And relative minimum as zero. However, when I graph it on Wolfram, it gives me ...
May 18, 2013

Followup-Calculus-Extrema
I got +/-4.99 and +/-7.99 when I typed the keyword 'local maximum x^2-4/(1+cos(x)^2)' into the equation box. It just gave me a list of maxima.
May 17, 2013

Followup-Calculus-Extrema
Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^2-4/(1+cos(t)^2) dt x^2-4/(1+cos(x)^2)= 0 x^2-4=0 x^2=4 x= +/- 2 So I got relative maximum as -2 and 2. And relative minimum as zero. However, when I graph it on Wolfram, it gives me ...
May 17, 2013

MATH HELP!!
Mr. Reiny's doing permutations. A permutation is when order matters. In this case, you can't have any ties: you can only have one person for first place, one person for second place, and similarly one person for third place. Therefore, there are 12 horses competing for...
May 17, 2013

Extrema-Check my work please?
Find and classify the relative maxima and minima of f(x) if f(x)= defint a=0 b=x function= t^2-4/(1+cos(x)^2) dt x^2-4/(1+cos(x)^2)= 0 x^2-4=0 x^2=4 x= +/- 2 So I got relative maximum as -2 and 2. And relative minimum as zero. However, when I graph it on Wolfram, it gives me ...
May 17, 2013

Sums-Calc
I see what I did now. Thanks
May 15, 2013

Sums-Calc
find the upper and lower bounds for definite integral sign, a=1, b=6, sqrt(x) dx. partitions are as follow: x0=1, x1= 3, x2=6 of the interval [1,6] upper sum: 3sqrt(3) + 3sqrt(6) lower sum: 3sqrt(3) + 3 but this is incorrect. can someone explain what i did wrong please
May 15, 2013

Upper-lower bounds-solved
find the upper and lower bounds for definite integral sign, a=1, b=6, sqrt(x) dx. partitions are as follow: x0=1, x1= 3, x2=6 of the interval [1,6] upper sum: 3sqrt(3) + 3sqrt(6) lower sum: 3sqrt(3) + 3 but this is incorrect. can someone explain what i did wrong please
May 15, 2013

definite integral
wow I didn't think it was so simple. thank you !
May 15, 2013

definite integral
Use the Riemann Sums corresponding to 5 inscribed rectangles of equal width to approximate the integral a= 1, b= 3, (1/x)dx this is all for definite integral i just know x1=1.4, x2=1.8, x3=2.2, x4=2.6, x5=3.0 how do i continue
May 15, 2013

integral
Oh okay thank you!
May 15, 2013

integral
Thank you very much! I really didn't understand the form but now I do. :) Also, would d2y/dx2 be: -9(6x+1)/((9x^2+3x+1)^2) I just want to make sure that d2y/dx2 is asking for the second derivative?
May 15, 2013

integral
but i dont get how you can just replace the variable t with x so easily. i dont get how you did that. and how does the 3 come into the picture for dy/dx.
May 15, 2013

integral
can you explain how you got this. thanks
May 15, 2013

integral
Find dy/dx and d2y/dx2 if y= definite integral sign where a= 1 and b= 3x 1/(t^2+t+1) dt how do i even start. do i integrate and then plug in a and b? plz help.
May 15, 2013

calculus-extrema
Thank you!
May 15, 2013

calculus-extrema
Find and classify the relative maxima and minima of this function f(x)= definite integral sign where a=0 and b=x. t^2-4/(1+(cos^2(t)) dt what should my value for u be? is it just t. not sure how to even tackle this problem.
May 15, 2013

calculus solved
I see what i did wrong. thanks!
May 15, 2013

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