Tuesday
December 6, 2016

# Posts by Erica

Total # Posts: 604

Cal 3
Find critical points for f(x,y)= x^3+y^3-15x^2-6xy+18y^2+39x+138y I know you first take the partial derivative of x and y, but I am not sure where to go from there.
December 6, 2016

Probability/Distribution
A catalyst researcher states that the diameters (in microns) of the pores in a new product catalyst she has made have an exponential distribution with parameter ë = 0.25 (35 pts). (a) Determine the mean pore size. (b) Determine the standard deviation of the pore diameters...
October 11, 2016

Statistics/Probability
An observer has measured the starting position of a toy vehicle as xs = 9.3 ± 0.2 m and the finishing position as xf = 14.4 ± 0.3 m. Calculate the displacement and the error in the displacement. I am not sure where to start at all.
October 10, 2016

science
which of the following is true about photosynthesis
October 6, 2016

Nonhomogenous DE
Forgot to put the options, didn't know how to go about getting answer, didn't want to just guess. A. y={x^2}/{15} B. y= {x^2}/{15}-{x}/{6} C. y=-{x}/{6} D. y=x^2-{x}/{6}+{1}/{x}
October 5, 2016

Nonhomogenous DE
Which of the following are solutions of 2x^2y'' + 5xy' + y = x^2-x on(0,infty)?
October 5, 2016

Engineering Linear Equation
At your initial meeting with your business partners for CellGenTech, you propose that the rate of change in the number of newly introduced cell lines that the company scientists should be able to produce should be proportional to the number of cell lines. The company initially...
October 5, 2016

Linear or Nonlinear, Order.
(a) y''' + y' - xy = x (b) y'' - y' = xy2 (c)x/y = y' (d)(xy')' = cos x
October 3, 2016

Math
32.3 mph
September 27, 2016

Engineering Math
Assume that the number of ﬁsh P(t) after t years grows according to the logistic equation dP/dt= P(a-bP) = bP(300 − P) Find the solution of this DE (with the given initial value at t = 0) as a separable equation. Your solution formula will contain b as an unknown ...
September 27, 2016

Engineering Math Growth
I am having trouble figuring out where to start with this one. Biologists stocked a lake with 40 ﬁsh and estimated the carrying capacity (the maximal population for the ﬁsh of that species in that lake) to be 300. (a) Assume that the number of ﬁsh P(t) ...
September 26, 2016

Newtons Cooling Method
Instructions Assume that goat milk butter melts at {85.25}^{\circ} F. On a summer day you take a stick of butter out of the refrigerator, which is set to {36.5}^{\circ} F, and put it on your front porch where the temperature is {89.5}^\circ F. (a) By Newton's Law of ...
September 23, 2016

ODE Piecewise
Solve the piecewise linear ODE, y' - y = f(x), y(0) = 1, where f(x) = 1 when 0 \le x \le 1 and f(x) = -1 when x > 1. What is y(2)? Round to the nearest tenth. I stated and got y'-y= ce^x , but wasn't really sure if that was right so I didn't know where to go...
September 23, 2016

Engineering Math
I don't know where to start on this one. A thermometer is taken from an inside room to the outside, where the air temperature is ten degrees Fahrenheit. After one minute the thermometer reads 40 degrees Fahrenheit, and after two minutes it reads twenty-five degrees ...
September 23, 2016

Engineering Math, Newtons Cooling Method
Newton's equation for a free falling object with air resistance of mass m kilograms says that its velocity v(t) satisfies the DE mv'(t) = mg - kv(t) where g = 9.8 \frac{m}{s^2} and v(t) is measured in \frac{m}{s}. Suppose that k=2 \frac{kg}{sec} and that a ball of mass...
September 23, 2016

Engineering Math
An unknown radioactive element decays into non-radioactive substances. In 120 days the radioactivity of a sample decreases by 59 percent. What is the half life of the element? How long will it take for a sample of 100 mg to decay to 77 mg? The answer is not 93 day, I ...
September 23, 2016

Physics
A car goes North at 55mi/hr for 1.3 hrs. It then goes East at 65mi/hr for 45 min. What is the total distance travelled, total displacement,average speed and average velocity of the car?
September 9, 2016

Trigg
A force vector has a magnitude of 475 newtons and points at an angle of 26.0 degrees below the negative x axis. What are the x scalar components and y scalar components?
September 5, 2016

Calculus
Thanks, Scott! I got the height as 16 and distance as 12m.
July 23, 2016

Calculus
A 20m ladder is leaning against a wall. Top of ladder is sliding down at 3m per second and the bottom is sliding away from the wall at 4m per second. How high is the top of the ladder and far is the bottom of the ladder from the wall.
July 23, 2016

math
the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers
July 20, 2016

math
the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers
July 20, 2016

Math Help
1.) Find the arc length y=2/3x ^3/2 + 2 over (14,16) 2.) Find the arc length y=8x^3/2+7 over (0,6)
May 15, 2016

Math
Find the exponential function that passes through (0,5) and (4, 1/2). Formula is y=Ce^kx
May 15, 2016

CHEM
am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentration between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH based on the concentrations using the ...
April 5, 2016

CHEM
I am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentraion between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH baces on the concentrations using the ...
April 5, 2016

Math
The figure below are similar (their rectangles) find The value of x. Skinny rectangle has 2 on the top, and it has 4 on the side. Bigger rectangle it's side ways, it has 8 on the top and x on the side
April 4, 2016

Physics please i really need help
Suppose a car is traveling at +23.7 m/s, and the driver sees a traffic light turn red. After 0.427 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 9.00 m/s2. What is the stopping distance of the car, as measured from the point where...
February 1, 2016

Physics HELPPP
(0 m/s)^2 - (23.7 m/s)^2 divided by 2(9.00 m/s)^2 ?
February 1, 2016

Physics
The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.0 s. Initial Velocity (a) +12 m/s (b) +12 m/s (c) -13 m...
February 1, 2016

medical terminology for healthcare professions
how do i create a 7-10 slide microsoft power point presentation
January 16, 2016

math
if jen runs 1/12 mole each day , how many days will it take for her to run 2/3?
January 6, 2016

Math
I do not know how to do this problem can someone help me please. Thank you. Determine if the given ordered triple below is a solution. (3, 3, -5) x + 9y = 30 2x - 8y = -18 5y + 2z = 5
October 20, 2015

Math
y=2x-4 6x-12=3y
October 20, 2015

chemistry
Convert 15 ºF to degrees K. (Just type the number with correct sig figs, do worry about finding the degree symbol)
September 14, 2015

chemistry
A tank holds 52.9 cm3 of water. What is the volume in in3? (2.54 cm=1 in, Remember significant figures, but this answer does not need units, since the answer must be in in3)
September 14, 2015

chemistry
A student measure 9.43 mL of an unknown liquid in a graduated cylinder. The mass of the empty cylinder is 34.670 g, and the mass of the cylinder and liquid is 44.197 g. What is the density of the unknown liquid? (remember significant figures and units in your answer)
September 14, 2015

chemistry
Convert 1.01 x 10-8 seconds to nanoseconds
September 14, 2015

chemistry
How many inches are in 2.41 m? (2.54 cm = 1 inch, remember significant figures and units)
September 14, 2015

Chemistry
The density of aluminum is 2.70 g/ml. What is the mass of a cube of Al that measures 2.20 cm on each side?(remember significant figures and to include the units of g in your answer, remember that 1 ml=1 cm3)
September 14, 2015

Psychology
Classical Conditioning. 2. Pat feels fear whenever she sees snow. Not too long ago, she got into a car accident on a snowy road. a. Name the unconditioned stimulus(US): Car accident b. Name the conditioned stimulus(CS): Seeing snow c. Name the unconditioned response(UR): Fear ...
July 12, 2015

Psychology
Classical Conditioning. 1)Terell feels ill every time he sees a Wendy's restaurant sign. Two weeks ago while on his lunch break, he went to Wendy's and ate a chicken sandwich. He was not aware that the chicken was spoiled. a. Name the Unconditioned Stimulus(US): ...
July 12, 2015

math
A farmer is installing a fence. The coordinates of the vertices of the fence are A(2,2), B(2,6), C(8,6), D(8,2). If each grid square has length of 9 yards, how much wire is needed for the fence?
May 12, 2015

pol
The various cases with regards to religious freedom are concerned with excessive entanglements between government and religion. This means
April 28, 2015

Math
A document that measures 28 centimeters by 20 centimeters is enlarged by a scale factor of 3/2. What are the dimensions of the enlarged documents?
March 21, 2015

math
You have to set up a proportion. The 20 goes diagonal to the 25. 1 goes in the denominator of the 20. The answer goes in the numerator of the 25.
February 27, 2015

Find the equation of the line that contains the point (3, 2) and is parallel to the line 3x − 9y = 0. I know I solve for y and I get y= -3x/-9 but I am not sure where to go from here please help.
December 5, 2014

My answer is saying it is -1400/x^2 -0.01 but I got C'(x) = 6 - 0.02x. Why is this?
December 5, 2014

The cost for a toy company to produce x Cosmic Starships is C(x) = 1400 + 6x − 0.01x2. What ￼￼￼￼￼￼￼￼￼￼is the marginal average cost function? Can someone please explain how to do this to I have no idea ...
December 5, 2014

mat
Becky used 5 teaspoons of mustard to make a 32 ounces of potato salad. How many teaspoons of mustard does she need to make 4 pounds of potato salad?
December 5, 2014

Trig
a ships navigator determines that the ship is moving through the water at 17.5mi/h with a heading of 26.3 degrees north of east but the ship is actually moving at 19.3 mi/h in a direction of 33.7 degrees north of east. What is the velocity of the current? would this be 17....
December 1, 2014

Trig
A jet is 115 mi east and 88.3 i north of Niagara Falls. What is its displacement from Niagara Falls?
December 1, 2014

statistics
In a correlation study, we seek to determine; *if the IV cause an outcome in the DV. *Which variable is the cause and which variable is the effect. *The direction of causation. *How well one variable predicts another variable.
November 24, 2014

math
a person who writes ads for an inn.
November 9, 2014

algebra
Write the equation of the line that is parallel to the given line and passed through the given point. Y=3x-8; (0,2)
November 4, 2014

physics
A red ball is thrown down with an initial speed of 1.4 m/s from a height of 28 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.9 m/s, from a height of 0.9 meters above the ground. The force of ...
October 6, 2014

History
I also agree
October 2, 2014

Accounting
1256895
September 26, 2014

Lane French had a bad credit rating and went to a local cash center. He took out a $100.00 loan payable in two weeks at$105.50. What is the percent of interest paid on this loan?
July 31, 2014

math
8 < 5 + y
July 27, 2014

math
A certain test is worth 145 points. How man points are needed to obtain a score of $65%? July 27, 2014 Math 221 Math 221 - Ms. Sue, Sunday, July 13, 2014 at 2:24pm I've done several problems for you. Now it's your turn. How do you think this problem should be solved? Answer this Question I was thinking that I should multiply the numerators and denominators July 13, 2014 Math 221 What is 5/12+7/9 in simplest form July 13, 2014 Math 221 What is 78 over 25 as a decimal? July 13, 2014 Math 221 what is the perimeter of a square using 13ft. Math 221 - Ms. Sue, Sunday, July 13, 2014 at 1:56pm Is 13 ft the length of a side of the square? yes July 13, 2014 Math 221 what is the perimeter of a square using 13ft. July 13, 2014 Math 221 Math 221 - Ms. Sue, Sunday, July 13, 2014 at 1:22pm (13/15) / (7/10) (13/15) * (10/7) = Multiply the numerators together. Multiply the denominators together. What do you get? Math 221 - Erica, Sunday, July 13, 2014 at 1:26pm The answer that I got was 13x10=130 and 15x7=105 ... July 13, 2014 Math 221 The answer that I got was 13x10=130 and 15x7=105 July 13, 2014 Math 221 what is 13/15 divided by 7/10 July 13, 2014 PHI208: Ethics and Moral Reasoning Which one of these is not a principle that can be drawn from the Categorical Imperative? July 8, 2014 PHI208: Ethics and Moral Reasoning What other similarity can we find in Freeman’s stakeholder theory with Kant’s moral theory July 8, 2014 finite math (probability Suppose you toss a coin 100 times and get 72 heads and 28 tails, what is the probability that the next flip result in a tail? June 17, 2014 MATH HELP ASAP b. w2+20w=1125 May 19, 2014 chemistry A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million? I know the equation is: ppm= (mass of solute/mass of solution)10^6 Does the mass need to be in g or kg? May 11, 2014 Ethics in Criminal Justice OK. So the answer is D - none of the above. May 10, 2014 Ethics in Criminal Justice The correlativity of rights and duties mean that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which other must abide. D. None of the above. I think the answer is A but not sure. May 10, 2014 Ethics in Criminal Justice The correlativity of rights and duties means that: A. moral duties override moral rights. B. moral rights override moral duties. C. the existence of moral rights implies duties by which others must abide. D. None of the above. I think it's B. Am I right? May 8, 2014 math The student council has decided to sell t-shirts for a fundraiser. The printing company charges a$75 set-up fee plus $3 per shirt. The student council plans to sell their t-shirts for$12 per shirt. Write a function p(t) to represent the student council's profits.
May 5, 2014

Criminal Justice - Ethics
Which of the following concepts best captures the utilitarian notion that each person's welfare is equally important and, thus, that no one person's happiness should be regarded as more important than any other person's? A. Fecundity B. Psychological hedonism C. ...
May 4, 2014

chemistry
From the reaction below, calculate the free energy of formation for CH4(g) at 25°C, if ΔGfo(C8H8(g)) is 214.417 kJ/mol. 8CH4(g) ↔ C8H8(g) + 12H2(g) ΔGo = 620.735 kJ/mol I don't understand what equation to use. I thought it was dGfo-dGo but that doesn&#...
May 3, 2014

Ethics in Criminal Justice
The rational, overriding principle promoted by utilitarianism is the: A. Greatest number principle. B. Greatest happiness principle. C. Greatest utility principle. D. None of the above. Now my textbook mentions two in this sentence: "The rational, overriding principle ...
May 3, 2014

Ethics in Criminal Justice
The argument that aiding or assisting others might be degrading to them, implying that they are incapable of helping themselves, is an argument commonly used to support: A. Qualitative varieties of utilitarianism. B. Hedonism. C. Ethical egoism D. Plea bargaining. My answer is...
May 3, 2014

Criminal Justice
Which of the following principles approves or disapproves of an action according to its tendency to promote happiness for the greatest number of people? A. Altruism B. Utility C. Hedonism D. Egoism I am stuck between B and C, but leaning towards B. Please help.
May 3, 2014

Math word problem
A dealer bought some grapefruits for $1.04. After throwing away 4 bad ones, he sold the other ones at 6 cents apiece more than he had paid for them and made a profit of$0.22. How many did he buy?
May 3, 2014

Ethics in Criminal Justice
After reading it again, I think it may be C now.
April 27, 2014

Ethics in Criminal Justice
Engaging in lawbreaking behavior to achieve a reputation or gain status among peers would be most consistent with which of the following stages of moral development, according to Kohlberg's model? A. Punishment/Obedience B. Law and Order C. Social Contract D. Interpersonal...
April 27, 2014

Ethics in Criminal Justice
Which of the following refers to a form of human motivation whereby our decisions and actions are motivated primarily (if not exclusively) by our own interests? A. Egoism B. Psychological determination C. Altruism D. Ethnocentrism Is it A?
April 26, 2014

Ethics in Criminal Justice
Which of the following might help us develop open-mindedness and the virtue of tolerance? A. Recognizing that people have free will. B. Recognizing that moral norms can and often do vary by time and place. C. Developing our own sense of egoism. D. All of the above. After re-...
April 21, 2014

Ethics in Criminal Justice
Which of the following might help us develop open-mindedness and the virtue of tolerance? A. Recognizing that people have free will. B. Recognizing that moral norms can and often do vary by time and place. C. Developing our own sense of egoism. D. All of the above. I think it...
April 21, 2014

Moms day question
How about a nice body wash set?
April 21, 2014

Moms day question
How much are you willing to spend?
April 21, 2014

Math
If a number of 2 digits is divided by the sum of its digits, the quotient is 2 and the remainder is 2. If it's multiplied by the sum of its digits, the result is 112. Find the number.
April 17, 2014

Ethics in Criminal Justice
A. Free Will?
April 13, 2014

Ethics in Criminal Justice
The power to make choices and engage in actions that originate with ourselves is referred to as: A. Free will B. Objectivism. C. Determination. D. Predetermination.
April 13, 2014

Ethics in Criminal Justice
I would have to type it from the text book. It's 2 pages long.
April 13, 2014

Ethics in Criminal Justice
It is very confusing.
April 13, 2014

Ethics in Criminal Justice
I'm guessing D, but not sure.
April 13, 2014

Ethics in Criminal Justice
If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. The value of modern science. C. Moral responsibility. D. Excuses for criminal conduct.
April 13, 2014

PHI 208 Week 3 Reading Quiz
How does Milton Friedman present the common understanding of socially responsible acts on the part of business? All of the above
April 6, 2014

PHI 208 Week 3 Reading Quiz
Milton Friedman observes that if the same argument that advocates of corporate social responsibility say should be brought to corporate shareholders is instead brought before union members, the logical bankruptcy of the argument would be clearly evident because
April 6, 2014

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