# Posts by Erica

Total # Posts: 625

**Pre algebra **

Please help I’m struggling with how to find the percent of change each decade and how to predict a future price. I can’t find any examples of this lesson for help Directions: You probably see them in the news all the time—predictions about prices, jobs, stocks, ...

**Math**

Suppose that license plates in a certain country are made up of three letters followed by 2 digits followed by 3 more letters. How many license plates can be made if no repetitions are allowed within each set. (That is, no repetition within the first set of letters, the set of...

**math**

A university has 1500 students out of which 500 are history students, 800 are English students and 200 are both history and English students. Are the events of a student being an English student or a history student independent ?

**math**

A card is selected from a deck. Find the following probabilities. A standard deck of cards has 52 Cards. There are 13 values and 4 suits. Suits are Spades, Clubs, Diamonds and Hearts. Each suit has 13 cards. There are 3 face cards Jack, Queen, and King. a red card = 26/52 = 1/...

**math**

An employee saves for her retirement by depositing $1000 a quarter. She deposits her money in an annuity which pays a return of 2% a year compounded quarterly. What will the value of the annuity be after ten years? This is my answer is this correct? A((1+i)^n-1)/I = 44158.85

**Maths**

Nine Bottles Hold 4.5 litres of water altogether? how many will 5 bottles hold?

**Algebra**

How much weight will a 4 I ch wide 4 inch high and 216 inches long beam support

**Trigonometry **

Find the remaining trigonometric values if sin=-3/5 and theta terminates in Quadrent four. I'm not sure what they're asking

**Math **

A map is drawn to a scale 0f 1 :20 000. Calculate the area of a a lake that measures 3 square km

**American Government**

Why do presidents prefer federal judges who tend to agree with their views?

**math**

a beverage bottle can hold 750 milliliters of liquid, and one liter is equal to 1000 milliliters. what percent of a liter can the bottle holds

**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.

**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...

**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.

**science**

which of the following is true about photosynthesis

**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}

**Nonhomogenous DE**

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

**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...

**Linear or Nonlinear, Order.**

(a) y''' + y' - xy = x (b) y'' - y' = xy2 (c)x/y = y' (d)(xy')' = cos x

**Math**

32.3 mph

**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 ...

**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) ...

**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 ...

**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...

**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 ...

**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...

**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 ...

**Lifespan Development**

b. gender stability/gender constancy

**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?

**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?

**Calculus**

Thanks, Scott! I got the height as 16 and distance as 12m.

**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.

**math**

the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers

**math**

the sum of three consecutive numbers is eighteen. Write an expression describing the equation and solve the state of the three numbers

**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)

**Math**

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

**AR**

20 five pound bags of apples 4 apples is equivalent to 1 pound. There are 400 apples. Divide 400 by 20 and you get 20. 400/20=20

**AR**

100 five pound bags of apples 4 apples is equivalent to 1 pound. There are 400 apples. Multiply 400 by .25 and you get 100...400*.25=100.

**AR**

100 apples 4 apples is equivalent to 1 pound. There are 400 apples. Multiply 400 by .25 and you get 100...400*.25=100.

**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 ...

**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 ...

**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

**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...

**Physics HELPPP**

(0 m/s)^2 - (23.7 m/s)^2 divided by 2(9.00 m/s)^2 ?

**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...

**medical terminology for healthcare professions**

how do i create a 7-10 slide microsoft power point presentation

**math**

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

**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

**Math**

y=2x-4 6x-12=3y

**chemistry**

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

**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)

**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)

**chemistry**

Convert 1.01 x 10-8 seconds to nanoseconds

**chemistry**

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

**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)

**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 ...

**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): ...

**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?

**pol**

The various cases with regards to religious freedom are concerned with excessive entanglements between government and religion. This means

**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?

**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.

**Math please check**

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.

**calculus Please Help**

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

**calculus Please Help**

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 ...

**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?

**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....

**Trig**

A jet is 115 mi east and 88.3 i north of Niagara Falls. What is its displacement from Niagara Falls?

**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.

**math**

a person who writes ads for an inn.

**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)

**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 ...

**History**

I also agree

**Accounting**

1256895

**business math**

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?

**math**

8 < 5 + y

**math**

A certain test is worth 145 points. How man points are needed to obtain a score of $65%?

**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

**Math 221**

What is 5/12+7/9 in simplest form

**Math 221**

What is 78 over 25 as a decimal?

**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

**Math 221**

what is the perimeter of a square using 13ft.

**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 ...

**Math 221**

The answer that I got was 13x10=130 and 15x7=105

**Math 221**

what is 13/15 divided by 7/10

**PHI208: Ethics and Moral Reasoning**

Which one of these is not a principle that can be drawn from the Categorical Imperative?

**PHI208: Ethics and Moral Reasoning**

What other similarity can we find in Freeman’s stakeholder theory with Kant’s moral theory

**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?

**MATH HELP ASAP**

b. w2+20w=1125

**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?

**Ethics in Criminal Justice**

OK. So the answer is D - none of the above.

**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.

**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?

**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.

**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. ...

**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&#...

**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 ...

**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...

**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.

**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?

**Ethics in Criminal Justice**

After reading it again, I think it may be C now.