Tuesday

September 2, 2014

September 2, 2014

Total # Posts: 965

**Trig**

What is the exact value of tan(s+t) if sin(s+t)=56/65. And cos(s)=5/13 and sin(t)=4/5. Everything is in the first quadrant
*March 19, 2013*

**calculus 1**

A kite 100 ft above the ground moves horizontally at a speed of 10 ft/s. At what rate is the angle (in radians) between the string and the horizontal decreasing when 200 ft of string have been let out?
*February 26, 2013*

**math**

Find the density of an object which has a mass of 360 grams and fills a volume of 36 mL.
*February 19, 2013*

**calculus**

A batter hits a ball 3 feet from home plate along the path x=69t, y=3+40t-16t^2. How long is the ball in flight and how far does it travel?
*February 9, 2013*

**math**

Find an equation of the line that passes through the point and has the indicated slope m. (23, 5); m = -2 y=?
*February 6, 2013*

**spanish 102**

I only have the last 3: ¿Te cepillaste los dientes después de comer? Sí, me cepillé los dientes después de comer. ¿Se maquilla Julia antes de salir a bailar? Sí, Julia se maquilla antes de salir a bailar. ¿Se duchan ...
*February 3, 2013*

**math**

which is a better buy an square pizza that is 8"x8" and cost $10 or a round pizza that is 9" in diameter for the same price?
*February 1, 2013*

**english**

One of the following sentences contains an independent clause and a dependent clause, which makes it a complex sentence. Which is the complex sentence? A. I hesitated a moment, but her smile gave me courage. B. I came home; I saw an envelope in the mailbox. C. Jenny was the ...
*January 30, 2013*

**english**

One of the following sentences contains an independent clause and a dependent clause, which makes it a complex sentence. Which is the complex sentence? A. I hesitated a moment, but her smile gave me courage. B. I came home; I saw an envelope in the mailbox. C. Jenny was the ...
*January 30, 2013*

**Physics 1**

A ball starts from rest and rolls down a hill with uniform acceleration, traveling 150 m during the second 5.0 s of its motion. How far did it roll during the first 5.0 s of motion?
*January 24, 2013*

**Calculus 3**

Find the equation of the plane that passes through (1,0,0) and is perpendicular to the line r=<1,0,2>+t<1,0,1>. The vector equation of a plane is n*(r-rsub0)=0. Thank you so much for your help!
*January 24, 2013*

**Anatomy and physiology**

1)Why is enzymatic catalysis essential for life? Describe in detail the mechanism for enzyme mediated anabolic and catabolic reactions. What are the various modes of inhibition. 2) "every energy transfer increases the entropy of the system" .why? (hint- law of ...
*January 21, 2013*

**math**

If the first marble is replaced before the second marble is drawn, what is the probability of selecting a white marble then a red marble? there are 4 red marbles 5 white and 3 blue
*January 18, 2013*

**Calculus 3**

Let L be the line that passes through the points (0,1,6) and (0,3,2). Find the length of the projection of k=<0,0,1> on the line L. I know how to do this if one part of the vector k is touching the line, but unless i'm mistaken, that is not the case in this question...
*January 16, 2013*

**Calculus 3**

Let L be the line that passes through the points (0,1,6) and (0,3,2). Find the length of the projection of k=<0,0,1> on the line L. I know how to do this if one part of the vector k is touching the line, but unless i'm mistaken, that is not the case in this question...
*January 16, 2013*

**Calculus 3**

i'm confused on how you got u=(1,1) and v=(1,sqrt2). Shouldn't they each have 3 coordinates? u=<0,1,1> and v=<1,sqrt2,0> ???
*January 16, 2013*

**Calculus 3**

Let u=j+k and v=i+jsqrt2. a) Calculate the length of the projection of v in the u direction. b) Calculate the cosine of the angle between u and v. Your help is very much appreciated!
*January 16, 2013*

**math**

solve the following exponential equation e^x-4=-e^-x when I work i get x-In(u) is this correct
*January 9, 2013*

**calculus**

use the properties of logarithms to condense the logarithmic expression. write the expression as a single logarithms whose coeffient is 1. Inx+In5=? Can you show work
*January 7, 2013*

**calculus**

I am sorry. This is the equation. Solve the follow exponential equation e^x+e^-x=6
*January 6, 2013*

**calculus**

solve the inequality e^x+e^x-x=6 can you show work
*January 6, 2013*

**calculus**

should I go farther or is that it. I don't know it that it the final answer--I think that is what is bothering me?
*January 4, 2013*

**calculus**

solve the logarithmic equation. Be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root x+7=1 I get this far and then get stuck, can you help me? In square root x+7=1 e=square root x+7 e^2=x+7 x+7=e^2 x=e^2-7
*January 4, 2013*

**math**

chane the logarithmic expression to an equivalent expression involving an exponent log416=x **the 4 is supposed to be dropedd down lower by the g.**
*January 3, 2013*

**math**

find the inverse of the following function. find the domain, range and asymptotes of each. f(x)=In(x+1)+1 please show work.
*January 2, 2013*

**math**

Yes, Reiny you caught the typo It should read f(x)=x^2+2x-8, thank you for catching that. So, now my answers will change that Riana gave. Right?
*January 1, 2013*

**math**

answer the following for the given quadratic function. f(x)=x^2+x^2-8 a. what is the vertex (h,k) of f? (h,k)=? simplify your answer and type the answer in an ordered pair b. what is the axis of symmetry?
*January 1, 2013*

**math**

x+6=> if -5 less or equal to x < 1 9=> if x=1 -x+5=> if x>1 Sorry, still learing exactly how to post questions with the right signs the right way.
*January 1, 2013*

**math**

the function f is defined as the follows f(x)={x+6 if -5 less than or equal to x < 1 {9 if x = 1 {-x+5 if x > 1 a. find the domain of the function f is? b. locate any intercepts; if any please show work
*January 1, 2013*

**calculus**

solve the following inequality 15x-16 less than or equal to 15/x is the point x=0 included in the solution set of the inquality? are the other finite pointsa of the interval included in the solution set? what is the solution set? please show work
*December 27, 2012*

**calculus**

find the function that is finally graphed after the following transformations are applied to y=square root x in the order listed. a. reflected about the x-axis b. shift up 7 units c. shift right 5 units y=? would the answer be: y=sqrt(-x-5)-7
*December 13, 2012*

**calculus**

for the function f(x)=5/x+4, find the average rate of change of f from 1 to x. please show work
*December 13, 2012*

**calculus**

graph the following function using transformations. Be sure to graph all the stages on one graph. state the domain and range. y= -3/x/+1 NOT QUITE SURE HOW TO MAKE THE STRAIGHT UP AND DOWN LINE, INSTEAD OF THIS--/.
*December 12, 2012*

**calculus--please help!!**

given the following piecewise function F(x)={x+11 for -9¡Üx<-3 2 for -3¡Üx¡Ü2 2x-6 for 2<x¡Ü5 {--this symbol is to be around all three of the lines. Find: a. the domain b. the range c. the intercepts d. if f continious on its ...
*December 10, 2012*

**calculus**

find an equation for the line with the given properties. express the equation in slope-intercept form containing the points. P=(-5,4) and Q=(-4,2) plz show work
*December 9, 2012*

**calculus**

find the distanced(p_1&P_2) between points P_1 and P_2. P_1=(4,-5) and P_2=(3,4) plz show work
*December 9, 2012*

**trigonometry**

A 100-foot vertical antenna is on the roof of a building. From a point on the ground, the angle of elevation to the top and the bottom of the antenna are 51 degrees and 37 degrees, respectively. Find the height of the building to the nearest foot. How would you solve for these?
*December 9, 2012*

**calculus-can someone please help me with this ques**

I can get part of the answer then I get stumped. find the center and radius of the circle, Write the standard form of the equation. (4,3)(1,3) to get center: (1+4/2, 3+3/2)=5/2,3 answer:5/2,3 for center radius: then i am stuck
*December 9, 2012*

**college algebra, Please help!!**

a circle has the equation x^2+y^2+6x-6y-46=0 find the center and the radius of the euation. If there are any intercepts list them.
*December 9, 2012*

**college algebra--need help please!!**

write the standard form of the equation and the general form of the equation of the circle with radius r and center (h,k) r=10; (h,k)=(8,-6)
*December 9, 2012*

**calculus**

If (a,-12) is a point on the graph of y=x^2+7x, what is a? please show work
*December 4, 2012*

**calculus**

Plot the points and determine the slope of the line containing them. (-7,-4)(8,-4)
*December 4, 2012*

**trigonometry**

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. Two motorists are driving cars on the highway, both on one side of the plane. If the angle of depression to one car is 34° and to the other is 51°, how far apart are the cars? (Round ...
*December 2, 2012*

**trigonometry**

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. Two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35° and to the other is 55°. How far apart are the cars? (Round ...
*December 2, 2012*

**physics**

A car is designed to get its energy from a rotating flywheel (solid disk) with a radius of 1.00 m and a mass of 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 4,000 rev/min. (a) Find the kinetic ...
*December 2, 2012*

**Statics**

For each of the following, state (using symbols) the null and alternative hypotheses. a. Is the mean IQ of a sample of 60 children significantly below the national average of 100? b. Is the proportion of men in the class more than that expected by chance? c. Does the mean ...
*December 2, 2012*

**Statics**

In a chocolate chip cookie investigation, you decide to compare two cookie sources. Source 1: Mom mails to you a package containing a dozen of her homemade chocolate chip cookies. Source 2: You purchase a dozen of a store brand of chocolate chip cookies at the convenience ...
*December 2, 2012*

**Statics**

You wish to test whether or not a coin is fair, so you toss it 400 times and obtain 220 heads. Test the null hypothesis that the coin is fair and balanced against the alternative that it is not fair and balanced. Use the 1% significance level. Be sure to identify the null and ...
*December 2, 2012*

**Statics**

You suspect that, on the average, professional baseball players are older than professional football players. A random sample of 30 professional baseball players has a mean age of 28.8 years (assume ó = 4). A random sample of 40 professional football players has a mean ...
*December 2, 2012*

**Statics**

An apple grower is trying to produce larger fruit by using a new fertilizer. The usual fertilizer produces fruit with a mean diameter of 8.7 cm. Two new fertilizer brands are under consideration, with the following experimental results: BRAND A: n = 10, mean = 9.5 cm, s = 4 cm...
*December 2, 2012*

**Statics**

Assume that the population is normal. A sample of size 100 is taken. The resultant sample data has a mean of 48 and a standard deviation of 15. Construct the 99% confidence interval for the population mean.
*December 2, 2012*

**Statics**

An automotive engineer wants to use 64 test runs to estimate the true mean tire stopping distance. The standard deviation is assumed to be 32 feet. What is the probability that the error of the estimate will be more than 4 feet?
*December 2, 2012*

**Statics**

17. The Student Health Service assumes, based on historical data, that the height of female students is normally distributed with a standard deviation of 3 inches. The school nurse wants to estimate the average height of this year’s entering female students by examining ...
*December 2, 2012*

**physics**

Two astronauts, each having a mass of 78.5 kg, are connected by a 10.0-m rope of negligible mass. They are isolated in space, moving in circles around the point halfway between them at a speed of 5.50 m/s. Treating the astronauts as particles, calculate each of the following...
*December 1, 2012*

**physics**

A potter's wheel having a radius 0.45 m and a moment of inertia of 14.9 kg · m2 is rotating freely at 49 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and exerting a radially inward force of 72 N. Find the effective ...
*December 1, 2012*

**calculus**

use the given zeros to find the remaining zeros of the function h(x)=x^4-9x^3+12x^2+138x-1360 zero:3-5i enter the remaining zeros of f please show work
*December 1, 2012*

**Statics**

In designing an experiment, a psychologist is willing to assume that the underlying distribution for the time to learn a list of words is approximately normal with a standard deviation of 40 seconds. He wants to be 95% sure that the maximum error of his estimate of the mean ...
*December 1, 2012*

**Statics**

A power company takes a random sample of its delinquent account files. For 400 accounts, the average delinquent amount was $239.30 with a standard deviation of $14.52. With 99% probability, determine the maximum error of the estimate for the mean of all the delinquent accounts.
*December 1, 2012*

**Statics**

A random sample of 100 cans of peaches has an observed mean weight of 48.5 ounces and a standard deviation of 2.4 ounces. Determine the lower limit of the 95% interval for the true mean weight. The can label says that the can weights 48 ounces. Comment on this claim.
*December 1, 2012*

**Statics**

=2.325(3.25/ square root of 100) =75.5625
*December 1, 2012*

**Statics**

A candy machine distributor collects the coins from 100 machines. The standard deviation is $3.25. With probability 98%, what is the maximum error about the true mean that will result?
*December 1, 2012*

**physics**

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 250 N applied to its edge causes the wheel to have an angular acceleration of 1.053 rad/s2. (a) What is the moment of ...
*November 30, 2012*

**Calculus 2**

Thank you soooooooo much!!!!
*November 28, 2012*

**Calculus 2**

The following function has a series of the form the sum from n=0 to infinity of c(subn)x^n. Calculate the coefficients c(subn) and express the power series in summation notation. f(x)=(pi*x)/(pi*x+1) Thank you so much for your help!!!!
*November 28, 2012*

**Calculus 2**

The function ln(x-1) can be expressed as a Taylor Series of the form sum of c(subn)(x-2)^n. Calculate the formlua for c(subn).
*November 28, 2012*

**Calculus 2**

Calculate c(sub0), c(sub1), c(sub2), c(sub3), and c(sub4) for the power series the sum from n=0 to infinity of c(subn)x^n that represents f(x)=tanx. Use the first two nonzero terms of the series to approximate the tangent of 1/4 radian. Compare your approximation with the ...
*November 28, 2012*

**college algebra, Please help!!**

change the exponential expression to an equivalent expression involving a logarithm. 1.9=a^6 a=1.1129 is this the correct logarithmic expression???
*November 27, 2012*

**college algebra, Please help!!**

find the f and g, so that fOg= H H(x)=sqrt x^2+17 please show work
*November 27, 2012*

**college algebra--need help please!!**

find the domain of the composite function fog. f(x)= 2/x-3; g(x)= 7/x please show all work.
*November 24, 2012*

**college algebra--need help please!!**

solve the following exponential equation. use exact answers only. not sure how to put it into the equation but it is 2 then 1-9x where the 1-9x is above the 2=e2x where the 2x is above the 2. Can someone tell me or explain to me how to put this equation the right way here.
*November 24, 2012*

**math**

in the number 288, explain how the value represented by the digit in the tens place is related to the value represented by the digit in the ones place.
*November 24, 2012*

**algebra**

form a polynomial f(x) with real coefficients having the given degree and zeros. Degree 4; zeros:-3 +5i; 2 multiplicity 2 enter the polynomial f(x)=a(?)
*November 20, 2012*

**college algebra--please help**

solve the following inequality 70x-51<70/x I get this--but I do not know how to write the final answer in a solution set 70x-51<70/x 70x^2/x - 51x /x - 70/x < 0 70x^2 - 51x - 70/x <0 (10x + 7) (7x - 10)/x <0 x=0 (10x + 7)= 0 (7x - 10)=0 Can you please help me to...
*November 20, 2012*

**college algebra**

Solve the inequality algebraically 11x-3¡Ý-4x^2
*November 20, 2012*

**college algebra--please help**

Form a polynomial f(x) with real coefficients having the given degree and zeros. degrees 5; zeros 1; -i; 7+i please show all work. I am having a hard time understanding this.
*November 20, 2012*

**college algebra**

find the complete zeros of the polynomial function. write f in factored form. f(x)=x^3-7x^2+25x-39 please show all work. I do not understand this.
*November 20, 2012*

**physics**

A satellite has a mass of 106 kg and is located at 1.96 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? J (b) What is the magnitude of the gravitational force on the satellite? N
*November 14, 2012*

**physics**

A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 34.0 m/s. With what maximum speed can it go around a curve having a radius of 60.0 m?
*November 14, 2012*

**Calculus 2**

thank you so much!
*November 14, 2012*

**Calculus 2**

thank you! we are supossed to use Lopital's rule though. Is there a different way to do it using Lopital's?
*November 14, 2012*

**Calculus 2**

Find the limit as x approaches infinity of (1-(1/(2x)))^(2x).
*November 14, 2012*

**Calculus 2**

integral from 1 to infinity 4/(x^2)(x^2+1)dx
*November 13, 2012*

**Calculus 2**

integral from 0 to infinity of 1/(pi^2+x^2)^(3/2)dx
*November 13, 2012*

**Chemistry**

Describe what is happening in regards to the heat energy, temperature, molecular potential energy, and molecular kinetic energy when water is boiling.
*November 12, 2012*

**Statistics**

male heights are normaly distributed with a mean of 70 and a standard deviation of 2.8 inches. for two randomly selected guys, what's the probability that both of them are 67 inches or shorter? show calculations. Can someone please help me quickly with this question?
*November 8, 2012*

**Calculus 2**

Please help! I just don't know what to put inside the integral!
*November 7, 2012*

**Calculus 2**

The pressure P of a gas is related to its volume V by the formula P=k/V where k is a constant. A quantity of gas with an initial volume of 1 cubic meter and a pressure of 2.5 newtons per square meter expands to a volume of 16 cubic meters. Find the work done by the gas.
*November 7, 2012*

**math**

plug 2x into y. 6x-2x+8 4x+8
*November 7, 2012*

**Finance**

6. You are considering an investment in a one-year government debt security with a yield of 5 percent or a highly liquid corporate debt security with a yield of 6.5 percent. The expected inflation rate for the next year is expected to be 2.5 percent. a. What would be your real...
*November 2, 2012*

**Calculus 2**

the integral from 0 to 1/4 of arcsin(x^(1/2))dx.
*November 2, 2012*

**Chemistry**

If you have 1.80 moles of H2, how many gram of NH3 can be produced?
*October 31, 2012*

**Calculus 2**

Solve the differential equation: dy/dx = y^2 + y
*October 30, 2012*

**Calulus 2**

Solve the differential equation: dy/dx = y^2 + y
*October 30, 2012*

**Algebra**

Suppose you invest $5000 at an annual rate of 4% compounded continuously how much will be in the account after 5 years?
*October 29, 2012*

**Chemistry Lab**

You want to determine the heat generated in a gas-producing reaction. Is this possible? If so, describe the design of such a calorimeter. If not, describe why this cannot be done. Your help is much appreciated!
*October 29, 2012*

**physics**

A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the nitrogen nucleus? (b...
*October 28, 2012*

**physics**

A billiard ball moving at 5.60 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.99 m/s, at an angle of 27.0 with respect to the original line of motion. (Enter the direction with respect to the original line of motion. Include the ...
*October 28, 2012*

**physics**

A railroad car of mass 2.7 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. (a) What is the speed of the three coupled cars after the collision? m/s (b) How much...
*October 27, 2012*

**U.S. History**

Explain the domestic problems confronted by the United States during World War I.
*October 26, 2012*

**Chemistry**

Assuming that the gases are ideal, calculate the amount of work done (in joules) in the following reaction. Is work done on or by the system? A reaction in the Mond process for purfying nickel(0) tetracarbonyl at 50-100 degrees Celsius. Assume one mole of nickel is used and a ...
*October 23, 2012*

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