Sunday

August 2, 2015

August 2, 2015

**Pre-Calculus/Trignometry**

Give an example of a function whose domain is [2,infinity).
*Monday, September 29, 2014 by Anonymous*

**Calculus**

r=log(cos^2(4theta)) what is the derivative of this?
*Monday, September 29, 2014 by Anonymous*

**Calculus**

What is the derivative of y=2^x?
*Sunday, September 28, 2014 by Anonymous*

**CALCULUS**

I need to find the unit normal vector given: r(t)= ti + (6/t) j where t= 3 I know I need to find the unit tangent vector first, which is r'(t) divided by the magnitude of r'(t). r(t) can be rewritten as ti+ 6t^-1 r'(t) = i- 6t^-2 = i- [6/ (t^2)] j For the magnitude...
*Sunday, September 28, 2014 by Dia*

**Calculus Minima Problems**

A small island is 2 km off shore in a large lake .A woman on the island can row her boat 10 km/hr and can run at a speed of 20 km/hr. If she rows to the closest point of the straight shore, she will land 6 km from a village on the shore. Where should she land to reach the ...
*Sunday, September 28, 2014 by Mike*

**Calculus Maxima/Minima**

An automobile traveling at the rate of 30 ft/sec is approaching an intersection. When the automobile is 120 ft. from the intersection, a truck, traveling at the rate of 40 ft/sec on a road at right angles with the automobile’s road crosses the intersection. How long after...
*Sunday, September 28, 2014 by Mike*

**Calculus**

A small island is 2 km off shore in a large lake .A woman on the island can row her boat 10 km/hr and can run at a speed of 20 km/hr. If she rows to the closest point of the straight shore, she will land 6 km from a village on the shore. Where should she land to reach the ...
*Sunday, September 28, 2014 by Mike*

**Pre-Calculus**

1.) Find (f - g)(x) if f(x) = 2x - 5 and g(x) = 4. 2.) Given f(x) = 4 and g(x) = 2x - 1, find (f - g)(x). Thanks so much! :)
*Sunday, September 28, 2014 by Susie*

**Calculus**

Hello, my question is the following: The derivative of f(x) = ln(x) is given by f'(x) = 1/x. Find an equation of the tangent line to the graph y = ln(x) that passes through the point (0,0). So if I go through this using the typical method I use I have the point slope ...
*Saturday, September 27, 2014 by Joshua*

**Calculus**

2. The slope of the tangent line to the graph of the exponential function y=2^x at the point (0,1) is the limit of (2^x-1)/x as x approaches 0. Estimate the slope to three decimal places. My work: (-1,0.5) (-0.5,0.586) (-0.9,0.516) (-0.999,0.5) (0,empty) (0.0001, 0.693) (0.001...
*Friday, September 26, 2014 by Anonymous*

**Calculus**

1. Evaluate the function at the given numbers (correct to six decimals places). Use the results to guess the value of the limit,or explain why it does not exist. F(t)=( t^(1/3) - 1)/(t^(1/2) - 1) ; t= 1.5,1.2,1.1,1.01,1.001; The limit of F(t) as t approaches 1. My work: t=1....
*Friday, September 26, 2014 by Anonymous*

**Pre-Calculus**

Help please If f(x)=8x and g(x)=2x+1 find (fog)(x) 16x^2+8x 16x+1 16x+8 10x+1
*Friday, September 26, 2014 by Anonymous*

**Pre-Calculus**

Help Please Solve the following system of equations. Round your answers to the nearest tenth. Your answer will be in the form: (M,N). Find M + N, rounded to the nearest tenth. 5x+2y=7 -2x+6y=9
*Friday, September 26, 2014 by Anonymous*

**Pre-Calculus**

Hello! I need help with these 2 questions: 1.) Describe how the graphs of f(x) = |2x| and g(x) = -|2x| are related. a.) All of these. b.) The graph of g(x) is a reflection of the graph of f(x) over the y-axis. c.) Non of these. d.) The graph of g(x) is a reflection of the ...
*Friday, September 26, 2014 by Paris*

**Calculus**

A man standing 9 feet from the base of a lamppost casts a shadow 6 feet long. If the man is 6 feet tall and walks away from the lamppost at a speed of 30 feet per minute, at what rate, in feet per minute, will his shadow lengthen?
*Thursday, September 25, 2014 by Mike Nguyen*

**calculus 1**

a ladder 20 ft. long rests against a vertical wall.If the bottom of a ladder slides away from the wall at a rate of 4 ft./sec, how fast is the top of the ladder sliding down the wall when the bottom of the ladder is 12 ft. from the wall? x^2 +y^2 = 20^2 x^2 + y^2 = 400 ...
*Thursday, September 25, 2014 by hasel*

**Calculus **

I am so lost, I have no idea what to do next. Find the equation of the tangent line to the graph at the indicated point f(x) =x^2 +x ; a=-1 I started out using f(-1)= (-1+h)-(-1)/h but i am so lost on what to do next. I have tried to look at examples in the book, but i do not ...
*Thursday, September 25, 2014 by Erin*

**Calculus**

It is known that the quantity demanded of a certain make of portable hair dryer is x hundred units/week and the corresponding wholesale price is shown below where p is in dollars. p = sqrt(225 - 5x) The supplier will make x hundred units of hair dryers available in the market ...
*Thursday, September 25, 2014 by Andre*

**Calculus **

The following table shows the percentage of the U.S. Discretionary Budget allocated to education in 2003, 2005, and 2009 (t=0 represents 2000) Year t 3 5 9 Percentage p(t) 6.8 7 6.2 (a) Compute and interpret the average rate of change of P(t) (b) Over the period 2003-2009 (...
*Wednesday, September 24, 2014 by Ellen*

**Math-calculus**

At a certain point on the beach, a post sticks out of the sand, it's top being 76 cm above the beach. The depth of the water at the post varies sinusoidally with time due to the motion of the tides. The depth d is modeled by the equation d=40+60cos(PI/2(t-2)) where t is ...
*Wednesday, September 24, 2014 by Matt*

**Calculus**

At what point does the normal to y=-5-1x+3x^2 at (1, -3 ) intersect the parabola a second time? Answer: Note: You should enter a cartesian coordinate. The normal line is perpendicular to the tangent line. If two lines are perpendicular their slopes are negative reciprocals -- ...
*Wednesday, September 24, 2014 by Megan*

**Pre-Calculus**

Help please Find the equation, in standard form, of the line passing through the points (2,-3) and (4,2). 5x-2y=16 y=5/2x+8 5x+2y=16 2x-3y=9
*Wednesday, September 24, 2014 by Anonymous*

**Pre-Calculus**

Help please What is the slope of the line x = 4? would it be undefined??
*Wednesday, September 24, 2014 by Anonymous*

**Pre-Calculus**

Help please, am i correct? The border line of the linear inequality 4x-2y < 1 is solid. True False <--
*Wednesday, September 24, 2014 by Anonymous*

**Pre-Calculus**

help please Identify the slope and intercept of the following linear equation. y=3/7x-5 Slope: 3/7; intercept: 5 Slope: -5; intercept: 3/7 Slope: 5; intercept: 3/7 Slope: 3/7; intercept: -5
*Wednesday, September 24, 2014 by Anonymous*

**calculus**

Z=square root of(x^2+y^2) + xy Find the partial derivatives: x, xx, y, yy, xy. Thanks.
*Wednesday, September 24, 2014 by jean*

**Pre-Calculus**

help please in what form is the following linear equation written: 3x-2y=4 Slope-intercept Point-slope Standard Rise-run
*Wednesday, September 24, 2014 by Anonymous*

**Calculus I**

Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given by T(t)= 4t + 10, 0<...
*Wednesday, September 24, 2014 by Anonymous*

**calculus**

Find the interval [a, b] on which the function f(x) = 2 x3+3 x2−12 x+3 is decreasing. Enter your answer as: [a, b] for some constants a, b.
*Wednesday, September 24, 2014 by Anonymous*

**calculus**

Find the derivative of (6x^2+4y^2)/(3x+7y)=3 using implicit and quotients rule. Thank you!
*Tuesday, September 23, 2014 by MathLover*

**Calculus**

A sinusoidal section is to be built as part of a roller coaster track. The high point is h=27 m at a horizontal distance d=0 m. It has a low point at h=-3 m at d=50 m. a. Write an equation expressing h in terms of d. b. The lengths of the horizontal timbers used to build the ...
*Tuesday, September 23, 2014 by Nick*

**Calculus**

Scorpion Gulch and Western Railway are preparing to build a new line through Rolling Mountains. They have hired you to do some calculations for tunnels and bridges needed on the line. You set up a Cartesian coordinate system with its origin at the entrance to the tunnel ...
*Tuesday, September 23, 2014 by Nick*

**calculus**

Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given by T(t)= 4t + 10, 0<...
*Tuesday, September 23, 2014 by Anonymous*

**calculus**

Suppose that the number of bacteria in a plate of food is given by N(T)= 10T^2 - 40T + 200, -1<=T<=20 where T is the temperature of the food in degrees Celsius. Suppose that the temperature of the food when it is left out on a picnic table is given by T(t)= 4t + 10, 0<...
*Tuesday, September 23, 2014 by Anonymous*

**Calculus**

A spacecraft is in an elliptical orbit around the earth. At the time t=0 hours, it is at its apogee (highest point), d=1000 km above the earth's surface. It is at its perigee (lowest point) d=100 km above the surface 50 minutes later. a. Assuming that d varies sinusoidally...
*Tuesday, September 23, 2014 by Nick*

**Pre-calculus/Trignometry**

Which of the following is a correct equation for the line passing through the point (-1,4) and having slope m = -3? A. y-4=-3(x+1) B. y=-3x+1 C. 3x+y=1 D. y=-1/4x-3
*Tuesday, September 23, 2014 by Anonymous*

**Calculus I**

I have to determine if this function is either odd or even or neither. f(x)=x^3*abs(x^3) + x^3 I do not know how to approach this question as the absolute value is giving me trouble. Please help. Thanks.
*Tuesday, September 23, 2014 by Anonymous*

**College Pre-Calculus**

find a function m such that m(f) is the number of miles in f feet
*Tuesday, September 23, 2014 by Anonymous*

**Calculus**

At a certain point on the beach, a post sticks out of the sand, its top being 76 cm above the beach. The depth of the water at the post varies sinusoidally with time due to the motion of the tides. The depth d is modeled by the equation d=40+60cos(pi/6(t-2)) where t is the ...
*Monday, September 22, 2014 by Nick*

**AP Calculus BC**

A giant soda glass is formed by rotating the graph of f(x)= .03x^2+1.125, 0<=x<5 f(x)= -.2(x-5)^2+1.875, 5<=x<6 f(x).1(x-6)^2+1.675, 6<=x<=7 about the x axis a) If the measurements are in inches, find the capacity of the glass in cubic inches B) If 16.3787 cm...
*Monday, September 22, 2014 by Zaina*

**calculus**

Q: Suppose that for all xE(0,5), f(x) is between 1+x and 3+sin((pi)(x)). Find lim x->2 f(x). Is this question related to the intermediate value theorem? It is confusing me, can anyone help out? I am not certain of what xE(0,5) is defining, is that a set of x values or am I ...
*Sunday, September 21, 2014 by Josh*

**pre calculus**

Use a calculator to find the approximate value of sin-1( 0.635).
*Saturday, September 20, 2014 by math*

**Calculus**

To estimate the height of a building, a stone is dropped from the top of the building into a pool of water at ground level. How high is the building if the splash is seen 6.7 seconds after the stone is dropped? Use the position function for free-falling objects given below. (...
*Friday, September 19, 2014 by Zoey*

**Pre-Calculus Questions**

Hi! Can someone help me with these? Thanks! 1.) Determine the slope and the y-intercept of the equation of the line passing through the points (-5, 3) and (1, -3). Write the equation of the line in slope intercept form. 2.) Determine the x- and y- intercepts and use them to ...
*Friday, September 19, 2014 by Lanie*

**Pre-Calculus**

Hi! I need help with these two. Here's the link for both pictures. 1.) Determine the intervals over which the function is increasing, decreasing, or constant. Write your answer in interval notation. Link for photo: file:///C:/Users/Cynthia/Downloads/Save.PNG 2.) ...
*Friday, September 19, 2014 by Faith*

**calculus**

Summarize all the pertinent information obtained by applying the final version of the graphing strategy Curve-sketching techniques to f,and sketch the graph of f. f(x)=(x-1)^3(x+3)
*Friday, September 19, 2014 by maribel*

**calculus**

f(x)=8x^3-2x^4 and sketch a graph of f.
*Friday, September 19, 2014 by maribel*

**calculus**

How to find the x and y coordination of all inflection points? f(x) = x^4- 12x^2?
*Friday, September 19, 2014 by maribel*

**Math (Pre-Calculus)**

Can someone help me with this? Thanks! Find the zeros of the function algebraically. f(x)=x^2-8x+15 ---------------- 10x
*Thursday, September 18, 2014 by Ben*

**Pre-Calculus**

1.) Which equation represents a function? A. y=-2x+1 B. x=y^2-1 C. y^2=1/3x D. None Of These E. x=4 2.) The zeros of a function f are the x-values for which f(x) = 0. True or False?
*Thursday, September 18, 2014 by Sofia*

**math calculus 3**

find a formula for a function g( x,y,z) whose level surfaces are planes parallel to z=3x-2y+7
*Thursday, September 18, 2014 by annaloris*

**Calculus **

Calculate the average rate of change of the given function f over the intervals [a, a+h] where h=1, 0.1, 0.01, 0.001, and 0.0001. I have no clue how to do this. Any help would be appreciated. Thanks I know I use the formula f=f (a+h) - f (a)/h Then do I need to plug in the -2x...
*Tuesday, September 16, 2014 by John*

**Pre-Calculus**

Hi! I'm having trouble with this math question; can someone help? Thanks! :) Given the function f(x)=x^2+9, solve. a.) Find f(-3) b.) Find f(x-2)
*Tuesday, September 16, 2014 by Tiffany*

**Calculus I**

Suppose we have a metal bar of length L0 metres at temperature T0 in degrees Celsius.When the bar is heated or cooled, the length of the bar changes. The amount that the length changes is proportional to the product of the temperature change and the original length of the bar ...
*Tuesday, September 16, 2014 by Anonymous*

**Calculus**

I do not understand what this question is asking and how to get the result for it: "Suppose we have a metal bar of length L0 metres at temperature T0 in degrees Celsius.When the bar is heated or cooled, the length of the bar changes. The amount that the length changes is ...
*Tuesday, September 16, 2014 by Anonymous*

**Pre-Calculus/Trigonometry**

Help please Which of the following is the equation of a line that passes through the points (2,5) and (4,3)? y = -x + 7 y = x + 7 y = 2x + 5 y = -2x + 5
*Tuesday, September 16, 2014 by Anonymous*

**differential calculus**

a SECURITY CAMERA is centered 50 feet above a 100-foot hallway. it is easiest to design the camera with a constant angular rate of rotation, but this results in a variable rate at which the images of the surveillance area are recorded. so, it is desirable to design a system ...
*Tuesday, September 16, 2014 by =)*

**differetial calculus-related rates**

LINEAR VS ANGULAR SPEED A wheel of a radius 30 centimeters revolves at a rate of 10 revolutions per second.A dot is painted at a point P on the rim of the wheel. a)find dx/dt as a function of ϴ. b)use a graphing utility to graph a function in part (a) c)when is the ...
*Tuesday, September 16, 2014 by =)*

**differential calculus**

ANGLE OF ELEVATION A balloon rises at a rate of 4 meters per second from a point on the ground 50 meters from an observer.Find the rate of change of the angle of elevation of the balloon from the observer when the balloon is 50 meters above the ground. please show all ...
*Tuesday, September 16, 2014 by =)*

**differential calculus**

ADIABATIC EXPANSION when a certain polyatomic gas undergoes adiabatic expansion,its pressure p and volume V satisfy the equation pV^1.3 =k,where k is constant.Find the relationship between the related rates dp/dt and dV/dt. this is a problem of related rates please show all ...
*Tuesday, September 16, 2014 by =)*

**Calculus **

find an equation of the tangent line to the graph of the function f through the point (xsub0, ysub0) not on the graph. TO find the point of tangency (x,y) on the graph of f, solve the equation ....
*Tuesday, September 16, 2014 by Anonymous*

**Calculus-Math**

The ordering and transportation cost C for components used in a manufacturing process is approximated by the function below, where C is measured in thousands of dollars and x is the order size in hundreds. C(x) = 12((1/x)+((x)/(x+3))) (a) Verify that C(2) = C(15). C(2) = 54/5 ...
*Monday, September 15, 2014 by Karen*

**pre-calculus**

At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
*Monday, September 15, 2014 by Anonymous*

**Pre-Calculus/Trigonometry**

Am I right? Which of the following is the equation of a line that passes through the point (3,2) and is parallel to the y-axis? y = 3 x = 2 y = 2 x = 3 <---
*Monday, September 15, 2014 by Anonymous*

**Pre-Calculus/Trigonometry**

Help please What is the slope of the line that passes through (1,0) and is parallel to y = 3x + 5?
*Monday, September 15, 2014 by Anonymous*

**calculus**

Can you help me solve this problem? I really don't know what to do. I solve problems like for example the rate of change of the elevation but I just encountered this kind of problem so I really don't know what to do. Please help me The endpoints of a movable rod of ...
*Monday, September 15, 2014 by y*

**Pre Calculus **

A motorboat travels 48 miles down a river in the same time it takes to travel 32 miles up the river. If the rate of the current is 4 miles per hour that is the rate of the boat still water?
*Monday, September 15, 2014 by Jody*

**AP Calculus**

Find an equation of all tangent lines for the curve x^2-xy+y^2=16 x=-2 2x-(xy'+y(1))+2yy'=0 2x-xy'+y+2yy'=0 y'(-x+2y)=-2x-y y'=-2x-y/-x+2y y'=-2(0)-y/-(0)+2y y'=-y/2y Not sure what to do now?
*Sunday, September 14, 2014 by Selena*

**Pre-Calculus**

Find all the rational zeros of the polynomial, and then find the irrational zeros P(x)= 2x^4+15x^3+31x^2+20x+4
*Sunday, September 14, 2014 by Drue*

**Pre-Calculus**

Find a polynomial with integer coefficients that satisfies the given conditions. P has degree 2 and zeros 2 + i and 2 − i.
*Sunday, September 14, 2014 by Drue*

**Pre-Calculus**

Two polynomials P and D are given. Use either synthetic or long division to divide P(x) by D(x),and express the quotient P(x)/D(x) in the form P(x)D(x) = Q(x)+ R(x)D(x) . P(x) = 6x^4 − 3x^3 + 29x^2, D(x) = 3x^2 + 13
*Sunday, September 14, 2014 by Jose*

**Pre-Calculus**

Find all the real zeros of the polynomial. Use the quadratic formula if necessary. 4x^3 − 10x^2 + 9
*Sunday, September 14, 2014 by Jessica*

**Pre-Calculus**

Two polynomials P and D are given. Use either synthetic or long division to divide P(x) by D(x),and express the quotient P(x)/D(x) in the form P(x)D(x) = Q(x)+ R(x)D(x) . P(x) = 6x4 − 3x3 + 29x2, D(x) = 3x2 + 13
*Sunday, September 14, 2014 by Jose*

**Pre-Calculus**

Find all solutions of the equation and express them in the form a + bi. 36x^2 − 12x + 2 = 0
*Sunday, September 14, 2014 by Christian*

**Pre-Calculus**

I'm kind of stuck on how to do this. Can someone help me? Thanks! Write the equation of the line with slope -2 that passes through the point (-1, -3) in slope-intercept form.
*Sunday, September 14, 2014 by Robert*

**math**

The farmer wants to use the 500 m to an enclosure divided into two equal areas, What is the total maximum area that can is achieved with the 500 m fence. using differential calculus to the solution.
*Sunday, September 14, 2014 by gordana*

**Pre-Calculus**

Hello! I wanted to know if my answers are right or not? Thanks! :) 1.) Segments AB and CD have the following endpoints. Determine whether the segments are parallel, perpendicular or neither. A (3, 0), B (-2, 2), C (-1, 4), D (-3, -1) My answer: Parallel 2.) Segments AB and CD ...
*Sunday, September 14, 2014 by Abby*

**Pre-Calculus**

Find all zeros of the polynomial P(x)=x^3-x-6
*Sunday, September 14, 2014 by Christian*

**Pre-Calculus**

Factor the polynomial completely, and find all its zeros. State the multiplicity of each zero P(x)= x^3-x^2+x
*Sunday, September 14, 2014 by Adrian*

**Pre-Calculus**

Find all solutions of the equation and express them in the form a+bi 2x^2+3=2x
*Sunday, September 14, 2014 by Jake*

**Pre-Calculus**

Find all rational zeros of the polynomial, and write the polynomial in factored form? P(x)= 2x^3-3x^2-2x+3
*Sunday, September 14, 2014 by Monica*

**Pre-Calculus**

Find a polynomial of degree 4 that has a integer coefficients and zeros 1,-1,2 and 1/2 (one half)?
*Sunday, September 14, 2014 by Andrea*

**Pre-Calculus**

Hello! I wanted to know if my answers are right or not? Thanks! :) 1.) Segments AB and CD have the following endpoints. Determine whether the segments are parallel, perpendicular or neither. A (3, 0), B (-2, 2), C (-1, 4), D (-3, -1) My answer: Parallel 2.) Segments AB and CD ...
*Saturday, September 13, 2014 by Abby *

**Pre-Calculus**

Hi! I have three questions that I need checked over just to make sure I understand it. Thanks! :) 1.) What is the slope of the line that passes through (5, 8) and (-2, 6)? My answer: -2/7 2.) If Segment AB || Segment CD and the slope of Segment AB = 1/2, what is the slope of ...
*Saturday, September 13, 2014 by Abby*

**Pre-Calculus/Trigonmetry**

Write the equation of the line that is parallel to the x-axis and goes through the point (1,4).
*Friday, September 12, 2014 by Anonymous*

**Pre-Calculus**

Hello! Can someone check and see if these answers are correct? Thanks! 1.) If a line with slope of 1/2 is perpendicular to another line, then the slope of the other line is -2. TRUE or FALSE? (I choose True) 2.) If Segment QR || Segment TU and the slope of Segment TU is -3, ...
*Friday, September 12, 2014 by Lee*

**Pre-Calculus/Trigonometry**

Help please Tracy has a cell phone plan that provides 250 free minutes each month for a flat rate of $29. For any minutes over 250, Tracy is charged $0.35 per minute. Which of the following piecewise functions represents charges based on Tracy's cell phone plan? A. f(x)={...
*Friday, September 12, 2014 by Anonymous*

**Calculus II**

find the distance between the given parallel planes 5x-5y+z=10 and 10x-10y+2z=2. I got 9sqrt51/51
*Thursday, September 11, 2014 by Mitch*

**Math: pre calculus**

a barn is 150 feet long and 75 feet wide. the owner has 240 ft of fencing and wants to construct two adjacent outdoor pens of identical size along the long side of the barn using the barn as one side of each pen. the owner wants the pens as large as possible. what are the ...
*Thursday, September 11, 2014 by crisly*

**pre calculus **

Determine the quadratic function in vertex form (A) vertex at (-3,-10) passing through the point (2,-5) Dow do I figure it out?
*Wednesday, September 10, 2014 by Ayane*

**maths-calculus**

find the limit as x approaches infinity, -(x+1) (e^(1/(x+1))-1)
*Wednesday, September 10, 2014 by bel*

**Pre-Calculus**

Hi! I need help with this math homework question: If you had a triangle that has the vertices (-2, 1), (0, -5), and (1. 2) and you had to shift that triangle 5 units left and 4 units down, how would you find the vertices of the shifted triangle?
*Tuesday, September 9, 2014 by Kali*

**Pre-Calculus/Trigonometry**

Help Me, Please Here is a table of values for y = f(x). x: 0, 5, 10, 15, 20, 25, 30, 35, 40 f(x): 5, 6, 7,8, 9, 10, 11, 12, 13 Mark the statements that are true. A. f(5) = 6 B. The domain for f(x) is the set {5, 6, 7, 8, 10, 11, 12, 13}. C. The range for f(x) is all real ...
*Tuesday, September 9, 2014 by Anonymous*

**Pre-Calculus/Trigonometry**

Help please If, f(x)= 3/x+2 -√x-3, complete the following statement. Round your answer to the nearest hundredths place. F(7)= ?
*Tuesday, September 9, 2014 by Haila*

**calculus**

Highway engineers often use quadratic functions to model safe stopping distances for cars like 1/2x quantity squared + 11/5x is used to model the safe stopping distance for car traveling at x miles per hour on dry, level pavement. If a driver can see only 200 feet ahead on a ...
*Tuesday, September 9, 2014 by ANON :)*

**Calculus**

Determine the exact values of the six trigonometric functions of the angle.(-5,-2)
*Monday, September 8, 2014 by Ashley *

**Calculus**

"Three hundred books sell for $40 each, resulting in a revenue of $12,000. For each $5 increase in price, 25 fewer books are sold. Write revenue R as a function of the number x of $5 increases." How would you get this problem started?
*Monday, September 8, 2014 by Lynn*

**Pre-Calculus/Trigonometry**

Help me please, just explain. How would I find f(1)? f(1)= x; -3, -2, -1, 0, 1, 2 f(x); 3.4, 0, -1.2, 0.4, 1.3, 1.7
*Monday, September 8, 2014 by Haila*

**Calculus**

Suppose the area under the curve y=xe^(-mx) from 0 to 1 is 0.4. Find m.
*Monday, September 8, 2014 by Ryan*

**calculus **

Verify Clairaut's theorem for u=ln(x^(2)-y^(2)).
*Monday, September 8, 2014 by Shawn*