Wednesday

February 10, 2016
Total # Posts: 539

**math**

Given the cost function, C(x), and the revenue function, R(x), find the number of units x that must be sold to break even. C(x)=86x+3080, R(x)+108x
*January 28, 2016*

**Calculus III**

The surface x^2−y^2=36 can be described using spherical coordinates in the form ρ=g(θ,ϕ)=
*November 30, 2015*

**Calculus III**

Evaluate ∭W f(x,y,z)dV for the function f and region W specified: f(x,y,z) = 18(x+y) W: y≤ z≤x ; 0≤y≤x ; 0≤x≤1 ∭W (18(x+y))dV =
*November 24, 2015*

**Science**

how the volume of air in a tank of compressed air would change if the volume of the tank doubled? My answer was: The volume of the air would increase and it would be more difficult to fit inside of the tank depending on if the tank was filled or not.
*November 17, 2015*

**chemistry**

A viral preparation was inactivated in a chemical bath. The activation process was found to be first order in virus concentration. The beginning of the experiment 2% of the virus was found to be inactivated per minute. [i] Evaluate k for the inactivation process in units (1/s...
*November 11, 2015*

**Physics**

A compact car of mass 915 kg has an overall motor efficiency of 16.0%. (a) If burning one gallon of gasoline supplies 1.34 108 J of energy, find the amount of gasoline used in accelerating the car from rest to 55.0 mi/h. Here you may ignore the effects of air resistance and ...
*October 27, 2015*

**Calculus III**

Compute the length of the curve r(t)=5ti+8tj+(t2+4)k over the interval 0≤t≤6 Hint: use the formula ∫t2+a2‾‾‾‾‾‾‾√dt=12tt2+a2‾‾‾‾‾‾‾√+12a2ln(t+t2+a2‾‾&#...
*October 22, 2015*

**Physics**

Car A and B are facing each other at rest, 100 m apart. Car A accelerates at 5 m/s^2. Car B accelerates at 3 m/s^2. When and where do they meet?
*September 21, 2015*

**geometry**

A circle has a center at (8,2). The point is (3,7) is on the circle. What is the area of the circle, to the nearest tenth of a square unit? A. 22.2 square units B. 44.4 square units C. 157.1 square units D.314.2 square units HELP PLEASE, and thanks.
*September 15, 2015*

**Geometry**

Would it be A then?
*September 15, 2015*

**Geometry**

What is the perimeter of rectangle WXYZ, with vertices W(-3,7), X(-5,4), Y(1,0), and Z(3,3) to the nearest unit. PLEASE HELP. A. 36 UNITS B. 30 UNITS C. 22 UNITS D. 11 UNITS
*September 15, 2015*

**Math**

Which of the following is an asymptote of f(x)=(x^2+3x+2)/(x+2)*tan(pi*x)? A) x=-2 B) x=-1 C) x=1/2 D) x=1 E) x=2 Answer is C but I got A because substituting x for -2 makes the graph undefined.
*September 4, 2015*

**Math**

I believe it's like: y-4=4x+3y y-4=-(9-x) 4x+3y=-(9-x)
*August 29, 2015*

**Math**

y-4=4x+3y=-(9-x) What is the value of xy?
*August 29, 2015*

**Math**

5x/3+y=c 2y=c-4x x+y=6 What is c? I've tried substituting y as x-6 however I'm still not getting it.
*August 29, 2015*

**Math**

Explain how the graph of f(x) = ln x can be used to obtain the graph of g(x) = e^(x-2).
*July 14, 2015*

**Science--HELP!!**

1. Electrons 2. Atomic Model 3. Covalent Bond 4. Chemical bond 5. Either energy level or shell 6. Atomic theory 7. Atomic number Your answers are correct though I'm not sure about number 5.
*June 4, 2015*

**macro**

Assume that the utility function of a consumer is given by U = ln c1 + ln c2 The interest rate is given by 5% and the endowments are given by (y1, y2) = (100, 120). (a) Draw the budget constraint. (b) Calculate the consumption and saving in period 1. (c) Draw the indifference ...
*May 19, 2015*

**Chemistry**

how many grams of Nano3 are in 0.755 moles of nano3
*April 1, 2015*

**7th grade math (probability)**

mark has $186 in his savings account. he withdraws $94, deposits $56,and then withdraws $70.
*March 30, 2015*

**math**

Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?
*March 20, 2015*

**Phyisics**

1. Two concentric conducting spherical shells have radii of 0.126 m. and 0.225 m. The inner sphere bears a charge of -8.00E-08 C. An electron escapes from the inner sphere with negligible speed. Assuming that the region between the spheres is a vacuum, compute the speed (in ...
*March 18, 2015*

**Phyisics**

3. A small sphere whose mass is 8.00E-03 g. carries a charge of 7.00E-08 C. It hangs from a silk thread which makes an angle of 30 degrees with a large charged, nonconducting sheet. Calculate the surface charge density (in coulombs/meter^2) for the sheet.
*March 18, 2015*

**math**

Lexi and Maria had $250 altogether. After Lexi spent25of her money and Maria spent $40, they had the same amount of money left. How much money did Lexi have in the beginning?
*March 12, 2015*

**physics**

a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the car arrive?(hint: both...
*March 10, 2015*

**physics**

4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?
*March 10, 2015*

**algebra**

Can someone explain how he got to this conclusion? I understand he answer and everything, but if you had to show work what would you do?
*February 6, 2015*

**math**

At what value(s) of x does f(x)=(-4x^4)+(2x^2) have a relative maximum?
*February 2, 2015*

**math**

For what values of x is the graph y=2/(5-x) concave upward? x<5 x>-5 x>5 no values of x
*February 2, 2015*

**Physics**

A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earth’s radius is 6.37 × 10^6 m, its mass is 5...
*January 30, 2015*

**Pre-Calc**

Through how many radians does a circle of radius 1 foot rotate if it rolls 10 feet down the road?
*January 16, 2015*

**math**

just answer my question
*January 11, 2015*

**math**

simplify: 6-y/6/1/6-1/y 6-y/6*6y/y-6= 6y/6=y Is this correct help i need help!!
*January 11, 2015*

**math**

thats my middle name
*January 11, 2015*

**math**

simplify: square root (4/3)-square root (3/4) A. 2-sqaure root(3)/2 square root (3) B. square root (7/12) C. square root (3)/6 D. 2/square root (3) which answer? this is what i got square root (16/12)- square root (9/12)= square root (7/12)
*January 11, 2015*

**college pre-calculus**

how do you do it
*January 11, 2015*

**math**

For the curve given by 4x^2+y^2=48+2xy, show that there is a point P with x-coordinate 2 at which the line tangent to the curve at P is horizontal.
*December 31, 2014*

**math**

For the curve given by 4x^2+y^2=48+2xy, find the positive y-coordinate given that the x-coordinate is 2.
*December 31, 2014*

**math**

For the curve given by 4x^2+y^2=48+2xy show that ((dy)/(dx))=(y-4x)/(y-x)
*December 31, 2014*

**Math**

The twice–differentiable function f is defined for all real numbers and satisfies the following conditions: f(0)=3 f′(0)=5 f″(0)=7 a)The function g is given by g(x)=e^ax+f(x) for all real numbers, where a is a constant. Find g ′(0) and g ″(0) in ...
*December 29, 2014*

**Fraction**

13+7 5/8 equals 5/8
*December 8, 2014*

**algebra**

someone know about adding and subtracting denominator
*November 24, 2014*

**algebra**

Perform the indicated operation y/y-5+5/5-y
*November 24, 2014*

**algebra**

Which of the following points lies on the circle whose center is at the origin and whose radius is 10 (-6,4) (/10,/10) (6,-8)
*November 21, 2014*

**algebra**

thank's
*November 21, 2014*

**algebra**

The length of a rectangle is 3 more than twice the width. The area of the rectangle is 119 square inches. What are the dimensions of the rectangle? If x = the width of the rectangle, which of the following equations is used in the process of solving this problem?
*November 21, 2014*

**plz help. math**

alright thank you
*November 21, 2014*

**algerbra**

A triangle has sides of and 3. Which could not be the length of the third side if it is a right triangle? i need help anyone?
*November 21, 2014*

**algebra**

Solve this quadratic equation x^2 + 5x + 3 = 0
*November 21, 2014*

**Science**

"What amount of Barium hydroxide is needed to neutralize 500 kg of 18 molar Sulphuric acid?"
*November 2, 2014*

**Law**

Discuss the power lies within the Parliament in UK and whether the power of parliament had been limited in the present day.
*November 2, 2014*

**Constitutional Law**

Thanks Ms Sue will start off my assignment soon
*November 2, 2014*

**physics**

A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is attached to the near side of...
*October 17, 2014*

**Physics**

Damon, Thank you so much
*October 15, 2014*

**Physics**

A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the horizontal. Ignore any...
*October 15, 2014*

**Physics**

The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?
*October 15, 2014*

**Physics**

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
*October 15, 2014*

**Physics**

A basketball player makes a jump shot. The 0.580-kg ball is released at a height of 1.90 m above the floor with a speed of 7.18 m/s. The ball goes through the net 3.05 m above the floor at a speed of 4.23 m/s. What is the work done on the ball by air resistance, a ...
*October 11, 2014*

**Physics**

ahhh thanks but just a tad late lol, due already
*October 10, 2014*

**Physics**

A camera falls from a blimp that is 399 m above the ground and rising at a speed of 9.75 m/s. Find the maximum height reached by the camera with respect to the ground. The acceleration of gravity is 9.8 m/s^2.Answer in units of m. b)Find the speed at which it hits the ground....
*October 10, 2014*

**Physics**

Buddy is unloading 7kg cans using a 45 degree downward ramp. The ramp was made slippery by the a detergent spill before. Buddy can push the cans off of his truck with an initial velocity of .2 m/s and it moves as 1.2 m/a by the time it reaches the lowest point on the ramp. The...
*October 7, 2014*

**Physics **

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*October 3, 2014*

**Physics **

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*October 3, 2014*

**PHYSICS**

Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while it's pushing off?
*October 3, 2014*

**PHYSICS**

nvm I solved it
*October 3, 2014*

**PHYSICS**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*October 3, 2014*

**Physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*October 3, 2014*

**Physics**

A 36-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 185 J from 460 J. How high does she rise during this interval? Neglect air resistance.
*October 3, 2014*

**Physics**

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*October 3, 2014*

**College algebra**

There were 40,000 people at a ball game in Los Angeles. The days receipts were 298,000. How many people paid $12.00 for reserved seats and how many paid $5.00 for general admission?
*October 1, 2014*

**Reading/language arts**

help
*September 27, 2014*

**Reading/language arts**

Write a sentence for the given topic, using a form of one of the following linking verbs in each sentence: smell, sound, feel, taste, grow. Use at least one predicate noun or predicate adjective in each sentence. 1) (dificulty or ease of writing) can you please help me by ...
*September 27, 2014*

**US History**

truck drivers
*September 27, 2014*

**Physics**

Consider two spherical stones with same density (mass per unit volume). The larger stone has radius R = 8.58 cm and the smaller stone has radius r = 3.37 cm. Find the ratio of the terminal speed in air of the larger stone to that of the smaller stone.
*September 25, 2014*

**Physics**

13.36 m/s^2
*September 25, 2014*

**Physics **

Air rushing over the wings of high-performance race cars generates unwanted horizontal air resistance but also causes a vertical downforce, which helps the cars hug the track more securely. The coefficient of static friction between the track and the tires of a 650-kg race car...
*September 25, 2014*

**Physics**

Vx=Ux+at Vx=16.1-(.65*9.81)(1.2) Vx=8.4482
*September 25, 2014*

**Physics **

Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.20 s have elapsed? Ignore the effects of ...
*September 25, 2014*

**math**

using comparative thinking which equations are true a.50+64=62+48 b.50+64=62+62 c.50+64=124+52 d.50+64=66+52
*September 24, 2014*

**PHYSICS **

The weight of an object is the same on two different planets. The mass of planet A is only thirty-five percent that of planet B. Find the ratio rA/rB of the radii of the planets.
*September 20, 2014*

**Physics **

An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +5.06 105 m/s to a final velocity of +2.03 106 m/s while traveling a distance of 0.034 m. The electron'...
*September 20, 2014*

**physics **

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.850 m/s at an angle of 34.3° above the table, and it lands on the magazine 0.0780 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
*September 13, 2014*

**Physics **

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.53 m. The stones are thrown with the same speed of 8.62 m/s. Find the location (above the base of the ...
*September 13, 2014*

**Physics**

How long is Mayra, a ballerina, in the air when she leaps striaght up with a speed of 1.23 m/s?
*September 11, 2014*

**US Government**

What regulates the electronic media, except the Internet?
*July 9, 2014*

**MAT 222**

-10 < -2 + 8x < 22 compound inequalities
*June 23, 2014*

**Chemistry**

how many moles of oxygen are needed to react with 3.5 moles of isopropyl alcohol, C3H7OH
*June 5, 2014*

**Multiple Choice**

Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to flow past a fixed point? (Points : 1) 2.0 s 5.6 s...
*May 8, 2014*

**science**

The amplitude is given in the equation = .30
*May 1, 2014*

**math**

write and solve an equation to find the missing dimension of the rectangular prism. Volume= 1km cubic L=3/4 km W=2/3 km H= ?
*April 28, 2014*

**Biology**

your welcome
*April 28, 2014*

**Biology**

yes its hard to pick between b and d.
*April 28, 2014*

**Math**

0.30 rounded
*April 28, 2014*

**Math**

7x7x2=28 cubic inches
*April 28, 2014*

**Math **

A calendar that has one page per day is 7 inches long, 7 inches wide, and 2 inches high. What is the volume of one page of the calendar? Round your answer to the nearest thousandth.
*April 28, 2014*

**Math**

help MS.SUE
*April 28, 2014*

**Math**

what happens to the volume of a rectangle if you multiply the length, the width, and the height by 2?
*April 28, 2014*

**Math**

HELP!!!!!!!!!!!!!!!!!!
*April 28, 2014*

**Math**

What happens to the volume of a rectangular prism length, the width, and the height by 2?
*April 28, 2014*