Sunday

March 29, 2015

March 29, 2015

Total # Posts: 6,553

**Precalculus**

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t and y=-50 + 30 ...
*March 2, 2014*

**Precalculus**

That's wrong :( It's not 2pi/3 or pi
*March 2, 2014*

**Precalculus**

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
*March 2, 2014*

**Precalculus**

-9 is incorrect, sorry. The answer is also not 6 or -6
*March 2, 2014*

**Precalculus**

Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.
*March 2, 2014*

**Precalculus**

Find the sum of all possible values of the constant k such that the graph of the parametric equations x=2+4cos(s) and y=k-4sin(s) intersects the graph of the parametric equations x=1+cos(t) and y=-3+sin(t) at only one point.
*February 28, 2014*

**Precalculus**

Let G be the graph of the parametric equations x=cos(4t)and y=sin(6t). What is the length of the smallest interval I such that the graph of these equations for all t in I produces the entire graph G?
*February 28, 2014*

**Precalculus**

A lattice point is a point with integer coordinates. How many lattice points (x,y) with -100 less than or equal to x less than or equal to 100 and -100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=30-40 cos t y=-50 + 30 cos t ?
*February 28, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
*February 27, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
*February 27, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
*February 26, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
*February 26, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
*February 26, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
*February 26, 2014*

**Chemistry**

When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...
*February 25, 2014*

**Finance**

i don't know
*February 25, 2014*

**Math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
*February 25, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
*February 25, 2014*

**math**

mollly uses 192 beads to make a necklace and a bracelet. it takes 5 times as many beads to make a necklace than it does to make a bracelet. How many beads are used to make the necklace?
*February 25, 2014*

**english**

1.Virtual reality systems can be used to train pilots, doctors, and engineers. These systems are seen most often in video games. 2. a head-mounted display is made of a headset with a screen for each eye. the display connects to a computer. 3. a tracking device senses the eye ...
*February 25, 2014*

**Math**

John is designing a redwood deck. each board is 5 1/2 inches wide, and each will be placed parallel to one another. Should he use 3/16 inch, 1/4 inch, or 3/8 inch spacing between boards if he wants the deck to be as close as possible to, but not greater than, 18 fet wide? How ...
*February 25, 2014*

**Math**

A carousel at Playland, contains 38 horses. each carousel ride takes 4 minutes, riders need 3 minutes to exit and newcomber require 3 minutes to pick a horse and hop on. A carousel ride costs $0.75. The carousel makes $88,239.00 a year. How many horses are occupied per ride, ...
*February 25, 2014*

**Math**

What is the maximum number of intersections that can be formed by n lines?
*February 25, 2014*

**math**

Another variety of R&Ns has a different set of magical (yet mathematical) properties. Remove exactly 4 candies and 1 additional candy appears in the bag. According to the package, a bag contains 50 candies. What is the maximum number of canies that this variety of R&Ns will ...
*February 25, 2014*

**Math**

R&N is a new candy with magical (yet mathematical) properties. Not all candies are the same size. When removing the largest R&N from a new bag, the bag becomes 1/2 full; removing the second largest makes the bg 1/3 full; removing the third largest makes it 1/4 full, and so on...
*February 25, 2014*

**Precalculus**

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special ...
*February 24, 2014*

**calculus**

h(t)=tan theta (5pie/3,3pie) graph the function on the given interval
*February 24, 2014*

**6th grade social studies**

The second answer is:India.
*February 24, 2014*

**Chemistry**

A gas at 54◦C occupies 4.54 L. At what tem- perature will the volume be 3.04 L, assuming the same pressure?
*February 23, 2014*

**chemistry**

A sample of helium gas has a volume of 328 mL at 0.69 atm. What pressure is needed to reduce the volume at constant temperature to 32 mL?
*February 23, 2014*

**mat/116**

WHATS THE EQUATION FOR THAT PROBLEM
*February 23, 2014*

**Physics**

You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...
*February 22, 2014*

**Pre-Calc**

One side of the barn counts as an enclosure.
*February 19, 2014*

**Pre-Calc**

A farmer is making a pig pen next to the barn. He has enough materials to build 50 feet of fencing. a)what is the largest area he can fence in? b)what are the dimensions of the pen with the largest area?
*February 19, 2014*

**Math**

Use the Rational Zeros Theorem to write a list of all possible rational zeros of the function. -2x^4+4x^3+3x^2+18
*February 18, 2014*

**math**

1-tan^2 theta/1+tan^2 theta + 2sin^2 theta need to simply to sin and cos
*February 17, 2014*

**Problem solving**

30
*February 17, 2014*

**Chemistry**

So (650)(25)/248=353(x)/298 65.5241=.8441/(x) 55.3=x got it right thanks Dr.Bob
*February 15, 2014*

**Chemistry **

If a sample of gas occupies 25.0 mL at -25°C and 650 mmHg, what is the volume at 25°C and 353 mmHg? (Could you please show me step by step?)
*February 15, 2014*

**Physics**

sin^-1(y/x)
*February 15, 2014*

**Physics**

Calculate the gravitational force between the Sun and Saturn. The mass of the Sun is 1.99×1030 kg. The mass of Saturn is 5680×1023 kg. The distance between them is 143×1010 m. In Newtons
*February 13, 2014*

**Math**

I have $35,000 in holding since 1997 earning an interest rate of 3%. How much is this worth today in $
*February 13, 2014*

**strayer university**

The Lo Company earned $ 2.60 per share and paid a dividend of $ 1.30 per share in the year just ended. Earnings and dividends per share are expected to grow at a rate of 5 percent per year in the future. Determine the value of the stock: A. if the required rate of return is 12...
*February 13, 2014*

**chemistry**

2 nacl (aq) + h2so4 ==> na2so4 (aq) + 2 hci (g)
*February 13, 2014*

**physics**

if the capacitance meter applies a voltage of 3.0 V across the plates and reads a capacitance of 30 pF, what is the charge on the plates?
*February 13, 2014*

**physics**

A projectile is fired into the air from the top of a cliff of height h = 208 m above a valley. Its initial velocity is v0 = 55.2 m/s at an angle θ = 54° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
*February 12, 2014*

**physics**

The surface density of a thin rectangle varies as: σ(x,y)= 14.0 kg/m2 + 9.00 kg/m4(x2+y2) The rectangle has a length L = 0.500 m and a width W = 1.500 m. Calculate Iz, the moment of inertia about the z-axis.
*February 11, 2014*

**physics**

A block of mass 0.74 kg is suspended by a string which is wrapped so that it is at a radius of 0.060 m from the center of a pulley. The moment of inertia of the pulley is 0.0061 kg·m2. There is friction as the pulley turns. The block starts from rest, and its speed ...
*February 11, 2014*

**Physics**

Thank you very much.
*February 11, 2014*

**Trigonometry**

Suppose you were at the beach and notice that at 1:00 pm the tide is in, that is, the depth of water is at its deepest. At that time you find that the depth of the water at the end of the pier is 1.9 meters. At 7:00 that evening when the tide is out, the depth of the water is ...
*February 11, 2014*

**math**

The answer is 108.
*February 11, 2014*

**algebra**

Find an equation in slope-intercept form of the line passing through (0, 1) which is parallel to the line y = 6x – 23
*February 10, 2014*

**Math**

12/15-7-15+15=1 what is the missing number
*February 10, 2014*

**Precalculus**

Oops I meant sum and difference
*February 10, 2014*

**Precalculus**

Wow, I tried that but I messed up signs! Thanks!
*February 10, 2014*

**Precalculus**

Show that cot((x+y)/2)=-(sin(x)-sin(y))/(cos(x)-cos(y)) for all values of x and y for which both sides are defined.
*February 10, 2014*

**Liberty University**

A data set 106 body temperature of healthy adult humans for which, for x =98.7F and s = 0.72F
*February 10, 2014*

**economics**

After 17 vehicular accidents two years ago in a given intersection, the mayor of Boulder proposed to reduce the number of crashes by making improvements at the intersection. Assuming the appropriate CRF is 0.53, what will be the reduction in number of crashes at that ...
*February 10, 2014*

**Precalc**

A vehicle has an engine that is connected directly to a gear box. In the highest gear, a 2 inch radius gear is turning a 14 inch diameter gear. This gear is connected to the drive shaft. The drive shaft attaches to a wheel and a tire that measures 2 and 1/3 feet in diameter. ...
*February 10, 2014*

**Chemistry Help**

1.485
*February 10, 2014*

**Mathe**

The answer is 64
*February 9, 2014*

**Mathe**

The number has two digits. Both of the digits are even.the digit in the tens place is greater that the digit in the unit (or ones) place.the units (or ones digit) is not in the three times table. The tens digit is not double the ones digit. The sum of the two digits is a ...
*February 9, 2014*

**math**

The only way to get to Ship Island is to take the ferry which is free for babies (2 and under), $17 for children (3-10 years old), $25 for seniors (62 and older), and $27 for everyone else. Debbie paid $115 for 6 people in her family to go to the island for the day. Is it ...
*February 9, 2014*

**Math**

OHHH it has to be in terms of x! Thanks!
*February 8, 2014*

**Math**

Let f(x) be a polynomial such that f(cos theta) = cos(4 theta) for all theta. Find f(x). (This is essentially the same as finding cos(4 theta) in terms of cos theta; we structure the problem this way so that you can answer as a polynomial. Be sure to write your polynomial with...
*February 8, 2014*

**Physics**

The only force acting on a 4.7 kg body as it moves along the positive x axis has an x component Fx = -6x N, where x is in meters. The velocity of the body at x = 2.4 m is 11 m/s. (a) What is the velocity of the body at x = 4.9 m? (b) At what positive value of x will the body ...
*February 8, 2014*

**Wave**

What feature is NOT defined for a wave pulse? a)period b)wave speed c)the position of a particle at a certain time d)a defined source
*February 8, 2014*

**Math Sums and Differences**

a 8 b -7 c -7 d 11 e 3 f 35 a -7, -10, -13 b 5, 9, 13
*February 8, 2014*

**physics**

Q. A 200 kg load is suspended by a cable from a crane . Two ropes are attached to the load , acting at 90 deg to each other. One rope exerts a pull of 220 N , at 10 deg below horizontal, the other rope exerts a force of 360 N at 15 deg below horizontal. Calculate 1)tension in ...
*February 7, 2014*

**Math**

Harry Styles wants to make trail mix made up of almonds, walnuts, and raisins. He wants to mix one part almonds, two parts walnuts and, three parts raisins. Almonds cost $12 per pound, walnuts cost $9 per pound and, raisins cost $5 per pound. He has $15 to spend on the trail ...
*February 6, 2014*

**Physics**

If you can throw a stone straight up to a height of 18m, how far could you throw it horizontally over level ground? Assume the same throwing speed and optimum launch angle.
*February 5, 2014*

**physics**

Find the length of a simple pendulum that has a period of 5.00s . Assume g = 9.81 m/s2. Express your answer to three significant figures and include the appropriate units.
*February 5, 2014*

**algebra**

The questions is like this: sqr(2) + sqr(1), and the asnwer is 1 + sqr(2), or in decimal form: 2.4142
*February 5, 2014*

**Language Arts ~CHECK MY WORK PLEASE~**

Ok, now I can answer your last questions. The last one is right! good job
*February 5, 2014*

**Trigonometry**

Thank you very much; but these are the only answers! I don't know why, but I'll try to check with my teacher. Again, thanks for the help and showing your work, you're awesome!
*February 5, 2014*

**Trigonometry**

If a ship leaves port at 9:00 a.m. and sails due north for 3 hours at 12 knots, then turns N 30° E for another hour, how far from port is the ship? A. 45 nm B. 47 nm C. 51 nm D. 53 nm
*February 5, 2014*

**Trigonometry**

Wel, I'm not sure, I have two other questions with practically the same things, please take a look! If a ship leaves port at 9:00 a.m. and sails due east for 3 hours at 10 knots, then turns N 60° E for another hour, how far from port is the ship? A. 35 nm B. 39 nm C. ...
*February 5, 2014*

**Trigonometry**

If a ship leaves port at 9:00 a.m. and sails due south for 3 hours at 14 knots, then turns N 60° E for another 2 hours, how far from port is the ship? A. 14 nm B. 17.75 nm C. 21.5 nm D. 22.6 nm PLEASE HELP!
*February 5, 2014*

**Writing Evaluation (Writeacher!)**

This is really good. Just a few points- One, African american woman DO NOT earn less than white women "to this day", that is prejudiced as well as bias, and is illegal in the U.S. and many other countries. You might want to take that part off. Otherwise, good job!
*February 5, 2014*

**physics**

An object (with charge -4.2 µC and mass 0.024 kg) hovers at rest above the ground, its weight being held up by a uniform electric field.(a) Find the size and direction of this electric field.(b) If the electric charge on the object is quadrupled while its mass remains ...
*February 4, 2014*

**physics**

An object (with charge -4.2 µC and mass 0.024 kg) hovers at rest above the ground, its weight being held up by a uniform electric field.(a) Find the size and direction of this electric field.(b) If the electric charge on the object is quadrupled while its mass remains ...
*February 4, 2014*

**math**

laura favorite clothes are five sweater, four skirts, three jackets, two pairs of shoes and one belt. how many ways can laura wear her favorite clothes without repeating the exact outfit
*February 4, 2014*

**math**

a drinking glass 5 inches tall has a 2.5 inch diameter base. its sides slope upward at a 4 degree angle. what is the diameter of the top of the glass?
*February 3, 2014*

**Chem.**

How many milliliters of water has been dispensed if the initial buret reading was 0.38 ml and the final is 24.70 ml?
*February 3, 2014*

**Help!!!**

Thanks Emily i got a 100 % too
*February 3, 2014*

**math**

Draw different rectangles with the perimeter of 12 units
*February 3, 2014*

**Math **

2. Assuming your weekly gross earnings are $525, calculate your withholding tax using the wage bracket method and the percentage method.
*February 3, 2014*

**Finite**

Assume that there are 18 board members: 12 females, and 6 males including Larry. There are 4 tasks to be assigned. Note that assigning the same people different tasks constitutes a different assignment.
*February 3, 2014*

**Physic II**

A flat disk 1.0 m in diameter is oriented so that the plane of the disk makes an angle of π/6 radians with a uniform electric field. If the field strength is 491.0 N/C, find the electric flux through the surface. Please show step by step
*February 2, 2014*

**Physics**

1. If the angle of the boat is 150 degrees, v' = 3 m/s, and v0 = 3.0 m/s, how far do you drift downstream before you arrive at the other side of the river? (HINT: read the x axis.) 2. If the river flow rate (v0) = 3.0 m/s, and the angle (è, or “theta”) is ...
*February 1, 2014*

**physics**

8.31 m/s^2
*February 1, 2014*

**Calculus**

Find an equation of the plane. The plane that passes through the point (−1, 2, 1)and contains the line of intersection of the planes x + y − z = 4 and 4x − y + 5z = 4
*January 31, 2014*

**Math**

A rectangular yard measuring 30ft by 35ft is bordered (and surrounded) by a fence. Inside, a walk that is 4ft wide goes all the way along the fence. Find the area of this walk
*January 30, 2014*

**Physic II**

Two like charges of the same magnitude are 8.0 mm apart. if the force of repulsion they exert upon each other is 4.0 N, what is the magnitude of each charge? (The constant of proportional for the Coulombic force is 9.0 x 10^9 N.m^2/C^2 ) Please show all work.
*January 26, 2014*

**Geometry/Algebra/Calculus**

Why isn't the surface area of a sphere with radius r the following: 2*pi * (pi*r) That comes from the following flow of logic: Doesn't it makes sense to think of the surface area of the sphere with radius r as the the circumference of the semi-circle with radius r, pi*...
*January 26, 2014*

**Algebra**

Thanks Reiny
*January 25, 2014*

**Algebra**

A couple wishes to rent a car for one day while on vacation. Ford Auto Rental wants $35.00 per day and 14¢ per mile, while Chevrolet-For-A-Day wants $34.00 per day and 16¢ per mile. After how many miles would the price to rent the Chevrolet exceed the price to rent a...
*January 25, 2014*

**health**

the national weigth control registry found that those wno maintain aweigth loss reported improvememt in what
*January 25, 2014*

**Maths**

How many litres of water in a tank size 1.3m wide, 3.76m long and 0.73m deep
*January 24, 2014*

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