Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 6,187

**Precalculus**

Wow, I tried that but I messed up signs! Thanks!

**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.

**Liberty University**

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

**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 intersect...

**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. I...

**Chemistry Help**

1.485

**Mathe**

The answer is 64

**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 multi...

**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 poss...

**Math**

OHHH it has to be in terms of x! Thanks!

**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...

**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 h...

**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

**Math Sums and Differences**

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

**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 ...

**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 m...

**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.

**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.

**algebra**

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

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

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

**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!

**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

**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. 4...

**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!

**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!

**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 th...

**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 th...

**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

**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?

**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?

**Help!!!**

Thanks Emily i got a 100 % too

**math**

Draw different rectangles with the perimeter of 12 units

**Math **

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

**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.

**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

**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 ...

**physics**

8.31 m/s^2

**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

**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

**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.

**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*...

**Algebra**

Thanks Reiny

**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...

**health**

the national weigth control registry found that those wno maintain aweigth loss reported improvememt in what

**Maths**

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

**math**

The side length, d, of a cube that contains a sphere depends on the radius, r, of a sphere. Assuming that the faces of the cube are tangent to the sphere, write the volume of the cube as a function of the radius of the sphere.

**Physics**

so 81.34?

**Physics**

A rock is dropped from rest. How fast is it going after it has been falling for 8.3 s?

**physics**

A boy standing on top of a building throws a small ball from a height of H1 = 43.0 m. The ball leaves with a speed of 14.9 m/s, at an angle of 55.0 degrees from the horizontal, and lands on a building with a height of H2 = 14.0 m. Calculate for how long the ball is in the air....

**physics**

A fireman, 29.1 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 48.5° above the horizontal. If the speed is 51.6 m/s, at what height will the stream of water hit the building?

**Physics**

The figure shows a 7 kg block being pulled along a frictionless floor by a cord that applies a force of constant magnitude 20 N but with an angle θ(t) that varies with time. When angle θ = 29°, at what rate is the block's acceleration changing if (a)θ(t)...

**Physics**

A 33.4 kg child, with a 3.05 kg backpack on his back, first stands on a sidewalk and then jumps up into the air. Find the force (positive up/negative down) on the sidewalk from the child when the child is (a) standing still and (b) in the air. Now find the net force (positive ...

**Physics**

If a current is flowing with a value of 5.9 A, how much electron charge passes any single point in 25 seconds? A) 1.9 x 1020 e

**Physics**

Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 380 million kilometers and take 9.0 Earth years to orbit about a point midway between them. What is the mass of each? ------------------------------- I've worked thi...

**Physics**

DISTANCE D = 2 * (# of laps) * (length of pool) D = 2*69*35 = 4830 m TOTAL DISPLACEMENT You're going by the swimmer's final position, so if he ends up at the same place he started, the net distance (or in other words, the displacement) is 0. AVERAGE VELOCITY Displaceme...

**Algebra**

A boat can go 20 miles against a current in the same times that it can go 60 miles with the current. The current is 4 miles per hour. Find the speed of the boat with no current.

**Physics Classical Mechanics Help ASAP**

if i make a simple conversion from PE to KE an then velocity it gives me a red cross :( but i don see ho to fit the bigger block into thepicture

**Physics**

Estimate the force a person must exert on a string attached to a 0.200 kg ball to make the ball revolve in a circle when the length of the string is 0.600 m. The ball makes 1.40 revolutions per second. Do not ignore the weight of the ball. In particular, find the magnitude of ...

**PRE-CAL**

That's all the problem says

**PRE-CAL**

A rectangle is inscribed in a right triangle with legs of length 3 and 4. Express the area A of the rectangle as a function of x.

**Math**

P and Q are two towns.The bearing of Q from P is 070 degrees.What is the bearing of P from Q?

**Math**

We call a natural number "odd looking" if all its digits are odd.How many 4-digit odd looking numbers are there?

**Physics**

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: v(t) = a − bt + ct2 Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10*10^-3 m/s2 At a time of 36.0 s the speed, as...

**Physics**

the equation: v(t) = a âˆ’ bt + ct2

**Physics**

A car with a mass of 1264 kg is coasting in neutral on a straight,level road. It slows down, and its speed as a function of time is given by the equation: Constant Value Units a 26.8 m/s b 0.310 m/s2 c 2.10·10-3 m/s2 At a time of 36.0 s the speed, as given by the above ...

**Physics - please help!!**

A 395.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.29 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? Wh...

**Physics**

A 395.0 g block is dropped onto a vertical spring with a spring constant k = 252.0 N/m. The block becomes attached to the spring, and the spring compresses 0.29 m before momentarily stopping. While the spring is being compressed, what work is done by the block's weight? Wh...

**Math**

So would the answer be 6 or 3 then

**Math**

A line has y-intercept (0, 3) and is perpendicular to the line 2x + y = 3. Find the x-intercept of the line.

**Math**

Find the distance from the point (2, 3) to the line x − y = 5.

**Math**

f(x)=13x^2 -15x-14 g(x)=15x^3+14x^2-15x+12 find f(3) × f(10) + f(-7) × g(9)

**Science**

as do i

**Math**

one day?

**Science**

If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the number of trout that a particular stream can support. Fill in the blank T...

**Science**

i dont know that one i just guesed lol can u help me with this one If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the number...

**Science**

Please Help ME Plz

**Science**

If Changing conditions lead to the decreased ocygen levels in the stream the carrying capacity of the stream for the trout will decreace oxygen levels in water is therefore a ________ with respect to the number of trout that a particular stream can support. Fill in the blank T...

**Science**

thats what i said (in a 7th grade science test in conexus) lol

**Science**

I Hope Thanks for the help

**Science**

disturbance of an ecosystem by human activity often has negative effects on the number of species which is a measure of its ___________.?

**Physics**

415

**Physics**

A block of mass m = 5.2 kg is released from rest at a height of H = 4.0 m on a curved frictionless ramp. At the foot of the ramp is a spring whose spring constant is k = 192.0 N/m. What is the maximum compression of the spring, x? After the spring reaches its maximum compressi...

**Algebra 11th**

Activity 1: Graphing To fill an order for Sizzlin' Sauce sauces, you bought 1050 green peppers and 1200 hot chili peppers. • Write and graph a system of inequalities to represent how many pints of each kind of sauce you can make. Use the recipes below. • Select o...

**math**

He earned $300 which equals 6% Divide $300 by 6 to get 1% $50 is 1% , then multiply $50 by 100 to get 100% sales Answer $5000 in sales

**4th grade math**

that super easy just do 12*365+3=4383

**science help!!!!**

Disturbance of an ecosystem by human activity often has negative effects on the number of species, which is a measure of its __________________.

**science**

If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support

**science**

i need the same help

**physics**

When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2. Determine the mass of the puck.

**seince**

According to the principle of supply and demand, the price you pay for a product is determined both by its availability and by consumer demand for the product. On the basis of this principle, which minerals do you think a higher value, iron-containing minerals or feldsparS? Ex...

**science urgent need help**

What is the independent variable? Select one option from the list below. 1 is the correct answer help me please .thanks Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient ...

**Science need help**

What is the independent variable? 1 is that the correct answer help plz Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the oth...

**science help plzzzzzzzzzzzzzzz?**

but its different then the other this one independent variable

**science help plzzzzzzzzzzzzzzz?**

Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...

**Science need help**

Sue is setting up an experiment to test whether fly maggots select a dark or a brightly lit environment. She sets up a chamber in which there is a gradient in light intensity from one end (dark) to the other (brightly lit). The experimental hypothesis was “There will be a...

**Math- urgent**

2x = 28 x = 14

**calculus**

the tangent line to the curve y=x^2 at the point (a,a^2) passes through the point (2,1) find all possible values of a. Thank you so much!!

**science**

Thank you!!!

**science**

How is biodiversity related to human activities that use natural resources? A.biodiversity decreases as humans use natural resources wisely B.biodiversity decreases as humans limit there use of natural resources C.biodiversity increases as humans deplete natural resources D.bi...

**science**

answers are all wrong the right ones are these: A.there will be fewer renewable resources B.more humans will populate the earth C.biodiversity naturally reduces over time D.more humans will recycle materials

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