# Posts by greg

Total # Posts: 489

Physics
Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles á = 41.9° and â = 26.7° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?

Finite Math
A sinking fund is the accumulated amount to be realized at some future date (the end of the term) when a fixed number of periodic payments are paid into an account earning interest at the rate of i per period.

Physics
6.32 m/s

math
250 people on a plane; 120 speak english;150 speak spanish; 30 speak neither. what probability speak English and Spanish ?

Math
Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

calcullus
Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

Physics...NEED HELP
Physics help. what are the steps to solving the following problems? Attack on the ice fortress! A comic book villain has taken shelter in an ice fortress in an attempt to hide from the Avengers. Apparently, though, only the Hulk and some guy with a cannon are available to try ...

math
If the probability of an event happening is 2/5, then the probability of the event not happening is 3/5? This is False. The answer is 1/3. Explain why the answer is 1/3

english
is correct to say "the patient was brought to the operating room." ? "was brought" seems awkward. Instead, "the patient was taken to the OR."

computer science
I need help one how create a spreadsheet that will give an accurate launch profile for a vertical liftoff for the SpaceX Falcon 9 rocket. the information they give me is: •Start with a rocket with a mass, M1, moving with a speed, v1 •The rocket expels some small mass...

volumes of prisms
How do the volume of prisms compare as the number of faces in the prisms increases? Does the volume remain the same? Explain Please!

math
It costs \$35 for 5 friends to go it for lunch. How much is the total bill including 8% tax? How much will each person pay if everyone pays an equal amount?

Physics
For parts A-C: /^Vo | 2M | velocity into pg. ->R )2m ) ------ top view rear view A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not banked – it is a flat surface. Assume the car and the road are on Earth’s surface...

Chem
How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

chem
Given that Ka for HClO is 4.0 × 10-8 at 25 °C, what is the value of Kb for ClO– at 25 °C? Given that Kb for CH3CH2NH2 is 6.3 × 10-4 at 25 °C, what is the value of Ka for CH3CH2NH3 at 25 °C?

Chemistry
I know how to do the ice chart and set up i just don't know how to get the x value that you are saying that i know...

chemistry
I don't understand what Y and X are supposed to be

Proctology
Hi, I am an 11th grade student beginning to look into some college options. I am interested in pursuing a career in proctology and have been reading some preliminary books on the topic. Can anyone recommend a college or pre-med program that would offer a strong proctology ...

Critical Points, Etc.
find the values for a, b, and c such that the function f(x)= x^3 + ax^2 + bx+ c has a critical point at (1,5) and an inflection point at (2,3). a= -6 b= 3 c= 7 i got those, but they're wrong. i'm not sure why. :/

Tangent Lines (2)-Calculus
find an equation of the line tangent to y= sqrt(25-x^2) at the point (3,4) i got y= x/8 + 29/8 this is wrong. but im not sure why. can you explain thank you

Tangent Lines-Calculus
a line is tangent to the curve y= (x^2 + 3)/ (x+3)^1/2 at the point where x=1. write the equation of this line i get y= 3x-1 yet it's wrong. please explain thank you

CHEM
IM SORRY!!!

Math(problem solving)
23- 4,7,10,12,13,15,16,18,19,20,21,22,24, 25,26,27,28,29,30,31,32,34,36

Quantum Physics
The March 9 comment is right.

Algebra
Linear Function graphing. y=-x ???

Chemistry

You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A What would be the temperature of absolute zero in A ?

Chemistry
You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A What would be the temperature of absolute zero in A ?

Chem Help!!!!
thank you

Chemistry
I used slope to find the answer to the first part which was correct... the second part is what I need help with

Chemistry
Where did you get 44.4 from

Chemistry
Can someone pls help me!! You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute ...

Chem Help!!
How many inches is the section of the bar

Chemistry
You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute zero in A ?

Precalc?
Suppose that Cot(theta) = c and 0<theta<pi/2. what is a formula for tan (theta) in terms of c? Cot = 1/tan I know that, but I don't understand what the question is really asking for.

Calculus
Calculate Directly Log (base 4) 2 + log (base 16) 2

Math
Write fraction in simplest form. 25x2/35x

chemistry
i just need help to set them up

chemistry
10. If the calcium oxide were obtained by the heating of calcium hydroxide, how much hydroxide would be needed to obtain the 15.0 g? 11. If the 15.0 g of calcium oxide in the above problems were allowed to react with water, what amount of calcium hydroxide would be produced? ...

math
Solve sin2x + sin4x = cos2x + cos 4x for x in the interval[0,2pi) Hint: the following substitution should come in handy: sin3x= cos3x . tan3x

accounting
uyguk

math
Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches between the model and the ...

math
Toby is making a scale model of the battlefield at Fredericksburg. The area he wants to model measures about 11 mi by 7.5mi. He plans to put the model on a 3.25 ft by 3.25ft square table. On each side of the model he wants to leave at least 3 inches between the model and the ...

soc 305
In American society, those least likely to be living in poverty are ____________.

Physics
A thin, uniform rod is hinged at its midpoint. To begin with, one half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 6.8 rad/s about an axis that is perpendicular to the left end of the rod and parallel...

Social Studies
I was wondering if I could check my answers with someone. I'm a bit confused with interest. I put stars next to the answers I chose. Thank you. An interest rate is a special type of (1 point) loan. **price. bank. service. 2. How does a compound interest rate differ from a ...

Conjecture
what conjecture could be made and proven from the following? sin(3x)/sin(x) - cos(3x)/cos(x) I put it on my calculator and based on the graph I say that as it crosses the y axis the values get larger.

Difficult Trig Word Problem
sorry y(t) =4e(then the exponent -3t) all times sin(2pi*t)

Difficult Trig Word Problem
The displacement of a spring vibrating in damped harmonic motion is given by y(t) = 4e^-3t sin(2pi*t) where y = displacement and t = time with t greater than/equal to zero. Find the time(s) when the spring is at its equilibrium position (y=0). The number "e" is Euler...

Precalculus 2
Similiarly to a question I asked previously I took the same approach. the problem is: what value(s) of theta solve the following equation? cos(theta)sin(theta) - 2 cos(theta) = 0? I let Cos theta = X and sin theta = X unfortunately I end up with something completely odd. Can ...

Triangles
solve any triangles satisfying alpha = 20 degrees b = 10 c = 16 b and c are 2 side values and if I use the pythagorean theorem and I get 18.18? Did I do this right?

Trigonometry
What value(s) of theta solve the following equation? cos^2(theta)-cos(theta)-6=0? I try plugging in different numbers but I am not sure exactly what I am looking for in order to solve?

Precalculus
Sorry but I meant to say LS = cos^2x-sin^2y

Precalculus
Prove or disprove cos(x+y)cos(x-y)=cos squared (x) - Sin squared (x) I dstributed the cosines and attempted to cancel out terms but I can't get the signs right. Any help on what I am missing?

Physics
A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 29.0 m/s. With what maximum speed can it go around a curve having a radius of 88.0 m?

Physics
An air puck of mass 0.23 kg is tied to a string and allowed to revolve in a circle of radius 1.0 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of 0.9 kg is tied to it. The suspended mass remains ...

Physics
A race car starts from rest on a circular track of radius 445 m. The car's speed increases at the constant rate of 0.380 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following. (a) the speed of the race car (b...

Physics
A rotating wheel requires 8.00 s to rotate 29.0 revolutions. Its angular velocity at the end of the 8.00 s interval is 95.0 rad/s. What is the constant angular acceleration of the wheel? (Do not assume that the wheel starts at rest.)

Precalc/Triangles
Draw and solve any triangles satisfying alpha = 29 degrees a = 7 c = 14 I realize I need to draw a non-right triangle and label the sides but I am completely confused one what to do after I draw the triangle

Physics
A 7.45-g bullet is moving horizontally with a velocity of +348 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The ...

physics
A 7.45-g bullet is moving horizontally with a velocity of +348 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The ...

Programming-Array
If i have a string with a word 'today' in it. If a user inputs a char (lets say b). how do I right the array to make it see if the char "b" is in the string today. LOOP??? int i; for(i=0; i<SIZE; i++) { guessedChar[i]; /*or*/ wordString[i]; }

Programming
int a = 10; int b = 5; int total = 0; printf("%d + %d = %d\n", a, b, total); printf("%d - %d = %d\n", a, b, total); printf("%d * %d = %d\n", a, b, total); printf("%d / %d = %d\n", a, b, total); /*Without an array*/ if(var == 1) { return ...

physics
The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have ...

C programming
I'll help you but I'm not gonna right your code for you. What are you lost on?

Computers
carpel tunnel syndrome? is that what your asking?

phi 103
"If that wasn't illegal, then it wouldn't be against the law" may commit which fallacy?

physics
The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have masse

physics to be solved ..easy !!
You need to account for the force of gravity which also has to be overcome and which you ignored.

Calculus L'Hopital Rule
lim x->0 (x)sin(x)/1-cos(x). They both go to 0 so 0/0. now take L'H and product rule of top? lim x->0 (1)sin(x)+ cos(x)(x)/1-cos(x) what next? how do i solve from here?

Calculus
f(4)= 4^4 e^-4 = 4.6888

Calculus
f(x)=x^4e^-x f(0)=0^4e^0 = 0 f(-4)=-4^4e^4 = 13977.13 I feel like i didn't do that right. It seems like a weird number for a critcal point.

Calculus
Sub 0 and -4 into f(x). or f'(x)?

Calculus
Would the derivative be e^-x (x^4-4x^3)?

Calculus
Find the critical points of f(x)=x^4e^-x. You would use the product rule. Then what?

Calculus
The side of a square box is increasing at a rate of 4mm/s and its height is increasing at a rate of 2mm/s. How fast is the volume increasing when the side is 40mm and the height is 100mm. Can someone just tell me what formula to use?

Calculus
y=sqrt(x)^1/x. Find dy/dx That is to the power of 1/x So to start this do I need to take Ln on both sides and then use a logarithm property? Ln(y)=lnx^1/2x?

chem
The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in ...

chemistry
how would you separate a mixture of NaCl, Fe pellets and water

chemistry
how would you separate a mixture of NaCl, Fe pellets and water

Chemistry
Complete the electron dot structure below to show how beryllium flouride (BeF2) is formed. F F Be+ -> Be F F

Chemistry
What is the coordination number of the ions in a face-centered cubic crystal? In a simple cubic crystal?

Chemistry
Write the symbol and electron configuration for each ion and name the noble gas with the same configuration. a. nitride _________________________ b. oxide ___________________________ c. sulfide _________________________ d. bromide _________________________

Chemistry
How many electrons will each element gain in forming an ion? a. Nitrogen ______ b. Oxygen ________ c. Sulfur _______ d. bromine _______

Chemistry
Why do beryllium and flouine combine in a 1:2 ratio?

Chemistry
Complete the electron dot structure below to show how beryllium flouride (BeF2) is formed. F F Be+ -> Be F F

Precalc/Trig Word Problem
From the top of a 200-ft lighthouse, the angle of depression to a ship in the ocean is 23 degrees. How far is the ship from the base of the lighthouse?

Word Problem
In a certain individual the resting diastolic pressure at time t is given by B(t)= 80+7sin((pi)(t)/(12)) where t is measured in hours since midnight and B(t) in mmHg (millimeters of mercury). Find this person's pressure at 6:00 am, 10:30 am, noon, and 8:00 pm.

Precalculus/Trig 6
Find the exact value of the following trigonometric functions: sin(13pi), cos(14pi), tan(15pi)

Precalculus/Trig 5
Find the exact value of thet following trigonometric functions: tan(5pi/6) tan(7pi/6) tan(11pi/6)

Precalculus/Trig 3
The degree measure of an angle theta is 40 degrees. What is the radian Measure of theta? at what point P does the terminal ray intersect the unit circle (what is the ordered paid P(____, ___)?

Precalc/Trig 2
The point P lies in the 4th quadrant and is located on a circle of radius 2. Find the missing coordinate for P. (___, (negative square root of 3)).

Precalc/Trig 1
What equation would you use to show that the point ((square root of 11)/(6), (5/6))is on the unit circle?

math
65 men 75 women are enfolled in calculus. There are 30 business majors, 40 biology majors, 50 computer science majors, and 20 mathematics majors. No person has a double. If a single calculus student is chosen, find the probability that that the student is not a mathematics major

Physics
A ball is thrown downward at 12.3 m/s. How much time does it take for it to reach the ground, 182.6 m below?

Physics
A student drops a rock off a bridge. The rock has a mass of 5.81 kg. If the bridge is 48.7 m high, how much time does it take it to reach the water below?

Math
What compound polygon has 28cm and area 48 cm

Precalculus SOH CAH
how are the following relations true? S(theta + pi/2) = C(theta) and C(theta + pi/2) = -S(theta)?

math
You do 14500 times .09 then you add that to 14500 to get year 1 then repeat that till you get 22309.51.or something close to that.