# Posts by greg

Total # Posts: 476

**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 ???

**Can someone Please Help**

Chemistry

**Can someone Please Help**

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

**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.

**Derivatives (check answer)**

Let y=x^5 - pi^5. Find dy/dx My answer is 5x^4 because pi^5 becomes 0? Am I correct?

**Algebra (Please check)**

Number 1 I know is D

**Algebra (Please check)**

PLEASE CHECK MY ANSWERS (: I just want to make sure I am doing this correctly __________________________________ Graph the system of constraints and find the value of x and y that maximize the objective function. Constraints: x ≥ 0 y ≥ 0 y ≤ (1)/(5) x + 2 5...

**Algebra (Need help desperately)**

Thanks :D I'm 90% sure number 1 is D, but do a good way how I could do 2 or 3? If you don't mind explaining to me?

**Precalculus**

he distance between 2 points (x1,Y1) and (x2,y2) is given by d = square root (x1-x2)^2 + (y1-y2)^2 a - pick 2 arbitrary points in 3 dimensions, (x1, y1, and Z1) and (x2,y2,z2) and plot these points. Not that there are 90 degrees between the xy, xz, and yz axes. b- using your ...

**Precalculus**

The distance between 2 points (z1,Y1) and (x2,y2) is given by d = square root (x1-x2)+ (y1-y2)^2) a - pick 2 arbitrary points in 3 dimensions, (x1, y1, and Z1) and (x2,y2,z2) and plot these points. Not that there are 0- degrees between the xy, xz, and yz axes. b- using your ...

**Calculus (Check)**

This seems to easy. Check please. Find. Lim (x^2)-4 x->2 e I substitute in 2 (2^2)-4 e gives me 4-4 e So my answer is e^0 or 1.

**Calculus with Analytical geometry**

I'm stumped on this one. lim |x-1|sin(1/x-1) x->1

**Calculus**

Thank you, I see where I made my error now. X^2 over x^2 becomes 1. I cancelled them out.

**Calculus**

Check my work please? Determine if f(x)= (x^2-3x+2)/(1+x^2) has a horizontal asymptotes. If so, give the equation. So I took x^2 and divided everything by it. (x^2/x^2)-(3x/x^2)+(2/x^2) / (1/x^2)+(x^2/x^2) Cancelled out some x's and have -(3/x)+(2/x^2) / (1/x^2) Now as x ...

**Precalculus**

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

**Precalculus**

Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute. (1 minute = 1/60 degree) This is a nautical mile. Note that the radius of the Earth is 3960 miles and there are 1760 yards in a mile. Express your answer in both miles and yards.

**Chem I**

Ammonia is composed of H and N in a ratio of 9.33g N to 2.00g H. If 4.56g N combine completely with H to form ammonia, how many grams of ammonia would be formed? How do you calculate this?