# Posts by haley

Total # Posts: 738

Calculus
What is the second derivative of (x^3)/(x^2-1)?

What is the second derivative of (x^3)/(x^2-1)? And how would I accurately graph both the derivative and the second derivative of this function?

CHEMISTRY HELP
56.3

CHEM 112
A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?

CHEM 112
A buffer solution is 1.40 M in NH3 and 1.00 M in NH4Cl. If 0.100 moles of NaOH are added to 1.00 L of the buffer, what is its pH?

chemistry
Suppose we want to charge a flask with 4.0 g of sugar. We put the empty flask on a balance and it is determined to weigh 190 g. Enter the weight we would expect to see on the balance when we're done adding the sugar.

Math
yes

Math
I am having a problem understanding my homework. use the grid to draw a rectangle, then complete the calculation 23 x17 Help thanks

calculus
using f'(x) as the limit of h approaches 0 [f(x+h)-f(x)]/h find: f'(x), given f(x)=|x|

language arts
sentence

language arts
verb is to ______ as zipcode is to address (unscramble) csteeenn

Algebra 2
what is .5 cubed?

algebra 1
4+x/8=3/4

math
find the coordinates of the missing endpoint given that p is the midpoint of NQ N(5,4) P(6,3) Q(3,9) P(-1,5)

algebra
every inch on a model is equivalent to 3.5 feet on the real boat. what would be the mathmatical rule to express the relationship between the length of the model, m, and the length of the boat, b?

Mathematics
13/52

Geometry
Which equation can be used to find the unknow ange measures? The diagram is a triganle. A= x+30, B= 3x, and C = x-15 A 5x+15=90 B 5x+45-180 C 3x^3+15=180 D 5x+15=180 E 3x+30=180

Chemistry
A sample of gas occupies a volume of 500.0mL at .906 atm and 97 C. What will the final temperature (in Celsius) be if it is brought to a volume of 1.05L and a pressure of 502 mm Hg?

physical science
the moderate temperatures of islands throughout the world has much to do with waters: A. hgih evaporation rate. B. vast supply of thermal enerygy. C. poor conductivity D.high specific heat capacity.

biology
what is the scientific study of heredity

math
27 bags

math
25.6

science
whats the breakdown of water to form two gases is the result of this process?

Finance
I need help computing the Annual percentage yield (APY) for a savings account that earned \$56 in interest on \$800 over 365 days? HELP PLEASE!

Finance
I need help computing the Annual percentage yield (APY) for a savings account that earned \$56 in interest on \$800 over 365 days? HELP PLEASE!

Math
Jake spent 3/8 of his money on a book and 1/2 of what was left on a magazine. He now has \$6.25. How much money did he start with?

science
What is the current produced by a potential difference of 240 volts through a resistance of 0.2 ohms?

social studies
what forms part of the escarpment along the southern edge of the african continent

English
1. Neither (she, her) nor I will be at the assembly today. 2. To (whom, who) did you address that package? 3. Mrs Jamison and (he, him) were my favorite teachers last year. 4. (Who, Whom) remembered to bring a flashlight? 5. Did the club elect (her, she) president? 6. (He, Him...

precalc
What are parametric equations? How would you find the rectangular eq's when given parametric eq's? and how would you find parametric eq's when given rectangular eq's? for example, given x=cos4t and y=sin4t (t is between 0 and 2pi) what is the retangular ...

precalc
solve the system of equations: x^(2)+y^(2) = 12 xy = -4

precalc
Find the equation of the parabola: x^(2)+4x = y-8

logarithms
thanks

logarithms
Please help, im so confused. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

logarithmic functions
so the coefficient of a log function are the same as writing it as an exponent of x in the equation: log(subb)x = y ? therefore, Clog(subb)x = y is the same as log(subb)x^(C) = y ?

logarithmic functions
okay. how would you solve: 2log(subscript6)(4) - (1/3)log(sub6)(8) = log(sub6)(x)

logarithmic functions
How do you just know this though?

logarithmic functions
log(subscript 2)(0.5) I know how to convert it into: 0.5 = 2^(y) but then how do I find y?

Chemistry
Explain exactly how you would make 1 liter of a .10 M acetic acid solution using vinegar from the lab as the stock solution to be diluter.

psychology
in my psychology textbook this is called the bystander effect with the answer choices you have i would say diffusion responsibility, but i am not sure. It is definitely not A though.

Excel
Want to create a worksheet that will help track your grades and. What formulas and/or functions might you use?

Math
John bought 2 pounds of chocolate for \$7.50. Write expression to find the cost of 3.5 pounds of chocolate?

geometry
345.6

Early Childhood Education
A child’s oral vocabulary is closely related to: A. his printing ability and scholarship. B. reading comprehension and ease in learning to read. C. creativity and motivation. D. attention span and distractibility. I think the answer is A

physics
A block of mass m = 2.00 kg slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.20 kg which is at rest on a horizontal surface Determine the speeds of the two blocks after the collision. lighter block = heavier block = what ...

physics
After a completely inelastic collision between two objects of equal mass, each having initial speed v, the two move off together with speed v/6. What was the angle between their initial directions? if this is the equation 2mvcos(theta)=2mv/6 what numbers would replace m and v?

chemistry
At pH 7.2, what is the ratio [HPO4 2-]/[H2PO4-]

chemistry
Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5

math
16_k=8 In the equation above, _ represents one of the operations of arithmetic: addition, subtraction, multiplication, or division. If k is a positive integer not equal to 8, what must be the value of k?

physics
It is c

Math
What is the unit rate of 32 miles per hour?

Math
A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

Math
A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

Math
10 Jumps Thanks for all your help.

Math
a Frog is at the bottom of a 21 foot well. The frog jumps up 4 feet, and then falls back 2 feet. How many jumps will it take for the frong to jump out of the well?

Math
Thanks. Now I understand.

Math
After 7 jumps foward and 6 backward.

Math
I don't have any idea.

Math
Jump Number Position After jump forward Position after Step Back

Math
Barbara is playing a game. She jumps forward 5 feet, and then steps backward 2 feet. How many jumps will it take her to reach the finish line, which is 20 feet from where she started? Make a table to show Barbara's position. Barbara will reach 20 feet on jump number _____...

Physics
An m = 6.80-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22.0 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2670 N for 0.110 s. One piece of mass m1 = 2.80 kg ...

Physics
How many rpm's will a 2'' Nd45 sphere do spinning at 340.29 m/s. Please help me!! =(

Physics
How many rpm's will a 2'' Nd45 sphere do spinning at 340.29 m/s. Please help me!! =(

english/ grammar
thanks

english/ grammar
would you say: her aspiration of freedom or her aspiration for freedom ?

Math
Why does the division of zero equal one? I just do not understand the process. I've researched it and I have read the responses, but I do not understand them. Can Someone explain it further?

Physics
You serve a tennis ball from a height of 2.29 m above the ground. The ball leaves your racket with a speed of 18.7 m/s at an angle of 6.55° above the horizontal. The horizontal distance from the court's baseline to the net is 11.89 m, and the net is 1.07 m high. ...

math-precalc
In the shot put, the shot must land within a 40 degree sector. Consider a coordinate system where the vertex of the sector is at the origen, one side lies along the positive x-axis, and the units are meters. If a throw lands at the point with coordinates (16, 12), how far is ...

physics
m= .025 kg initial velocity= 27 m/s time= 5.0*10^-4 final velocity= 10 m/s Force*time=mass( final vecolicy - negative initial velocity) F(5.0*10^-4)=(.025)(10-(-27)) F=(.025)(10-(-27))/(5.0*10^-4)

The largest Ferris Wheel in the world is the London Eye in England. The height (in metres) of a rider on the London Eye after t minutes can be described by the function h(t) = 67 sin[0.2094(t-30)] + 70 Using this equation i'm supposed to find the diameter, the maximum (top...

math formula?
Thank you so much!

math formula?
Based on an average cost per year to attend a university or college of your choice, how much should be invested each month to obtain the goal of that amount (the goal is 40,000\$)? Assume 6%/a compounded monthly for 5 years. I don't need the answer, just the formula please!

physics
A force of 100 Newtons acts upwards on a mass of 50 kg, another force of 60 newtons acts on the same mass downwards. calculate the accleration in which direction will be the accleration

math
How do you find (in radians) the exact value of: tan[pi-(pi/12)]

math
solve the first equation for y. 5x-y=-1 subtract 5x from both sides -y=-1-5x divide by -1 y=1+5x now, plug this answer in for y in the second equation. 15x=2y 15x=2(1+5x) 15x=2+10x 5x=2 x=.4 plug this(x=.4) into the equation for y. y=1+5x y=1+5(.4) y=1+2 y=2 therefore, x=.4 ...

Math
You can simplify the fraction 14/8 by dividing both the top and the bottom by a common factor. if you divide them both by 2, you get 7/4.

Math
thanks. How would you know how to do similar problems? Where should i start when verifying trig equations?

Math
verify that the equation is an identity: (1-cosX)/(1+cosX) = (cscX-cotX)^2

How to convert 4.65 into a fraction but in simpilest form while showing your work?

physics
A tightly stretched "high wire" is 44 m long. It sags 3.8 m when a 56 kg tightrope walker stands at its center. What is the tension in the wire? 1 NIs it possible to increase the tension in the wire so that there is no sag? so far i know you do the inverse sin of (3....

Chemistry
The empirical formula of a compound is CH2O and the molecular mass is 180. What is the molecular formula of the compound?

Chemistry
What is the total mass of iron in 1.0 mole of FeCO3?

Chemistry
A gas has a volume of 1,400 milliliters at a temperature of 20.0 K and a pressure of 101.3 kPa. What will be the volume when the temperature is changed to 40.0 K and the pressure is changed to 50.65 kPa?

physics
A hypothetical planet has a radius 2.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? What equation should i use?

algebra
4(3-u)+u=22+2u what does u equal?

Math
1. 6,340

Math

Math
input (f) 5,10,2,8 Output f(x) 22,47,7,37 My question is what is the rule?

algebra
because if you only buy five you wont have enough pencils for the whole class that's why you need 6

math
There not rectangles!

math
Rational

help! physics
Two masses (m1 = 532 grams, m2 = 114 grams) are connected with a rope through a frictionless pulley The ramp has an elevation angle θ = 65.3° and a coefficient of friction μ = 0.184. What are Fll and Fperpendicular for m1? What is the normal force on m1?

physics
an atwood machine is set up with m1=234 grams and m2=485 grams. the height of m2 above the floor is 137 cm, and the system is released from rest. the pulley is frictionless. what is the acceleration of this system? what is the tension in the string? how long will it take for ...

chemistry
Thank you so much!!! We do not know the pressure or temperature of the classroom though. This assignment was given to us for homework. We are to figure out the numbers and send them to our teacher then use them to do the lab in class tomorrow. Should we use a temp and pressure...

chemistry
Alright class. Your task is to produce 175mL of carbon dioxide. You many use anything in class. You have 1 class period to produce your product. You can use as much sodium carbonate and 1.0M hydrochloric acid as needed. ( Remember is stoichiometry lab)

chemistry
Your task is to produce 175mL of carbon dioxide. You many use anything in class.

math
solve 2sin^2 theta-7 sin theta= -3 for theta, where 0<theta<360 degrees

math
write the general solution to 2cos^2x+cos x=1

physics
two crates, of mass 75 kg and 113 kg, are in contact and at rest on a horizontal surface. A 727 N force is exerted on the 75 kg crate. If the coefficient of kinetic friction is 0.15, calculate the following: a)the acceleration of the system b) the force that each crate exerts ...

physics
what is theta, the x component, and the y component if you know the following standard vector notation: 239 m @ 261 degrees magnitude: 239 m navigational angle: 261 quadrant:3

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