# Posts by Nikki

Total # Posts: 726

**statistics**

The pew research center recently polled n=1048 u.s. drivers and found that 69% enjoyed driving their cars. In 1991 a poll reported this percent to be 79%. Using the data from this poll ,test the claim that the percent of drivers who enjoy driving their cars has declined since ...

**5th grade Math**

Once a month a fast food chain offers a special when a coach brings in a team. Buy 5 hamburgers and get one free. This month, a team goes in after their game. Each person had one hamburger. Each of the players had a soda @ $.50 each and shared an order of french fries ($.95 ...

**Physics**

If a gas tap is turned on for a few seconds, someone a couple of meters away will hear the gas escaping long before he or she smells it. What does this indicate about the speed of sound and the motion of molecules in the sound-carrying medium?

**math**

-8a^2+5ab-12a^2-6(2a^2-4ab-10n^2)

**Physics**

Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain.

**Physics**

Can an electron at rest in a magnetic field be set into motion by the magnetic field? What if it were at rest in an electric field?

**Chemistry**

I'm having trouble giving the formula for this coordination compound: sodium diamminetetrachloroplatinate(IV) I think that it has to have a charge because it has Na+ and [Pt(NH3)2Cl4] (which is neutral), but Na[Pt(NH3)2Cl4]+ is wrong. Please help!

**Chemistry**

Thanks, I got it right!

**Chemistry**

A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.9 x 10^-11 for Mg(OH)2 and Ksp = 6.0x10^-26 for Sn(OH)2. What [Sn2+] is required so that the [Mg2+] in solution will be 0.15 M?

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.6 kg m^2. A second student tosses a 1.5 kg mass with a speed of 2.9 m/s to the student on the stool, who catches it at a distance of 0.40 s from the...

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.2 . A second student tosses a 1.1 mass with a speed of 3.0 to the student on the stool, who catches it at a distance of 0.45 from the axis of ...

**math**

this can also be expressed as 15-20, which equals -5 so, +15 + -20=-5

**algebra**

36sqrt(2)

**physics**

Suppose partial melting of the polar ice caps increases the moment of inertia of the Earth from 0.331MR^2 to 0.332MR^2. What is the change in length of day in seconds?

**physics**

A student sits at rest on a piano stool that can rotate without friction. The moment of inertia of the student-stool system is 4.6 kg m^2. A second student tosses a 1.5 kg mass with a speed of 2.9 m/s to the student on the stool, who catches it at a distance of 0.40 s from the...

**Literary Analysis and Composition**

can you please tell me if these are right and if not could you please help? Like autobiographies, diaries are usually written in the privacy of one’s room. in the decades after one has important experiences. in the second-person point of view. -in the first-person point ...

**physical science**

What is Final Velocity? I don't understand it at all!!

**chemistry**

When copper(II) oxide is heated in the presence of hydrogen gas, elemental copper and water are produced. What mass of copper can be obtained if 22.8 g copper(II) oxide is used?

**chemistry**

What volume of a 3.00 M KI stock solution would you use to make 0.270 L of a 1.25 M KI solution?

**Literary Analysis and Composition**

respect for the power and wildness of the natural world. is outwardly embarrassed or clumsy but is a very different man on the inside. joyful animation allowing readers to experience Walter Mitty's daydreams more closely. Some people make up their minds and cannot be ...

**Literary Analysis and Composition**

could you please help with these questions? In works like "To Build a Fire," Naturalist writers such as Jack London advocated (Points : 5) trusting entirely in the wisdom and ingenuity of human beings. respect for the power and wildness of the natural world. ...

**MATH**

Which of the following sums is larger and by how much? (n=1) Y1 = 7 over Σ 15/4(pi/10)^n Y2= 11 over Σ 17/4(4/13)^n

**MATH**

what is the general term of the following series? 60/121-30/11+15-...+219 615/ 16

**geometry**

how can the slope formula help you remember the equation for the point-slope form of a line?

**Calculus**

Consider the function f defined by f(x)= sin x/x, x cannot equal 0 1, x cannot equal 0 a) At what points does the graph cross the X-axis? b) What is the relation between f(x) and tan x at points x cannot equal 0 at which f(x)=0? c) What is the behavior of f as the absolute ...

**physics**

d = __________________ m from where the first pulse originated please help me!!!!!

**physics**

A 13.5 m long wire of mass 173 g is stretched under a tension of 269 N. A pulse is generated at one end, and 16.5 ms later a second pulse is generated at the opposite end. Where will the two pulses first meet?

**creative activities in other curriculum areas**

which one of the following methods is preferred for teaching songs from recordings to young children? a-the phrase-wise method b-the whole-song method c-the combination method d-the strong-melody method

**Chemistry**

Convert: 5.72 kJ to kcal

**geometry**

a triangle has two sides that have lengths of 14 feet and 22 feet. which of the following lengths could not represent the length of the third side... A 8FT B 12FT C 14FT D 20FT

**algebra**

To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. Write an equation using only one variable that could be used to ...

**Algebra 1**

The world record for the mile was 4:10 and 3:49 in 1975. Assuming that the record improves in a linear fashion (which it has so far) write an equation to predict the mile world record (in seconds) for a given year (y=record in seconds, x=year) What should the world record be ...

**chemistry**

A pH glass/calomel electrode was found to develop a potential of -0.0390 V when used with buffer of pH 5.52. With an unknown solution, the potential was -0.360 V. Calculate the pH of the unknown solution

**Math**

Can someone please please help me understand how to go about solving this? (not really answering it, but actually explaining it-pretty please?) "The zipper and the safety pin were invented in the 14th century. The safety pin was invented 44 years before the zipper. The ...

**calculus**

A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 30 ft from the base of the pole

**Emergancy help!!!!!!!!!**

Classify the model as exponential growth or exponential decay. Identify the growth or decay factor and the percent increase or decrease per time period. y=16(1.25)^t

**Math**

y=16(1.25)^t

**Math**

Classify the model as exponential growth or exponential decay. Identify the growht or decay factor and the percent increase or decrease per time period.

**chemistry**

what the balanved equation for gaseous sulfur dioxide reacts with water to form aq sulfurous acid (H2SO3)

**AP Biology**

I have two questions: 1. Why are action potentials usually conducted in only one direction along an axon? A. The axon hillock has a higher membrane potential than the terminals of the axon. B. The brief refractory period prevents reopening of voltage-gated Na+ channels. C. ...

**chemistry**

Calculate the pH at which the amino group of lysine is 20% dissociated. lysine side chain pka is 10.5.

**Calculus**

int(dx/(x^2+9)) u = x/3 Use the indicated substitution (above) to evaluate the integral. Confirm answer by differentiation. Okay, so I found that du/dx is 1/3. dx is 3du. Just by looking at the integral I can tell this is some form of tan^-1(x), if we change it to int(1/(x^2+9...

**Physics Please Help**

A spider sits on its web, undergoing simple harmonic motion with amplitude A.What fraction of each cycle does the spider spend at positions with x>0.75A? Hint: Use the analog of uniform circular motion.

**Physics Please Help**

A spider sits on its web, undergoing simple harmonic motion with amplitude A.What fraction of each cycle does the spider spend at positions with x>0.75A? Hint: Use the analog of uniform circular motion.

**US history**

thanks :)

**US history**

For what reasons was the Tweed Ring so notoriours?

**6th grade**

well what subject is it? maybe that could help

**social studies**

Thanks

**social studies**

How did the Chinese Exclusion Act nd the Gentleman's Agreement limit the Asian immigration?

**chemistry**

3.20/100=0.032

**3rd grade**

mr.mancho my great dane ate 125 hot dogs over a five day period. each day he ate seven more hot dogs than on the previous day. how many hot dogs did he eat on the first day.....

**math problem solving**

mr. mancho, my great dane, ate 125 hot dogs over a five-day period. each day he ate seven more hot dogs than on the previous day. how many hot dogs did he eat on the first day

**english**

did that help

**english**

My patient replied, back to me "I am good now and thank you very much."

**Calculus III**

x+3-(f) and use it in the verse vice way

**US history**

WE JUST COVERED THIS AT MY SCHOOL THE ANSWER IS 2

**math**

help people

**math**

what is 7 over 56 inn simplest form

**Math**

welcome i need help on my math Q so glad helped you

**Math**

did it help

**Math**

8+2=10+3=13 that's the answer

**US history**

its 1

**grade 4**

I am greater than 70 but less than 80. I am divisible by 4 and by 3.

**Physics Please Help**

A horizontal spring with k = 70 N/m has one end attached to a wall and the other end free. An 95 g wad of putty is thrown horizontally at 3.4 m/s directly toward the free end. Find the maximum spring compression.

**Science**

can u please help me unscramble "IRITONCF" and "LCRNEAU"

**chemistry**

What are the three chemical reasons for the large negative energy of hydrolysis of phosphoric acid anhydride linkage for compounds such at ATP, ADP, AND pyrophosphate?

**chemistry**

Can thermodynamic quantity, delta G, be used to predict the speed of a reaction in a living organism? Why and why not?

**Biochemistry**

the standard state free energy of hydrolysis of acetyl phosphat is G= -42.3 kJ/mol. Calculate the free energy change for the acetyl phosphate hydrolysis in a solution of 2mM acetate, 2 mM phospate and 3 nM acetyl phospahte.

**chemistry**

if 400 mL of 0.1 M NaH2PO4 is mixed with 100 mL of 0.1 M H3PO4 what is the pH of the buffer mixture? The PKa of H3PO4 is 2.1.

**Geometry**

How to solve: the measure of an angle is 12 less than twice the measure of its supplement. What is the measure of the angle?

**Anatomy**

A woman who recently came home from a tropical vacation now has abdominal pain and diarrhea. Her blood test results how an elevated eosinophil level. Which of the following organisms is most likely to cause her illness? A. Bacteria B. Worm C. Virus D. Fungus I think it's C...

**Physics Please help**

A 8.0×10−2 kg arrow hits the target at 25 m/s and penetrates 3.8 cm before stopping. What average force did the target exert on the arrow? What average force did the arrow exert on the target?

**physics**

that formula gets me a wrong answer...

**physics**

A 8.0×10−2 kg arrow hits the target at 25 m/s and penetrates 3.8 cm before stopping. What average force did the target exert on the arrow? What average force did the arrow exert on the target?

**Chemistry**

Anhydrous CuSO4 can be used to dry liquids in which it is insoluble. The CuSO4 is converted to CuSO4 x 5H20, which can be filtered off from the liquid. What is the minimum mass of anhydrous CuSO4 needed to remove 12.6 g H20 from a tankful of gasoline?

**Calculus**

(Another related rate question) A plane (alt. 4000ft) is flying west at 700ft/sec. A searchlight under its path, tracks it. How fast if the light pivoting when the plane is 1000ft east? --- Kind of similar to the lamp post question I posted earlier. I know dp/dt, 700ft/sec. We...

**Calculus**

(It's a related rate question) A man 6ft tall walks away from a lamp post (15ft) at 5ft/sec. How fast is his shadow lengthening? --- I have the picture, and the constants, the man and the lamp post. I have 5ft/sec as dw/dt, and I know I'm looking for ds/dt, the rate of...

**sentences**

Gold is measured in grams.

**Math**

Jane is 2mi offshore in a boat and wishes to reach a coastal village 6mi down a straight shoreline from the point nearest the boat. She can row 2mph and can walk 5mph. Where should she land her boat to reach the village in the least amount of time? I'm totally stumped by ...

**physics**

A vector representing 190 N is oriented at 38◦ with the horizontal. What is the magnitude of its horizontal component?

**Anatomy & Physiology**

A 32-year-old man has trouble tying his shoelaces, writing, and walking in a straight line. A computed tomographic (special x-ray) scan of the brain would likely reveal that the man has an abnormality in the A. cerebrum B. cerebellum C. brain stem D. diencephalon I'm not ...

**Anatomy & Physiology**

During an emergency room examination for an injured arm, the physician palpates the arm's entire length, starting at the shoulder and ending at the fingers of the hand. This process takes him from a/an ____ position. A. right to left B. proximal to distal C. anterior to ...

**Anatomy & Physiology**

A problem with the _____ plexus may cause pain in the posterior part of the thigh. A) Sacral B) Lumbar C) Cervical D) Brachial I'm thinking A but not quite sure

**Algebra**

the set of real numbers less than or equal to -4

**Math**

Find the solution to: Solve: 0.9x+9<_1.7x-8

**PSY 240**

I understand what sexual identity and sexual orientation are. That wasn't my question. The issue I am having is that my instructor is expecting a power point that summarizes the different perspectives on these topics. The problem I am having is that because it is an online...

**PSY 240**

Thank you Ms. Sue. While I'm still very confused about this assignment you are at least being more helpful than the instructor.

**PSY 240**

•Post a 5- to 7-slide Microsoft® PowerPoint® presentation summarizing the different perspectives on sexual orientation and identity. Here's my problem. I have read the entire chapter regarding this assignment and didn't come across any perspectives on the ...

**PSY 240**

Thank you.

**PSY 240**

What is the difference between the idea of set points versus settling points in relation to weight control? I've read and re-read the text and can't find any info regarding the idea of settling points. I'm a little bit lost and would like some help with this ...

**earth**

Plate Tectonic Theory: What evidence that supports this theory?

**earth**

Plate Tectonic Theory: What evidence that supports this theory?

**physics**

If a 10g bullet is fired from a 2000g rifle with a velocity of 500m/s at what velocity does the rifle recoil against the shooters shoulder??

**physics**

Moving At 20m/s,a car with a mass of 7.0x10^2kg collides with a stationary truck with a mass of 1.4x10^3 kg. If the two vehicles stick together resulting from the collision, what is the velocity of the combined car and truck?

**Com/220**

Thanks but I went to this and all I see is web site's? Not sure what you wan me to do? I was seeking help on how to get information on how to make a chart for education? I just don't know what I can use for this? I am looking for two of them? Pictures? Anything I can ...

**Com/220**

Hello I am stuck on trying to figure out my assignment on Incorporating Statistics, Graphs, and Illustrations. My topic I chose was on Education and I am not having any luck finding any pictures, graph's or anything on this topic that I can use. Is there anyway you can ...

**Algebra 1a**

Solve the following system of equations. x+3y=6 x=8-3y What is the solution of the system? Type the ordered pair or indicate if there is no solution. Thank you very much

**accounting**

Post a 200- to 300-word response to the following: You have been hired into a new company to oversee the accounting department. What type of financial reports would you expect to see in your department? How will you use the financial reports available to you to make business ...

**Calculus**

oh god. didn't even think about factoring. lol thanks

**Calculus**

How many critical points does the function f(x) = [(x-2)^5][(x+3)^4] have? A. 1 B. 2 C. 3 D. 5 E. 9 --- Ok, these are my thoughts on this question: My impulse was to do derivative of the function. However, if I'm going to set the function equal to zero to find some ...