Tuesday

July 22, 2014

July 22, 2014

Total # Posts: 113

**Math**

Helping grandson with math. I would like to know how to do it before he does. "How many different rectangles can be made with a perimeter of 20 units? (Remember, a square is also a rectangle.)"

**Physics **

A skater rotates 880 degrees clockwise, stops, and rotates counterclockwise for 340 degrees. What is her angular distance? Angular displacement?

**us history**

In many ways after the divisiveness and devastation of the Civil War, the United States searched for order economically, politically, geographically, socially and racially. Select one of these areas, or suggest another, and make a case for the reasons why it was the most vital...

**algebra**

steps to (.15x)+(-.3x)=

**Math**

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions 12 in by 12 in by cutting out equal squares of side x at each corner and then folding up the sides as in the figure. Express the volume V of the box as a function of x.

**Math**

Find an expression for the function. Top half of the circle: x^2+(y-2)^2=4.

**Math**

A cylindrical can with both a top and bottom has the same surface area as a cube with edge 50mm. The height of the can if 6cm. Find the radius of the can to the nearest thousandth.

**Chemistry**

Rank the following from most polar to least polar (aspirin, caffeine, ibuprofen, acetaminophen): I am getting caffeine>acetaminophen>aspirin>ibuprofen. Is that correct?

**Math**

Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. cos x = x. How do I begin this problem? According to the theorem, a=0, b=1 and N=x?

**Math**

Use the Intermediate Value Theorem to show that there is a root of the given equation in the specified interval. x^4+x-3=0, interval (1,2). According the to theorem, I found that a is 1, b is 2 and N is 0. f(1)= 2 and f(2) = 17. Is the root (1.16,0)?

**Math**

Use a graph to find a number delta such that if abs(x-pi/4) < delta then abs(tanx-1) < 0.2. I understand that the epsilon is 0.2. But what step do I take next? How do I solve the problem?

**Math**

Prove that lim (x->0) x^4 cos 2/x = 0.

**Math**

Answer check please: Consider the circle (x-3)^2 + (y+1)^2 = 169. The point (15,4) is on the circle. Find an equation for the line that is tangent to the circle at this point. I got y= 5/12x-9/4.

**Math**

An oil tank is the shape of an inverted right circular cone with the pointed end down. The tank is 15 feet tall and is 12 feet in diameter at the top. At 1:00pm, the tank has oil 5 feet deep in it. Oil is pouring in at 5 cubic feet per minute. To the nearest minutes, at what t...

**Math**

A truck tire with a diameter of 36 in is rolling over level ground spinning at 11 rotations/second. If the speed limit is 55 miles per hour and the penalty is $20 per hour over the speed limit, should the driver be fined and if so, how much?

**Math**

An isosceles triangle has its vertex at the origin and the ends of its base on the parabola y=9-x^2. Express the area of the triangle as a function of the length of its base. Assume its base lies above the x-axis.

**Chemistry**

How many milliliters of a .5M HNO3 (aq) is needed to completely neutralize 100mL of a 0.10M KOH (aq)?

**algebra2/trigonometry**

a bank teller has 52 $5 and $10 bills in her cash drawer. the value of the bills is $460. how many $5 bills are there?

**algebra**

a bank teller has 52 $5 and $10 bills in her cash drawer. the value of the bills is $460. how many $5 bills are there?

**chemistry**

Which of the following pairs can be used to prepare a buffer? (select all that can apply) a. HCl/NaCl b. HF/KF c. NH3/NH4Cl d. HNO3/HNO2 e. NaNO2/HNO3 can you also please explain how they form a buffer? thank you

**math**

Jamal buys 59 stickers. Stickers come in packs of 5 or 8. How many packs of 5 stickers does Jamal buy? 8 stickers?

**Biology**

Which of the following would be the most sigificant between mitosis and meiosis? A. Chromosomes are duplicated before mitosis B. Meiosis is not followed by cytokinesis C. Homologous Pairs of chromosomes are split up in meiosis. D. Crossing over occurs in mitosis. So far i got ...

**Math**

Greta said that the product of two prime numbers must also be a prime number. Joan disagreed. Who is correct?

**Math**

Thank you so much!

**Math**

There are 189 students in the band. The difference between the number of boys and the number of girls is 27. How many boys and girls each are in the band?

**Math**

Thank you so much !!!!

**Math**

Jun-Jee either ran 5 or 7 miles each day for 30 consecutive days. His total mileage during this period was 166> How many days did he run 5 miles? How many days did he run 7 miles?

**math**

Thank you

**math**

If there are 264 students in a school and there are 84 eighth graders and There are 22 fewer seventh graders than sixth graders. Then which grade has the most students and how many students are there.

**chemistry**

CH4 + 2O2 ---> CO2 + 2H2O Delta H H2O= -285.8 kJ/mole Delta H CO2= -393.3 kJ/mole What is the standard heat of formation of methane, Delta H CH4, as calculated from the data above

**trig**

5. If the angles X and Y each measure between 0° and 90°, and if sinX = cosY, what is the sum of the measures of the angles X and Y?

**geometry **

How would you write that line segment PK has equal length with line segment OQ?

**geometry**

Thank you:) I got x=12 too but I wanted to make sure I was correct.

**geometry**

If FD=4x-27, and SG is congruent to FD and SG=2x-3, Then whais the length of SG?

**algebra**

You could demonstrate the process with an example by replacing the equal sign in the example with an inequality by using the less than or greater than sign (< or >) Then solve the inequality by your example. :)

**Statisitcs**

since the mean is a parameter of interest, it is a better estimate.

**Animal Skeletal and Muscular Systems**

wich of the fallowing muscles are used when breathing?

**Animal Skeletal and Muscular Systems**

wich of the fallowing muscles are used when breathing?

**algebra**

-rs^3-r^3s=

**chemistry**

Suppose the following: HO-C(H2)-C(H2)-OH + 2 HI --> I-C(H2)-C(H2)-I + water How many mL of the first compound* are needed to react with 9.3 grams of HI? (The density of the first compound is A = 1.11 g/mL) *by first compound, i mean HO-C(H2)-C(H2)-OH

**pre cal 2 **

solve the equation 4cos^2x-1=0

**pre cal 2**

verify the identity tanx times cotx/cosx=secx

**pre cal 2**

find the exact solutions in the interval [0,2pi), sin4x=-2sin2x

**Math**

Thankyou Sir for helping me. I am studying for my tcap exam and some of the stuff on the test we didnt have time to cover because it snowed so much and we couldnt go to school.I think I no what I am looking for now. You have been a bunch of help.

**Math**

What addition property can you use to find the missing number? 8+(6+5)=8+(5+_)

**Statistics**

20

**us history**

My paper is on 3 reasons I would stay and fight 1. with so many men being sick or dying, I will stay and fight 2. freedom doesn't come cheap and anything of value is worth fighting for 3. the Congressional Committee that G. Washington brought over to Valley Forge will now ...

**us history**

I'm writing a paper about re-enlisting during the American Revolution, even though I'm miserable with the sick and dying all around me. I need to come up with a good grabber to start my paper with. Can you help?

**Economics**

How would a communist economy react to social and technological changes? What is the role of nature in a communist economy? I can't find any information on these subjects. Could someone please help me? Thanks so much

**hcs/335**

I do not understand it either. I cannot give the answer because I really don't know where to start. My confusion is in the culture, does it mean the "organizational culture", which could be the philosophies, values, etc... or the culture of the people in the orga...

**math**

1.Robin has a certain number of dimes in his pocket. If the dimes were pennies, he would have $1.08 less than he has now. How many dimes does he have in his pocket?

**math**

1.Robin has a certain number of dimes in his pocket. If the dimes were pennies, he would have $1.08 less than he has now. How many dimes does he have in his pocket?

**Math**

A class has 12 students. In how many different ways can the students be put into lab groups consisting of 3 students in each group. The answer in the book is 369600. But I do not understand how they got this answer.

**Math percentages**

I have to compare two amounts given in percent. Last year, 80% of a cafe's sales were coffee; this year only 20% of the cafe's sales are coffee. How much has the percent of coffee sales changed over the past year. Is the answer simply down by 60% or is it more complica...

**college**

6.25 is correct

**Physics**

A 7.0 kg bowling ball moves at 2.40 m/s. How fast must a 2.60 g Ping-Pong ball move so that the two balls have the same kinetic energy?

**physics**

A 726 kg car travels from Boone to Blowing Rock along US321. How much working is needed to keep the car traveling at a constant speed of 21.8 m/s around a curve of radius 28.4 m?

**Physical Chemistry**

The equilibrium constant for a reaction was measured at several temperatures and the data plotted at right. The slope and y-intercept of the plot are +3.25 kK and -4.04, respectively. Calculate ΔrH(std), ΔrS(std), and ΔrG(std) using this information.

**Physical Chemistry**

A 100 amino acid folded protein (F) is in equilibrium with it’s unfolded (U) (or denatured) form. Let ΔrH(std) =+347 kJ mol-1 and ΔrS(std) =-1010 J K-1 mol-1 for the equilibrium (F U) at 25℃. (a) Calculate the concentration of protein in each form if the t...

**Physical Chemistry**

Calculate the standard reaction Gibbs energy of the oxidation of ammonia to nitric oxide according to the equation 4 NH3g) + 5O2(g) → 4 No(g) + 6 H2O(g).

**physical chemistry**

Calculate the equilibrium constant (K) for the ammonia synthesis reaction at 25°C and show how K is related to the partial pressures of the species at equilibrium. Consider that the overall pressure is low enough for the gases to be treated as perfect. N2(g) + 3H2(g) ->...

**math**

If the ratio of onions to cilantro is 4:3 and I'm using 2/3 cup of onions, how much cilantro will I need?

**Math**

Fireworks are fired at an angle of 82degrees with the horizontal. They are expected to explode about 100 m in the air, 4.8 secs after they are fired. What is the initial velocity of a shell fired from ground level. I think I have to find the vertical and horizontal components ...

**Physics**

An artillery shell is fired with an initial velocity of 300 m/s at 65.0° above the horizontal. To clear an avalanche, it explodes on a mountainside 37.5 s after firing. What are the x and y components of the shell where it explodes, relative to its firing point? x = ______...

**Physics**

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 21.0 m/s. The cliff is h = 60.0 m above a flat horizontal beach. A)How long after being released does the stone strike the beach below the cliff? B)With what speed and angle o...

**college**

need help with miscrosoft excel 2010 spreadsheet IS 160

**science**

Provide specific examples from the Bridger Teton video as you defend your position.

**math**

a rabbit climb up a flight of 10 stairs and can only hop 1 or 2 steps each time. he never hops down, only up. How many ways can the rabbit hop up the flight of 10 steps?

**biology**

how is emigration and immigration not important factors when studying global human population growth?

**algebra**

list all the possible rational zeros of f using the rational zero theorem. then find all the zeros of the function. 1. f(x)=x^2-6x+5 2. f(x)=x^3+x^2-10x+8

**biology**

why is it important to understand challenges in a species' environment in order to understand the species' evolution? Relate your answer to what Darwin referred ti as "the struggle for survival".

**english**

In the book, When the Legends Die, what does it mean when Tom draws the deer in the dirt?

**social civics**

the three basic types of government: mayor-council plan, the commission, and the manger-council plan. give at least one strength and one weakness for them . and size of city where most effective thanks alot i cannot not seem to find this in my book

**college**

What are the three most important points you think a group of people must keep in mind when working collaboratively on a writing project? Why? Support your response with references to readings and personal experiences.

**Math**

Thanks.

**Math**

I'm having trouble with reciprocal functions. If a graph of a reciprocal function is given, how do you find its equation? Any help would be really appreciated.

**Algebra**

I need this question put into an equation. I have been working on this forever and cannot figure out! Please explain what you did. Thanks so much for your time! Mark sold 105 tickets for the basketball game. Each adults ticket cost $2.50 and each child's ticket cost $1.10....

**Biology**

1. A famous scientist once said that wherever in the universe life exists, some of those life-forms must be colored. Why would the scientist make such a statement? 2. One of the accessory pigments used in photosynthesis is beta-carotene, a carotenoid found in high concentratio...

**history**

can u please give me a site tht will have a short but an informative article on the English Reformation? thnks

**Physics**

Thanks!

**Physics**

If a ball is sliding along a frictionless horizontal surface is the total work being done on the ball zero? I think so because there is no mention of applied force. Am I correct? P.S. On this holiday weekend, I want to send a BIG THANK YOU to all the teachers who very generous...

**Physics**

Thank you very much!

**Physics**

Thanks. Is this the only way to calculate because in our lesson we only learned the formula for work =fd? We've haven't done KE yet.

**Physics**

I don't know where to start with this one. "Find the work done accelerating a 2 kg box from 2m/s to 3 m/s." Can't find acceleration because I don't know time. In fact, I don't see how any of the kinematic equations can help me out to find either dista...

**Physics**

Thank you so much!!!

**Physics**

I have a follow-up to my question at 4:10 about work because I still can't figure it out. F-F(friction)=ma F-F(friction)=2*3 F-2.5=2*3 F=2*3 + 2.5 W=Fd W=(2*3 + 2.5)4 Distributing the "4" I get W=2*3*4 +2.5*4 Please help in pointing out where I have gone wrong. ...

**Physics**

Help!I'm really lost on this one.

**Physics**

Calculate the work done by the applied force accelerating a 2 kg object at 3 m/s/s over 4 m if there is a 2.5 frictional force of resistance. I calculated using F=ma=6N; then net force = 6N-2.5N=3.5 N so W=fd=14J. Did I do this correctly? Thanks

**Physics**

You guys are great! Now I get it!

**Physics**

I'm having a hard time with some free body diagrams. If you have a box on a slope/ramp and the angle of the ramp is X degrees why is it that the angle between the normal force and the gravitational force is also X degrees? Am I missing something obvious here?

**Physics**

Thanks. This explanation really helps me.

**Physics**

I'm comparing the "g-force" of a rocket and a race car. My answer for the race car corresponds to the answer in the book but my answer for the rocket is off by 1. The book says I need to add 1 G because the rocket is going upward. So, instead of my answer of .87 ...

**physics**

Thanks to you both!

**com 220**

Why would it benefit you to try various sites rather than just get used to one? Why is it good advice to look for content as well as the date of the publication?

**sales tax**

swaetshirts are on sale for 26 dollars and are 15% off. what is the sales price before tax

**english**

Can soneone help me to combine each of the following groups of simple sentences into two longer sentences. Thanks 1. Darryl works as a model. He has to look his best. He gained ten pounds recently. He had to take off the extra weight. He would have lost his job. 2. My aunt dec...

**Algebra 1b**

Factor completely 100r^2 + 160rt + 64t^2

**Algebra 1b**

Find all numbers for which the rational expression is undefined. p^3 - 4p/P^2 - 4

**Algebra**

What does it mean to refer a 20-in television set or a 25-in TV? Such units refer to the diagonal of the screen. A 20-in set also has a width of 16 inches. What is the height?

**Algebra**

Jack usually mows his lawn in 4 hours. Marilyn can mow the same yard in 7 hours. How much time could it take for them to mow the lawn together?