Thursday

January 19, 2017
Total # Posts: 1,212

**Math**

the sum of two numbers is 27. one number is 3 more than the other number. write and solve a system of equations to find the two numbers. i understand the first equation but i don't know the other one.

*February 18, 2016*

**Math**

Jackie makes patterns. She makes each pattern with 5 counters. she makes 13 patterns. How many counters does she need? Show your working.

*February 18, 2016*

**Cal 2**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=1/x^3,y=0,x=4,x=7. About the y-axis. Volume =

*February 12, 2016*

**Social Studies**

Why do we celebrate black history month?

*February 11, 2016*

**math**

Thanks!

*February 9, 2016*

**math**

Problem: Lexington, and Elizabethtown, Kentucky are 79 miles apart. If the distance on the map is 2 1/2 inches, find the scale of the map. do i make a ratio for inches to miles? is it 2.5x inches = 79 miles?

*February 9, 2016*

**pre-calculus**

State the amplitude, period, phase shift, and vertical shift of the function y= -3 (1/2x- 2/3 pi)-4

*February 7, 2016*

**Chemistry**

The molarity of concentrated HCl purchased for laboratory use is approximately 12.1 M. How many milliliters of this reagent should be diluted to 1.000 L to make 0.100 M HCl?

*January 19, 2016*

**dynamics**

(a) A rocket is travelling out of the earth’s atmosphere. During flight it burns fuel at a rate of 80kg/s producing a constant thrust of 500kN which drives the rocket in a vertical trajectory. It has a mass of 3500Kg when it reaches a speed of 1220m/s. At this point in ...

*December 29, 2015*

**Statistics**

ln a box of 200 computer chips 30 of them are defective. lf 3 chips are chosen at random with replacement, what is the probability that at least one of them is defective?

*December 15, 2015*

**chemistry**

the number of moles in 12.04x10^23 molecules of Oxygen

*December 12, 2015*

**Walk two moons**

What is the meaning of the fourth message in your own words?

*December 9, 2015*

**health**

What are the ten building blocks for total health

*December 8, 2015*

**chemistry**

Stoichiometrics: a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. 3Ca(OH)2 + 2H3PO4 = Ca3(PO4)2 + 6H2O how many grams of calcium phosphate are produced? how many moles of Calcium phosphate are ...

*December 5, 2015*

**chemistry**

a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. how many grams of calcium phosphate are produced? how many moles of calcium phosphate are produced? how many moles of excess reagent remain? if 43...

*December 5, 2015*

**chemistry**

a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction.

*December 5, 2015*

**Chemistry**

Calculate the final temperature in degrees Fahrenheit of 1.25 liters of gas X at 85 degrees Celsius and 2700 mm/Hg, if the pressure is changed to 2.35 atmospheres and the volume is increased to 2500ml

*December 4, 2015*

**Chemistry**

if 16.5 liters of gas X is at 398 torr and -90.5 degrees celsius, what would be the volume of this same gas if the pressure is changed to 3.1 atmospheres and the temperature is changed to 399K

*December 4, 2015*

**Physics**

A stone is aimed at a cliff of height h with an initial speed of v = 36.0 m/s directed 75.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 6.25 s after launching. What is the height of the cliff?

*December 3, 2015*

**Chemistry**

50g*1mol/26.04g*2molh20/1molC2H2*18.02g/1molh20 69.20g H20 needed to make 50g c2h2

*December 1, 2015*

**physics**

So in projectile problems horizontal a=0 so the velocity is constant. So finding x and y components for initial velocity X: 172.5m/s*cos30=149.4m/s Y: 172.5m/s*sin30=86.25m/s The max height is at the apex of the projectile, so use vertical velocity in Vfy =Viy+at---> -vi/a=...

*December 1, 2015*

**physics**

A projectile is fired at 30.0° above the horizontal. Its initial speed is equal to 172.5 m/s. Assume that the free-fall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile? At what time ...

*December 1, 2015*

**Physics**

A person who is 1.1 m tall throws a ball with a speed of 5.2 m/s at an angle of 56 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2

*December 1, 2015*

**Physics**

The launching speed of a certain projectile is 6.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.

*December 1, 2015*

**Physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H = 32.0 m above sea level, directed at an angle theta = 46.9° above the horizontal, and with a speed v = 29.6 m/s. Assuming that air friction ...

*December 1, 2015*

**Science**

Well I'm not sure if you need it in MKS system or not but here is the conversion 66km/hr*1hr/60min*1min/60sec*1000m/1km =18.06m/s or .01806km/s Since the car is stopping its final velocity =0 Use the equation Vf=Vi+a*t (Where vf is final velocity vi is initial velocity a ...

*December 1, 2015*

**physics**

Hmm, I may be overlooking something here, unless the mass is irrelevant, but I drew Y0=0 V0=8.1m/s VF=0m/s( because the jumper reached Yf stops and comes back down toward earth) and a=9.8m/s^2 so you're looking for Y final position I used Vf^2=V0^2+2a(Yf-Y0) since vf=0 and...

*December 1, 2015*

**PHYSICS**

So this gives you the mass and force of m1, use Newton's second law (F=m*a) to get the acceleration.... 33.0/4.5kg=7.33 m/s^2 I drew this situation as [m1]----[m2] since the applied force was to the right the --- tension force becomes limp and should =0 [m1]>~~_[m2] it...

*December 1, 2015*

**math**

A: FUNCTION Q1. (a) The function C (x) = 25x + 80,000 express the total cost C (x) (in K£) of manufacturing x units of a product. If the maximum number of units which can be produced equals 20,000, state the restricted domain and range for this function. (b) An analysis ...

*December 1, 2015*

**math**

Well50k-27k=23k So since 8.5%interest is on Corp bonds 27000*.085=2,295 23,000*.068=1,564 3,859$ is the most he makes from interest Since it says maximum income look at the maximum amount he count spend on the higher interest rate then subtract from the total he wants to spend...

*December 1, 2015*

**Chemistry**

pH=Pka+log[A-]/[HA] Pka=-log 1.8x10-5 +log (.025/.053) Divide the concentrations out and take the log of it and add it to the negative log of 1.8x10-5 You can tell HC2H3O2 is the acid because Ka is the constant for the acid, while Kb would be constant for the base. I don't...

*December 1, 2015*

**biology**

Which of the following organelles is common to both prokaryotic and eukaryotic cells? Cytoskeleton Nucleus Nucleolus

*November 30, 2015*

**algebra**

A wire is 264 ft in length is to be cut into two pieces, one to form a rectangle whose length is four less than twice the width, and the other to form a square whose side is equal to the sum of the width and the length of the rectangle. how long is the shorter piece of wire

*November 29, 2015*

**c programming**

Write a program to read from a file called "input.txt" information about 5 workers. Each line would contain two values respectively, an employee ID and the employee's monthly salary. Assume that the data from the input file is stored in a format as shows in this ...

*November 26, 2015*

**Calculus**

Let f(x)=5x^(9/5)−45x^(4/5). Find the largest open interval(s) where f(x) increases.

*November 23, 2015*

**Math**

Let f(x) be a function such that f′(x)=x(ln|x|)^2. Find the open interval(s) in which f(x) is concave down . In interval notation, f(x) is concave down in ___________

*November 23, 2015*

**Algebra**

James walked 212 miles in 23 of an hour. What was his average speed, in miles per hour?

*November 21, 2015*

**conversions**

How to calculate the square meters of a roll that is 30500 LF x 117" x 75 gauge

*November 20, 2015*

**Physics**

A thin spherical shell of silver has an inner radius of 8.74 x 10-2 m when the temperature is 29.4 °C. The shell is heated to 145 °C. Find the change in the interior volume of the shell.

*November 15, 2015*

**Physics**

A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.324 m on a side, is subjected to two shearing forces, each of magnitude F = 6.93 x 10 5 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.

*November 14, 2015*

**Grammar check**

Hello, can you please check my answer. Which of the following sentences is written in the subjunctive mood? A. If the sun is shining, then I will wear sandals. B. It was the weekend, so she slept until noon. C. My health teacher recommends that I eat five servings of ...

*November 11, 2015*

**Math**

A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are ...

*November 9, 2015*

**Statistics**

A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are ...

*November 9, 2015*

**Statistics**

Researchers wish to determine if a new experimental medication will reduce the symptoms of allergy sufferers without the side-effect of drowsiness. To investigate this question, the researchers give the new medication to 50 adult volunteers who suffer from allergies. Forty-...

*November 9, 2015*

**physics**

Two blocks with masses M1 = 8.0 kg and M2 = 5.4 kg are connected with a massless string over two massless and frictionless pulleys, as shown in the Figure. One end of the string is connected to M1 while the other end is fixed. What is the acceleration of mass M2?

*November 4, 2015*

**Sixth grade math**

The sum is 1.7 and the product is 6.3. What are the numbers?

*November 3, 2015*

**LA check work**

ok thank you for the second question I believe it would be A then

*November 3, 2015*

**LA check work**

Hello could you check my work on these two questions? Question one: How do you form the perfect tense of a verb? A. use the helping verb will and the base form of the verb B. use a form of the verb have and the present particle of the verb C. use a form of the verb have and ...

*November 3, 2015*

**algebra**

With an 80 km/h head wind a plane can fly a certain distance in 4 h. Flying in the opposite direction, with the same wind blowing, it can fly that distance in one hour less. What is the plane’s speed?

*November 2, 2015*

**Calculus III**

What is the velocity vector of a particle traveling to the right along the hyperbola y=x−1 with constant speed 1 when the particle's location is (4, 14). (Use symbolic notation and fractions where needed. Give your answer in the form of comma separated list of i, j ...

*October 22, 2015*

**math homework**

Find the all the possible values for x if there are any so that the graph of the function has a horizontal tangent. y(x)=x^4-4x+4

*October 18, 2015*

**English**

What's the correct capitalizations for, the henderson family moved to chicago from the east coast.

*October 5, 2015*

**English**

thank you very much.

*September 24, 2015*

**English**

Hello which sentence is correct? I'm not sure. as I had learned much from garfield high school. or I have learned much from Garfield high school. Should I use had or have? thank you

*September 24, 2015*

**Math.**

A jet is travelling at 600 miles per hour. Determine the velocity of the jet in meters per second

*September 21, 2015*

**Physics**

An aerialist on a high platform holds onto a trapeze attached to a support by an 9.8-m cord. (See the drawing.) Just before he jumps off the platform, the cord makes an angle of 37° with the vertical. He jumps, swings down, then back up, releasing the trapeze at the ...

*September 17, 2015*

**math**

The track is 1/8 a mile

*September 15, 2015*

**math**

Jacob is jogging around a track. Th track is a mile. How many laps will he have to jog to make 3 miles? Is it 24 laps

*September 15, 2015*

**Statistics/probability**

Not sure

*September 13, 2015*

**english 9**

Who was Mary Elizabeth Lease?

*September 8, 2015*

**math**

x-54

*September 8, 2015*

**english 9**

What was the goal of the Americanization movement?

*September 8, 2015*

**World Geography**

1.5

*September 2, 2015*

**algebra**

Price # of pizzas 1.50 1 3.00 2 4.50 3 6.00 4 each pizza costs 1.50 so you add on 1.50 to each slice of pizza you buy

*September 1, 2015*

**math**

Find x 1) 6log(down)10 x=1.6 2) e^-4x=1.943 3) 1.3x10^-4 x=4.7/x -6.3x10^-3 4) 6lnx=1.6 5) x^2¡Ñ23y^2 = 1.78x10^32¡Ñz please help I really can't solve this problem.

*August 30, 2015*

**Science**

It's essential to remember acceleration as a vector ( having magnitude/size and direction) So the plane taking off is the easy one to mark off, a cheetah running 27m/s east could be assumed it's speed is constant and not accelerating, a car stopping at a stop sign has ...

*August 27, 2015*

**Science**

Which of the following is not an example of acceleration. A a person jogging atn3 m/s along a winding path B a car stopping at a stop sign. C a cheetah running 27m/s east D a plane taking off

*August 27, 2015*

**math**

Sandra wants to buy some chocolates as a gift to her friend . Each bar of chocolate is worth Php. 75.00 Question : a.Write the equation . b.What is the constant of variation ? c.How much did she pay if she buy 7 bar of chocolates ?

*August 25, 2015*

**physics**

A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?

*August 22, 2015*

**math sqrt root**

1) x¡Ô2x + 2¡Ô2x^3 + 2x^2/¡Ô2x Ans 4x¡Ô2x 2) (1/2)^1/3 Ans 3¡Ô1/2 = 3¡Ô4 /2 3) ¡Ô2/3 Ans ¡Ô6/3 4) 3¡Ô2/3 Ans 3¡Ô18/3 5) ¡Ô2 + 1/¡Ô2 ...

*August 18, 2015*

**math**

2/9 divided 15/4 divided 4/12

*August 14, 2015*

**physics**

The mass of meter stick= 151.77g but with 3 sig figs it's roughly 152grams (47.7g)*(38.5cm-10.5cm)=(47.3cm-38.5cm)*(Mass of meter stick) Simple algebra given the information, hope this helps!

*July 29, 2015*

**sociology**

Studies show that people from higher socioeconomic backgrounds tend to live longer and report feeling healthier than people from the lower classes. What are some explanations for this phenomenon? please help

*July 28, 2015*

**sociology**

How does one¡¦s place in the socioeconomic system affect their ability to achieve the American Dream?

*July 28, 2015*

**psychology**

<11{1[4(23)23]}> People have claimed that Jamie’s paintings have given them the blues. Clearly this cannot be entirely correct, since many of Jamie’s paintings contain no blue at all. The argument above is flawed because the author:

*July 9, 2015*

**sociology**

can you copy and paste some information for me please? I couldn't get access to sing up for that website.

*July 7, 2015*

**sociology**

Every discipline that does research on humans needs a code of ethics in order to protect its research subjects. While it¡¦s easy to see that medical research could harm people if not carried out ethically, the risks associated with sociological research are more ...

*July 7, 2015*

**science**

A force of 16.0 newtons is sufficient to set a box that is at rest into motion. If the coefficient of static friction is 0.380, what is the normal force acting on the box?

*June 24, 2015*

**biochemistry**

anyone by any chance know what it means for a protein to be "n-terminally truncated"? I know that the n-terminus is supposed to be like one end of the protein chain...

*June 14, 2015*

**math**

A motor pulley 8 inches in diameter and runs at 450 revolutions per minute.Find the diameter of the fan if the RPM's is 1,400? Round to the nearest hundredth.

*June 8, 2015*

**Computer Lit**

Does this look good? It's about Piracy and my position. Computer Piracy What is piracy? Are there pirates running around on the Internet? Piracy is theft, you’re stealing copyrighted work. You’re not stealing if you buy a book, a song on iTunes, or a movie off of...

*June 4, 2015*

**Spanish**

thank you

*May 27, 2015*

**Spanish**

Hello how would I say"There are plants around the lake" in spanish.

*May 27, 2015*

**Pseudocode**

Produce the algorithm for the problem above [this will include five “get” statements to input item 1, item 2, item 3, item 4 and item 5; three math statements to process the subtotal, tax and total; and three “display” statements to output the subtotal, tax...

*May 11, 2015*

**Chemistry**

My teacher is an idiot and wont teach our class and im panicking so please help anyone. Given the following equations enthalpy values, determine the heat of reaction (kj) at 298k for the reaction: B2H6(g)+6Cl(g)=2BCl3(g)+6HCl(g)

*May 10, 2015*

**10th grade physics**

What speed must a bucket of water have to complete a circle with a radius of 1.2 m without spilling any water? My answer: this seems to be an incomplete question, not solvable without the weight of the bucket

*May 1, 2015*

**English vocab**

If you receive someone's mail, then you seize it before the person receives it; however, it is illegal to take someone's mail, so the police might attempt to arrest you and put you in jail.

*March 27, 2015*

**English**

Can you find the word passage which matches the meaning given. (a) knocked about, pushed off balance (b) another choice

*March 25, 2015*

**Physics**

A 130kg mail bag hangs by a vertical rope 3.9m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut.

*March 21, 2015*

**Shakespear**

what is the mood of anticipation?

*March 21, 2015*

**Physics**

A 130kg mail bag hangs by a vertical rope 3.9m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut.

*March 21, 2015*

**Math**

Hi! I need help with this question. Thanks! Directions: Try to find the number of solutions for the following system of equations then determine if it is Dependent, Inconsistent or Consistent. -3x-2y=6 x=-2-2/3y

*March 18, 2015*

**Spanish**

I'm doing a project. That's my title which one would be better "Mi futuro hogar" or "Mi futura casa"

*March 14, 2015*

**Spanish**

ok thank you

*March 14, 2015*

**Spanish**

Hello how do I say "my future house" in spanish. I didn't want to use google translate because of the grammar.

*March 14, 2015*

**physics**

A chair of mass 14.0kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 40.0N that is directed at an angle of 43.0∘ below the horizontal and the chair slides along the floor.

*March 14, 2015*

**Math**

A bus can cover a distance of 6 miles in 1 gallon of gas. The cost of gas is $4 per gallon. What will be the cost of gas used in driving the bus for 96 miles?

*March 12, 2015*

**projectile motion physics**

There is a minimum angle above the ground such that if the ball is launched below this angle, it can never clear the bar, no matter how fast it is kicked. What is this angle?

*March 8, 2015*

**projectile motion physics**

Imagine the ball on the left is given a nonzero initial speed in the horizontal direction, while the ball on the right continues to fall with zero initial velocity. What horizontal speed vx must the ball on the left start with so that it hits the ground at the same position as...

*March 8, 2015*

**physics**

wo vectors A⃗ and B⃗ have magnitude A = 3.02 and B = 3.03. Their vector product is A⃗ ×B⃗ = -5.05k^ + 2.06 i^. What is the angle between A⃗ and B⃗ ?

*March 7, 2015*