Wednesday

February 22, 2017
Total # Posts: 3,274

**maths**

solve the system of equations algebraically for real values of x and y { x+u=16 x^2 +y^2 =128

*August 30, 2016*

**calculus**

find the inverse of the matrix. [ 16 1 ] 1 16

*August 26, 2016*

**calculus**

Find the product [ 3 8 ] [ 4 5 ] 6 3 4 4

*August 26, 2016*

**calculus**

Find A - B A = [ 3 7 8 ] 7 9 3 7 9 9 B = [ 2 2 6 ] 6 7 8 5 8 6

*August 26, 2016*

**math**

if a patient walked 1/4 mile sun, 1/3 mile mon, 1/2mile tues, 7/12 mile wed, 3/4 mile thurs, 5/6 mile fri, and 1 fll mile sat, how many miles did the patient walk in a week?

*August 24, 2016*

**Social Studies**

Yea, Fred's answers are correct.

*August 22, 2016*

**Social Studies**

2 3 4 5

*August 19, 2016*

**Math**

Find an A.P. such that the sum of the first three terms is one half the sum of the next four terms, the first term being 12.

*August 18, 2016*

**Chemistry**

Determine the cell potential from the following half cells: Pb^o/Pb2+ and ZN^O/Zn2+ whre [Pb2+]=.86Mand [Zn2+]=0.35M Calculate K for this reaction. How long in hours would you have to let it go until you lower the voltage to 95 percent of the E from the Nernst equation at 7.2?

*August 14, 2016*

**pre cal**

The vector u = 94300, 5200) gives the number of units of two models of laptops produced by a company. The vector v = (1800, 1200) gives the price in dollars of the two models of laptops, respectively. Identify the vector operation used to increase revenue by 5%

*July 16, 2016*

**Pre Calculus**

The number of new accounts opened at a credit union in the years 2001 to 2006 can be approximated by the model N(t)= -80.6t^2+2100t+12000, where 11 <= t <= 16, with t = 11 corresponding to 2001. Using this model and your graphing calculator, determine the year in which ...

*July 4, 2016*

**Math**

Let R be the region bounded by y = ln x, x-axis, and x = 3. Answer the following. a) Write, but do not solve, an integral expression that will find the volume of the solid that results from rotating R about x = -2. b) Write, but do not solve, an integral expression that will ...

*June 23, 2016*

**Calculus**

Thank you so much!

*June 23, 2016*

**Calculus**

The base of a solid is the region bounded by the lines y = 5x, y = 10, and x = 0. Answer the following. a) Find the volume if the solid has cross sections perpendicular to the y-axis that are semicircles. b) Find the volume if the solid has cross sections perpendicular to the ...

*June 23, 2016*

**Just a random question that I'm interested in.**

All right, thanks!

*June 20, 2016*

**Just a random question that I'm interested in.**

Do Kayan women enjoy wearing the neck rings? From Kayan.

*June 20, 2016*

**Math**

An object moves along the path x^2 - y^2 = 5. At the point (-3, 2),dx/dt = -4. Find dy/dt at that same point. I understand that dy/dt of the function is y' = x/y but I am not sure how to find it at that specific point. Could you please help? Thank you!

*June 18, 2016*

**College Intro To Geography**

Discuss the ways in which geographers employ the ideas of distance, accessibility, and connectivity to describe the process of spatial interaction. The spatial interaction would be how people, or even animals, interact with each other. For instance how well do we connect with ...

*June 16, 2016*

**English**

The title "another evening at the club" is close in meaning to "just another evening at the club" given the events of the story, what is the significance of this meaning? I need help explaining this. I have no idea how to word it

*June 16, 2016*

**CHEMISTRY**

If you used only photons that were dropping from the n = 6 shell to the n = 1, how many of these photons would be required to keep a 100 Watt light bulb lit for 10 minutes?

*June 13, 2016*

**Chemistry**

how do I convert 5E-26 to Meters 60mph is 26.8224m/s I am having trouble in how to write it out (9.109E-31kg)(26.8223) or am I dividing the 5E-26 from the 26.8224?

*June 13, 2016*

**Chemistry**

If you were told that a ball had a wavelength of 5 x 10-26 nm at a velocity of 60 mph, what would be the mass of that ball in pounds?

*June 13, 2016*

**Math**

A fair coin is flipped four times. What is the probability that tails occurs exactly 3 times if it is known that tails occurs at least twice?

*June 8, 2016*

**Science**

Shale often contains fossils of leaves. Question: If the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils what would their possible age be? Question: Could you use radiocarbon dating to assign a numerical date/age to this rock unit? ...

*June 6, 2016*

**Science**

I'm doing research but I can still not find it.

*June 6, 2016*

**Science**

what the definition of age range in earth science?

*June 6, 2016*

**Science**

okay, and how about this question. Why Devonian could not be considered an index fossils?

*June 6, 2016*

**Science**

how? why?

*June 6, 2016*

**Science**

I still don't understand.

*June 6, 2016*

**Science**

The text above^^ is for this question: How can the occurrence of fossils and their known age ranges be used to date rocks?

*June 6, 2016*

**Science**

Fossil Occurrence and the Age of Rocks: Groups of fossil organisms occur throughout the geologic record for specific intervals of time. This time interval is called the fossil’s range. Knowing the range of the fossils of specific organisms or groups of organisms can be ...

*June 6, 2016*

**Science**

Why Devonian could not be considered an index fossils? How can the occurrence of fossils and their known age ranges be used to date rocks? Need help by understanding the question.

*June 6, 2016*

**Science**

I don’t understand the question, help?

*June 6, 2016*

**Science**

How can the occurrence of fossils and their known age ranges be used to date rocks?

*June 6, 2016*

**Math ~ CHECK ANSWER**

Below are two sets of student quiz scores on a 30-point quiz. Which of the following can you conclude by comparing their box-and-whisker plots? Class A: 5, 10, 13, 18, 19, 25, 29 Class B: 1, 3, 5, 7, 9, 9, 13 a) The first quartile of class B is greater than the third quartile ...

*June 2, 2016*

**chemistry**

In a certain experiment, the rate constant, k, was measured as a function of the temperature, T. Two data points were as follows: (A) 25°C, 1.1 x 10–5 min–1, and (B) 225°C, 2.4 x 10-2 min–1. The student who performed the experiment then ...

*June 1, 2016*

**Chemistry**

At 425°C, a reaction has a rate constant of 7.7 x 10–4 s–1 and has an activation energy of 275 kJ mol–1. What is the frequency factor? The answer is 2.9 x 1017 s–1 , I need help with working out I used arrhenius equation and rearranged ...

*June 1, 2016*

**Geometry**

Which is the equation of a 20 cm diameter circle with its center at (3, -6)? (x+3)^2+(y-6)^2=100 (x-3)^2+(y+6)^2=400 (x-3)^2+(y+6)^2=100 <my choice (x+3)^2+(y-6)^2=400

*May 27, 2016*

**Math**

Suppose f (0) = 9, f ′(0) = 2, and f ″(0) = -4. If df is used to approximate Δf when Δx = 0.01, which of the following would be true? df < Δf df > Δf df = Δf

*May 26, 2016*

**Math**

Thank you so much!

*May 24, 2016*

**Math**

A rectangle is bounded by the x-axis, the y-axis, and the line y = (4-x)/4. Find the maximum area of such a rectangle.

*May 24, 2016*

**Math**

Suppose f (x) = x^3 + x and g(x) = f^-1(x). Find g'(2). I am confused about how to find the inverse of f because I can't isolate y. Could you please help? Thanks!

*May 24, 2016*

**physics**

In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 94 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad

*May 23, 2016*

**math**

Eufj j reh g d

*May 22, 2016*

**Math**

OK I don't know where to start 4 (2/4) × 4

*May 20, 2016*

**Math**

#1) 8/10 +1/3 = 34/30= 1 (4/30) Is my answer OK #2) 2/5 ÷1/3= 6/5 = 1 (1/5) Is my answer OK #3) 2/5 ÷ 1/3 =6/5= 1 (1/5) Is my answer correct

*May 20, 2016*

**Math**

#1) which digit is 10 times the value in the underline digit in 36,119,432 (#that is underline is number 1 between the 1 and 9 ) I think the answer is one hundred thousand #2) which digit is 1/1000 of the value in the underline digit in 19,832,456 (# underline is 3) My answer ...

*May 20, 2016*

**Math**

#1) Luis stated that when you are converting meters to centimeters your answer will be larger than your original number. My answer is yes because centimeters are smaller . (Is my answer OK ) #2) 8/9 + 1/3= 33/27= 1(12/27)= (I'm stuck here) #3) 6/8-2/6=2 (18/20) =2 (9/10) ...

*May 20, 2016*

**math**

I get 39.85

*May 19, 2016*

**History**

The political order of the 19th century, at the time combined people of many nationalities who wanted their own governments.

*May 19, 2016*

**History**

single most powerful European political ideology of the 19th and early 20th centuries political outlook, nationalism was and is based on the relatively modern concept that a nation is composed of people who are joined together by the bonds of common language as well as common ...

*May 19, 2016*

**History**

How did nationalism threaten the existing political order of the nineteenth century?

*May 19, 2016*

**Geometry**

Two similar triangles have a scale factor of 3 : 5. The altitude of the larger triangle is 24 inches. What is the altitude of the smaller triangle?

*May 16, 2016*

**geometry**

Questions 1 and 2 are wrong. 1. is triangular pyramid the other one is 2. is solid

*May 13, 2016*

**Physics**

A model rocket is launced from the ground with an initial velocity of 65 m/s directly upwards. If a horizontal wind is blowing at 5 m/s during the flight, how far from the launch point will the rocket land? I know I should probably be using the equation x=x0+v0t+1/2at^2, but i...

*May 12, 2016*

**math**

Nevermind. I figured it out. Key was 1 ppm is 1mg/L. 1.15 mg/L * 100,000 L = 115,000 mg (115g)

*May 12, 2016*

**math**

How many gram of sodium fluoride should be added to 100000 liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm? Answer is 115 grams. I keep getting .115 g What am I doing wrong? Please help.

*May 12, 2016*

**Chemistry**

If 27 grams of propane react with 88 grams of oxygen to make carbon dioxide and water then how many grams of carbon dioxide can be made?

*May 11, 2016*

**ss**

1.B 2.A 3.D 4.C 5.A 6.C 7.D 8.B 9.C 10.A 11.D 12.A 13.C 14.A 15.D 16.C 17.B 18.C

*May 11, 2016*

**chemistry**

if an ideal gas has a pressure 2.47 atm, a temperature 86.78C and has a volume of 23.83L how many moles are in the sample

*May 4, 2016*

**Physics**

an artist designs a mobile of light horizontal rods connected by vertical strings and supporting various shaped weights. Find the magnitudes w2, w3, and w4 if w1= 1.00 unit of weight. The numerical values given in the figure all have units of length.

*May 2, 2016*

**geography**

what are the causes of poor service delivery

*May 1, 2016*

**chemistry**

What is the concentration of IO3- (total volume: 20mL) when you have .00001mol of HSO3- (total volume: 10mL)? Use the balanced equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3SO4^2-(aq)+3H+(aq)

*May 1, 2016*

**chemistry**

How to find the moles of IO3- reacted when you have .00001mol of 10mL HSO3-? Using the equation IO3-(aq)+3HSO3-(aq)>>>I-(aq)+3SO4^2-(aq)+3H-(aq)

*May 1, 2016*

**Science Check answers**

2) What phenomenon naturally warms Earth's lower atmosphere and surface? • the formation of sunspots • changes in the shape of Earth's orbit • global warming (MY ANSWER) • the greenhouse effect 3) Which of the following is an example of human impact...

*April 29, 2016*

**History**

Explain the impact of the Balfour Declaration on the Middle East. Explain the impact of the Japanese attack on Pearl Harbor.

*April 27, 2016*

**chemistry**

Use PV=nRT to find n, the moles of hydrogen gas. V= 1.68x10^-2 L P= 715 torr-VP of water at 25C (about 25 torr; look it up in Wikipedia) T= 298.2K R = Applicable value for the above units.

*April 27, 2016*

**Science- Density**

I'm having difficulty understanding density. I am trying to relate the concept of density to brownies. Should a brownie with baking soda have a higher or lower density compared to a brownie with no baking soda? Does a thick brownie mean a high or low density? When it says ...

*April 24, 2016*

**Physics**

A military gun is mounted on a railroad car (m = 1500 kg). There is no frictional force on the car, the track is horizontal, and the car is initially at rest. The gun then fires a shell of mass 30 kg with a velocity of 300 m/s at an angle of 40° with respect to the ...

*April 23, 2016*

**Physics**

two particles of mass m1=1.5 kg, and m2=3.5 kg undergo a 1-dimensional head-on collision. Their velocities along x are V1i=12 m/s, and V2i=-7.5 m/s. The 2 particles stick together after the collision. a.) Find the velocity after the collision. b.) How much kinetic energy is ...

*April 23, 2016*

**Physics**

A skier of mass 110 kg travels down a frictionless ski trial. a.) If the top of the trail is a height 200m above the bottom, what is the work done by gravity on the skier? b.) Find the velocity of the skier when he reaches the bottom of the ski trail. Assume he starts form ...

*April 22, 2016*

**Math-Trig**

Answer to four significant figures, or to the nearest minute. f) one vertex angle of a rhombus is 25°. Find the ratio of the diagonals.

*April 18, 2016*

**Statistics life orientation**

Yes

*April 14, 2016*

**Math**

John can paint a room in 3 hours. His apprentice, working alone, requires 6 hours to do the same job. How long would it take John and his apprentice, working together, to paint the room if they continue to work at the given rates?

*April 14, 2016*

**algebra**

find the amount of an annuity that consists of 22 monthly payments of $800 each into an account that pays 2% interest per year, compounded monthly.

*April 12, 2016*

**Language arts unit 3 lesson 5 second read**

1.A 2.A 3.B 4.B 5.D

*April 11, 2016*

**PHYSICS!!**

The answers are: a)6.79 m/s b) 55.2J Not too sure on how to get these answers!!Please Help!

*April 11, 2016*

**PHYSICS!!**

Squids and octopuses propel themselves by expelling water. They do this by taking the water into a cavity and then suddenly contracting the cavity, forcing the water to shoot out of an opening. A 6.50 daN squid (including the water in the cavity) that is at rest suddenly sees ...

*April 11, 2016*

**physics**

A spring has an unstretched length of 10 cm . It exerts a restoring force F when stretched to a length of 12 cm . For what total stretched length of the spring is its restoring force 3F? At what compressed length is the restoring force 2F? I keep doing this but I do not think ...

*April 11, 2016*

**math**

Anna is designing rectangular garden that has an area of 182 square feet, and the length is longer than the width. The table lists the possible whole number dimensiones for the garden. Which dimensiones are missing?

*April 4, 2016*

**home economics management**

What are the careers in home economics

*April 4, 2016*

**Physics**

What is the potential energy, in joules, of a spring with a force constant of 6 N/m when it is stretched 20 cm from its unstretched length

*March 31, 2016*

**Geometry**

A segment with endpoints (3, -2) and (4, 2) is dilated to the image segment with endpoints (9, -6) and (12, 6). What is the scale factor for the dilation? 3 2 6 **my choice 9 **i feel its this one too, im stuck

*March 31, 2016*

**Biology**

Which organelle would you expect to find in the cells of a fern, but not in a flatworm? chloroplast **my choice nucleus ribosome mitochondria

*March 31, 2016*

**English**

Lol ok

*March 29, 2016*

**English**

Why does the Rabbi's son abandon his father on the march to Buchenwald? He believes his father is better off without him. He wants to be free from the responsibility of his father. He doesn't want to tell his father he doesn't believe in God. <~my choice He ...

*March 29, 2016*

**math**

You are dealt one card from a standard 52-card deck. Find the probability of being dealt a card greater than 2 and less than 7. I got 5x4=20/52=5/13

*March 28, 2016*

**math**

The length of a rectangular piece of steel in a bridge is 4 meters less than triple the width. The perimeter of the piece of steel is 56 meters. Find the length of the piece of steel. Find the width of the piece of steel.

*March 22, 2016*

**math**

An automobile tire has a diameter of 63 cm. What is the circumference of the tire? (Use pi equals3.14 as an approximate value.)

*March 22, 2016*

**math**

This table shows the distances and time wade walked in two days. Friday 1.5 miles 0.5 hours Saturday 1.15miles 0.4 hours on which of these days did wade walk at a faster rate?

*March 20, 2016*

**math**

6 points above par is represented by a negative number

*March 19, 2016*

**math**

two cruise ships sail from NY to FL.ONE ship make the round trip in 8 days.the other ship make the round trip in 10 days.both ships sail from ny today.which is the fewest number of days before both ships will sail again from newyork on the same day?

*March 19, 2016*

**math**

if a number line is divided into 8 equal parts,then each part represents %

*March 19, 2016*

**math**

sade found that 75% of 60 is the same as 30% of another number,n.what is the value n?

*March 19, 2016*

**math**

Aj bought a portable game system on sale for $150.the portable game system was 70% of the regular price.aj concluded that the original price of the portable game system must have been $225. Aj correct? justify your answers part b is 70% of an original price the same 30% of an ...

*March 19, 2016*

**Algebra**

A rectangular lap pool has a constant depth. The length of the pool is 9 times the width, and the surface area of the water is 81 square feet. What are the dimensions of the pool? Include units.

*March 17, 2016*

**History**

magine you work in a steel mill in a large industrial city in England in the late 1800s. You live in a neighborhood with other factory workers, and share the same living and working conditions they do. Write a letter to your representative in Parliament expressing your ...

*March 16, 2016*

**math**

Sam cut the pie into 6 pieces

*March 15, 2016*

**physics**

Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...

*March 15, 2016*