# Posts by Jacob

Total # Posts: 889

**chemistry**

Use the table of complex ion formation constants to calculate the molar concentration of free Fe^2+ in 0.510M aqueous solution of potassium hexacyanoferrate(II) K4(Fe(CN)6) at 25 degrees celsius. I know the answer is 1.96*10^-6 m, but I'm at a loss on how to get there. I&#...

*March 28, 2017*

**Chemistry**

Urea, which has the chemical formula (NH2)2CO, is a fertilizer that can be prepared by reacting ammonia (NH3) with carbon dioxide (CO2). Given the following chemical equation, what is the theoretical yield of urea (in grams) if 4.16 mol ammonia is the limiting reactant? 2 NH3(...

*March 4, 2017*

**Science**

What is the identity of the precipitate that forms when 70 mL of 0.3 M BaCl2 reacts with 65 mL of 0.35 M Na2CO3

*February 27, 2017*

**Physics**

State the similarities between Coloumb's law And Newton's Law Of Universal Gravitation.

*February 17, 2017*

**Chemistry**

Fireflies flash at a rate that depends on the temperature. At 29oC, the average rate is 3.3 flashes every 10 seconds, whereas at 23oC, the average falls to 2.7 flashes every 10 seconds. Calculate the "energy of activation" (in kJ/mol) for the flashing process.

*February 5, 2017*

**Physics**

A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

*February 4, 2017*

**Math**

Order the following from least to greatest 0.3 3/5 0.66 2/3 0.35

*January 31, 2017*

**Linear Algebra**

(a) Use the triangle inequality: ||u + v|| <= ||u|| + ||v|| to prove that (i) ||u - v|| <= ||u|| + ||v|| (ii) ||u|| - ||v|| <= ||u - v|| (b) If ||u|| = 5 and ||v|| = 3, what are the smallest and largest possible values of ||u - v|| and ||v - u||?

*January 22, 2017*

**Linear Algebra**

Find the matrix of the following transformations: (a) Multiplication of the point (x, y, z) in ?^3 to give the point (x - y, y + 2z, x + z) (b) Reflection of points in ?^2 across the line in y = x.

*January 22, 2017*

**Math**

-1/2x-3greater than 8

*January 22, 2017*

**algebra**

Jane has $4.50 in pennies, nickels and dimes. She has twice as many pennies as she has nickels and dimes combined. How many of each coin does she have?

*January 20, 2017*

**english3**

Even a young actor can appear old through the ___ of stage makeup.

*January 18, 2017*

**english**

Pinocchio's lies cause his nose to grow, but when he ___ it returns to its usual size.

*January 18, 2017*

**math**

A bag contains 45 marbles of various colors. Jon draws 60 times, each time replacing the marble before drawing again. He gets a total of 12 blue marbles. Which is best prediction of how many blue marbles are in the bag?

*January 18, 2017*

**Math**

The table shows the results of a spinner with four colored sections. Use the table to answer the question. The spinner is spun 50 more times. Which is the best prediction for the number of times the spinner will stop on blue?

*January 18, 2017*

**math**

Brahim completed 18 free throws and missed 12. Using experimental probability, how many free throws is he predicted to complete in the next 100 tries?

*January 18, 2017*

** calculus **

Find the values for the following functions. If f(x)=2^x, show that f(x+3) -f (x-1)=15/2f(x) If G(x)= sin 2x, find G(0),G(1/4 pie),and G(7/8 pie)

*January 16, 2017*

**calculus**

Find the domain of the variable x for which the following equations determine y as a real function of x. If G(x)= sin 2x, find G(0),G(1/4 pie),and G(7/8 pie) can someone help me please!

*January 16, 2017*

**Math Help ;)**

Oh ok. I get it now. Thank you so much Ms.Sue. Have a wonderful day!

*January 13, 2017*

**Math Help ;)**

So, I've been stuck in these for quite some time.... can someone help me? Which ratios can form a proportion? A) 9/45 , 8/40 B) 8/12 , 12/21 C) 8/12 , 12/15 D) 9/22 , 14/28 I think it might be C but my brain is fried. Thank you so much, Jacob

*January 13, 2017*

**Physics**

A football is kicked at ground level with a speed of 17.7 m/s at an angle of 39.8 ? to the horizontal. How much later does it hit the ground? Answer=> t=_____ s Express your answer using three significant figures and include the appropriate units.

*December 15, 2016*

**Chemistry**

A 50.0 mL aqueous solution of sodium hydroxide has a pH of 12.50. If 36.00 ml of 0.0200 mol/L sulfuric acid is added to this sodium hydroxide solution, what will be the new pH of the resulting solution? Assume that the temperature stays constant at 25 C, and that the volumes ...

*December 11, 2016*

**Pre Algebra**

Thanks!

*December 7, 2016*

**Pre Algebra**

No so the answer would be -2. If so i get what I did wrong. For some reason I always make simple mistakes.

*December 7, 2016*

**Pre Algebra**

No -1 would be the answer

*December 7, 2016*

**Pre Algebra**

So the answer would be -64

*December 7, 2016*

**Pre Algebra**

I meant -8 instead of -5

*December 7, 2016*

**Pre Algebra**

N*-5 / -4=4 N*-5 = 8 N= -40

*December 7, 2016*

**Pre Algebra**

Please help this is really ergent.

*December 7, 2016*

**Pre Algebra**

A number is divided by -4, then multiplied by -5. The result is 40. What is the number? I had problem finding a formula for it. And this one was also like it. A number is multiplied by -8, then divided by -4. The result is 4. What is the number?

*December 7, 2016*

**Check my awns-The true cost of fossil fuels - Quiz**

Ahh

*December 7, 2016*

**Check my awns-The true cost of fossil fuels - Quiz**

When you say last one is wrong do you mean the one I commented ? Or the last one

*December 7, 2016*

**Check my awns-The true cost of fossil fuels - Quiz**

Thanks

*December 7, 2016*

**Check my awns-The true cost of fossil fuels - Quiz**

Which of the following is one benefit of recycling It increases the volume of solid waste. If it is recycled, and materials will not be biodegradable. It conserves resources and energy. It uses more raw materials that need to be mined. **?

*December 7, 2016*

**Check my awns-The true cost of fossil fuels - Quiz**

_________ is a solid fossil fuel that forms from plant remains. Coal ** Hydrocarbon Natural Gas Petroleum Air pollution can be controlled by Permitting more storm runoff. Burning more coal. Eliminating Sewage Putting scrubbers on power ** Formed how are fossil fuels? They are ...

*December 7, 2016*

**math**

Tommy walked 3 2/7 miles. write the distance Tommy walked as an improper fraction. A.4 B.4/3 <<my answer<< C.5/2 D.23/7 please tell me if B is right.

*December 6, 2016*

**Check My Answer Please**

Why were women fighting for suffrage? A:because they wanted to end abuse toward women B:because they wanted to win the right to vote**** C:because they wanted to gain the right to work D:because they wanted to end women's inequality Completely doing an educated guess right...

*December 5, 2016*

**math**

r is no less than 1 unit from 24

*December 4, 2016*

**PreCalc**

Suppose that $14,000 is invested in a savings account paying 5.2% interest per year. (a) Write the formula for the amount A in the account after t years if interest is compounded monthly.

*December 4, 2016*

**math**

Tony bought some stock for $504. If each share had cost $4 less he could have bought 3 more shares for the same $504. How many shares of stock did he buy

*December 4, 2016*

**algebra**

The diagonal and the longer side of a rectangular plot are together three times the length of the shorter side. If the longer side exceeds the shorter side by 140 ?feet, what is the area of the? plot?

*December 4, 2016*

**algebra**

Find the equation for the graph of the path of a point? P(x,y) that moves such that? P(x,y) is the same distance from the point ?(14?,0) and the? y-axis.

*December 3, 2016*

**Algebra**

Divide by long division (4x^3 - 2x^2 - 8x+3)/(x^2 +5) Please help I can't figure this out.

*December 1, 2016*

**Technology**

You smell like your ugly mama

*November 28, 2016*

**maths**

Using trigonometric ratios find the remaining side lengths and angle measurements to 2 decimal places each: (a) ? = 35°, ? = 90°, a = 30 (b) ? = 90°, b = 7, c = 6 (c) a = 33, b = 56, c = 65

*November 21, 2016*

**TASTY MATH!**

Why won't the cookies taste the same though...? I'm so confused. I've been doing this stupid test for hours

*November 17, 2016*

**Math**

Why do you have to use estimation to find the number of triangles you need for the string? I was wondering why this question is quite confusing and i was wondering if you can explain it to me in a way i can understand it. I'm not looking for an answer just a more simpler ...

*October 21, 2016*

**Chemistry**

0.5g of MG ribbon is reacted with 100ml of 1M HCL. The initial temperature of HCL is 20.4 degrees celsius. After the reaction the highest recorded temperature is 40.7 degrees celsius. Calculate the molar enthalpy of MG. I tried to find mol from HCl and then use nH=mcdeltat. ...

*October 17, 2016*

**Science**

Fuel can burn in the furnace.

*October 12, 2016*

**science**

no B

*September 30, 2016*

**science**

1. What is the main difference between mechanical and electromagnetic waves A. Mechanical waves involve transfer of energy; electromagnetic waves do not. B. Mechanical waves require a medium to travel in; electromagnetic waves do not. C. Mechanical waves have amplitude and ...

*September 30, 2016*

**MATHS**

The square of a number is 3 more than half the number.find the possible values of the number.

*September 28, 2016*

**English**

Yes kickass is right! 20/20

*September 23, 2016*

**Algebra**

Solve the system by elimination. X+y=4 X-y=-2 I can't figure this out please help

*September 18, 2016*

**Algebra**

Yes I got it now. Thanks so much for the help.

*September 14, 2016*

**Algebra**

The surface of the Grand Lake is at an elevation of 648 feet. During the current drought, the water level is dropping at a rate of 3 inches per day. If this trend continues, write an equation that gives the elevation in feet of the surface of Grand Lake after x days. I am ...

*September 14, 2016*

**Math**

If the perimeter of a rectangle is 70 feet what is the height to length of a ratio of 4:5

*September 14, 2016*

**Math**

A car leaves town traveling at 35 MPH. A 2nd Car leaves Town 2 hours later traveling in the same direction. In how many hours will the 2nd car be passing the first.

*September 7, 2016*

**Math**

A car leaves town traveling 35 MPH. Two hours later a 2nd car leaves, in the same direction traveling 55 MPH.In how many hours will the 2nd car be passing the first?

*September 7, 2016*

**Math**

A farmer had sheep and end.altogether 124 legs, how many sheep and hens

*September 5, 2016*

**physics**

A vertical container with base area measuring 12.3 cm by 13.7 cm is being filled with identical pieces of candy, each with a volume of 50.0 mm^3 and a mass of 0.0200 g. Assume that the volume of the empty spaces between the candies is negligible. If the height of the candies ...

*August 24, 2016*

**Thermodynamics physics**

A lead bullet moving at 204 m/s is stopped in a block of wood. All of the kinetic energy goes into heating the bullet. The initial temperature of the bullet is 25 degrees C. What is the final temperature of the bullet in degrees C

*June 16, 2016*

**leadership development**

1.Even though Mike is a great basketball player, he tries with just half effort on drills during practice. This is an example of A wasting talent B getting distracted C allowing others to set goals 2.Jim would like to get a summer internship, but his dad thinks he should work ...

*June 11, 2016*

**la language arts**

Joe magarac, Man of steel 8. In section 1, what does the author mean when he says joe magarac is a folk hero? A. Joe was a real man who spent his whole life in the steel mills of Pittsburgh. B. Joe was a mysterious figure who vanished without a trace.* C. Joe was a legend ...

*May 25, 2016*

**Chemistry**

Which of the following statements is true? All spontaneous processes are exothermic All non-spontaneous processes are exothermic All spontaneous processes release free energy*** Entropy always increases in a spontaneous process

*May 16, 2016*

**Chemistry**

The rate of a chemical reaction normally decreases as temperature increases is slowed down by a catalyst increases as reactant concentration increases*** decreases as reactant concentration increases

*May 16, 2016*

**Chemistry**

I meant to mark B as my answer sorry

*May 16, 2016*

**Chemistry**

Activation energy is the heat released in a reaction the energy barrier between reactants and products the energy given off when reactants collide*** generally very high for a reaction that takes place rapidly

*May 16, 2016*

**Health**

Both anorexia and bulimia can be treated by specific medications targeting eating disorders physiological therapy*** dieting personal trainers

*May 7, 2016*

**Health**

People who experience episodes of _______ are not eating out of hunger; they are acting out of behaviors associated with bulimia and depression anorexia starvation dieting binge eating*** fasting

*May 7, 2016*

**Health**

Which eating disorder might be discovered by a dentist anorexia bulimia*** starvation diet obesity

*May 7, 2016*

**Health**

Bulimia can be difficult to discover because most sufferers hide there condition and they tend to be a normal weight, sometimes overweight*** severely underweight slightly underweight obese

*May 7, 2016*

**Health**

_______ is a psychological eating disorder in which a person will binge eat and then purge there are no options for this one. I think it's bulimia but i'm not sure

*May 7, 2016*

**Health**

_________ commonly over-exercise, abuse laxatives, and refuse to eat in order to lose weight Bulimics Binge-eaters Anorexics*** Perfectionists

*May 7, 2016*

**Health**

Anorexia is considered a _______ disorder physical social predatory psychological***

*May 7, 2016*

**Health**

Individuals suffering from anorexia suffer extreme weight loss, usually _____ below the person's normal body weight 5% 8% 10%**** 15%

*May 7, 2016*

**Health**

Anorexia is a type of eating disorder that usually begins with young people with obese parents around the onset of puberty*** around the time they graduate high school who watch too much tv

*May 7, 2016*

**Language Arts**

shut up ms.sue

*April 26, 2016*

**physics**

A typical red blood cell subtends an angle of only 1.7×10−5 rad when viewed at a person's near-point distance of 25 cm. Suppose a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance of 13.0 cm . ...

*April 21, 2016*

**math**

Glenn raced his motorcycle 30 times last season. He finished first 12 times, second 5 times, and crashed in 9 races. What percent of the races did he finish second ? Set up as a proportion and solve

*April 19, 2016*

**AR**

How many 5-pound bags of apples can be made from 400 apples, each weighing ¼ pound?

*April 11, 2016*

**science**

i need someone to check my answers pless

*April 11, 2016*

**science**

anyone

*April 11, 2016*

**science**

Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its ability to change into...

*April 11, 2016*

**physics**

The lightbulb in the circuit shown in the figure has a resistance of 14 Ω and consumes 4.2 W of power; the rod is 1.18 m long and moves to the left with a constant speed of 2.9 m/s . The strength of the magnetic field is 2.2 T . Find the current that flows in the circuit...

*April 8, 2016*

**Algebra, Mathematics**

A $40 000 car depreciates at a rate of 13% per year. a) Write an equation to represent this situation. b) Find the value of the car in 3 years. c) How long does it take for the car to be worth half it's value?

*April 7, 2016*

**Physics (light)**

A soap film is viewed in white light. If the film is much thinner than the wavelength of blue light, what is the appearance of the film? The soap film appears totally transparent because it reflects no visible light. The soap film appears blue because all others colors are ...

*April 5, 2016*

**math**

The grass of a lawn grows slower the larger it gets. The length of the grass L is expressed in cm and the growth of the grass W in mm/day. If the grass is 2.7 cm tall at the end of day X, than it will be taller than 4cm 20 days later (assuming it will not be cut). this is a ...

*April 3, 2016*

**Chemistry**

using a 6.0M stock solution and a 2.5M stock solution, create two 0.01M solutions of hydrochloric acid with a 250mL volume

*March 25, 2016*

**math**

if 50,000 tons of freight imports came from japan and 200,000 came from the USA. Can you show the difference between the two in a percent? it says the the 50,000 tons from Japan is 30% less than what was imported from the USA which is 200000. But i can't seem to calculate ...

*March 20, 2016*

**Math**

at the end of 1999 you bought shares in a company for 100 euro. During 2000 the shares increase in value by 10%. During the 2001 the shares decreased in value by 10%. how much were the shares at the end of 2001?

*March 18, 2016*

**math.**

In Mrs. Harrington’s history class, 80% of the students speak English and 60% speak German. There are 30 students who can speak only one language. What is the maximum number of students who may speak both English and German in her class? so I think i'm supposed to ...

*March 16, 2016*

**Health ASAP HELP**

It's A. Maybe if you studied more and payed attention, it'd be more clear to you. Not trying to be mean, but that's how it is.

*March 14, 2016*

**Heath**

It's B.

*March 14, 2016*

**PHYSICS**

Nate the Skate was an avid physics student whose main non-physics interest in life was high-speed skateboarding. In particular, Nate would often don a protective suit of Bounce-Tex, which he invented, and after working up a high speed on his skateboard, would collide with some...

*March 12, 2016*

**Physics**

An unfortunate astronaut loses his grip during a spacewalk and finds himself floating away from the space station, carrying only a rope and a bag of tools. First he tries to throw a rope to his fellow astronaut, but the rope is too short. In a last ditch effort, the astronaut ...

*March 12, 2016*

**Math**

William rode his bike 20 miles in 2 hours. Lorie rode her bike 30 miles in 2.5 hours. If they both continue at the same rate, how many more miles will lorie travel in 4.5 hours than William?

*March 7, 2016*

**math algebra**

Can someone help me with this question? A can in the shape of a right circular cylinder is required to have a volume of 1,000 cubic centimeters. The top and bottom are made up of a material that costs 10¢ per square centimeter, while the sides are made of material that ...

*February 22, 2016*

**history**

What r the answers to the test

*February 19, 2016*