Monday

April 27, 2015

April 27, 2015

Total # Posts: 625

**Pre-Calc**

I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin ...
*April 13, 2015*

**Pre-Calc**

Thank you so much but are those the expressions or exact answers for the first two problems?
*April 13, 2015*

**Pre-Calc**

1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the expression as a trigonometric ...
*April 13, 2015*

**chemistry**

I have to do a lab on equilibrium, where you have to transfer water with two different sized straws, and answer questions based on that the questions are about the significance of where there is a flat line on the graph, and the significance of the point where the two lines ...
*March 19, 2015*

**chemistry**

Thank you so much!!
*March 16, 2015*

**chemistry**

I need an example of an elementary reaction to go with the definition An elementary reaction is a reaction in which reactants are converted to products in a single step.
*March 16, 2015*

**Chemistry**

for a project i had to make cards with words and then an example of those words, and i've done almost all of them, but I have a few words I need examples for activation energy activation energy activated complex elementary reaction
*March 16, 2015*

**Math (Pre-Calc)**

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that ∠A1 is smaller than ∠A2.) b = 74, c = 84, ∠B = 58&...
*March 13, 2015*

**Pre-Calculus**

I posted this question about an hour ago, got a response but still confused. Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers ...
*March 13, 2015*

**Pre-Calculus**

Thank you so much! I am just trying to figure out how to solve for b1. I am confused as to how you got the 1 and why you used 0.01851 when you said to use the two values for B to get B (the two values are 88.26 and 13.74)
*March 13, 2015*

**Pre-Calculus **

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that ∠B1 is smaller than ∠B2.) a = 34, c = 43, ∠A = 39&...
*March 13, 2015*

**algebra**

Ed Moura has $21000 invested in stocks paying 8%. How much additional money should he invest in certificates of deposit paying 4% so that the average return on the two investments is 5%?
*March 12, 2015*

**chemistry**

In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not sure how to ...
*March 12, 2015*

**chemistry**

if the concentration of all the reactants doubled, what works happen to the rate I know the reaction rate would increase, but in a previous example it asked the question and the answer was that the rate increases by 16 and I can't figure out how much it would increase for ...
*March 10, 2015*

**math 11**

Paula lent Ned $1200 to help him pay for a mountain bike that he desperately wants. She charged him 8%/a simple interest, payable weekly. Ned paid back the loan plus interest, in equal payments over 20 weeks. a) How much interest will Ned have to pay? [2 marks] b) What will ...
*March 4, 2015*

**math **

May Ling borrowed $2500.00 for vehicle repairs from her parents. She agreed to pay back the loan plus 7.5% simple interest on the $2500 added on in equal monthly payments over the next 6 months. a) How much interest will May Ling have to pay? [2 marks] Monthly rate = ...
*March 4, 2015*

**Physics**

Analyze the flight of a projectile moving under the influence of gravity (mg) and linear, i.e., laminar- flow drag (fD = bv, with b > 0 constant). Neglect \Phase I"; assume the projectile is launched from the origin at speed v1 and angle 1 above the horizontal. WARNING...
*March 2, 2015*

**Science**

You have a block of ice with a mass of 6.12 . The volume of the water is 100L and the volume of water when the ice is in the water is 106.66L. I subtracted 100.00 and 106.66 to get 6.66L as the volume of the ice What I'm confused about is how to divide 6.12 by 6.66 in long...
*February 23, 2015*

**science(sound#4)**

I don't understand it and I don't have any choices.
*February 18, 2015*

**science(sound#4)**

What instrument has a low pitch?
*February 18, 2015*

**science(waves)**

What do waves transfer?
*February 18, 2015*

**science(sound #3)**

Space has no air, what is another name for no air?
*February 18, 2015*

**science (sound #2)**

What temperature makes sound travel slower?
*February 18, 2015*

**science (sound)**

Okay thank you so much.
*February 18, 2015*

**science (sound)**

what temperature makes sound travel faster?
*February 18, 2015*

**science (aka sound)**

What are the 3 things that a medium can be in sound?
*February 18, 2015*

**science**

What are the 3 things that a medium can be?
*February 18, 2015*

**Math**

6 ounces
*February 18, 2015*

**chemistry**

What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. The pairs with similar colours were Ba2+ and Cu2+, and Sr2+ and Li+. Ba and Cu had light green-ish colours, and Sr and Li had red colours. I don&#...
*February 17, 2015*

**math**

A scale drawing of a city has a scale of 3 inches : 400 feet. What is the actual length of each foot in the drawing? Show the work.
*February 14, 2015*

**chemistry**

Which region of the color spectrum does 14 x 10^16 exist in? I can't figure out this question but I got all the others
*February 9, 2015*

**Social studies **

how did northern and southern responses to the fugitive slave law affect their relationship? A.it deepened on fear and anger B.it deepened the commitment to compromise C.it encouraged northern commitment to end plantation life D.it encourage southern commitment to expand ...
*January 29, 2015*

**Math**

PLEASE SHOW YOUR WORK OR EXPLAIN... Mr. Webb gave his waiter a $5.60 tip on a $40 bill. What percent tip did he give the waiter?
*January 21, 2015*

**Math**

PLEASE SHOW YOUR WORK.. Marty paid $72 for a jacket that had been marked down 20%. Create a linear model to represent this and use it to calculate the original price of the jacket.
*January 21, 2015*

**Math**

!!PLEASE SHOW YOUR WORK!! My recipe makes 96 cookies, but I'll only need 24 for the party, what will I multiply each ingredient by to make just 24 cookies? Explain.
*January 21, 2015*

**math**

Sin theta equals 5/12 in quadrant, find the exact value of cos 2theta. I'm not sure how to solve this question, I need some help.
*January 16, 2015*

**math**

rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the highest point. 1.what is the ...
*January 16, 2015*

**math**

how do you find the area of 7.3+13=?
*January 13, 2015*

**Math**

A search on colony of bacteria triples and links every 10 minutes it's links is now 1 mm how long will it be in 40 minutes?
*January 7, 2015*

**Physics**

A place kicker must kick a football from a point 33.0 m (about 36 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 48◦ to the horizontal. To...
*January 2, 2015*

**Physics**

a 1000 kg space craft at 500 m/s is on a collision course with a 400 kg satellite travelling at 700 m/s . Their paths are converging at a 45 degree angle . After the collision they remain locked together. What is the final speed of both satellites? What angle is this at
*December 12, 2014*

**Math**

The sum of the squares of three consecutive whole numbers is 77. Form a quadratic equation and hence solve it to determine the numbers. (Hint: let the three consecutive numbers be x, x+1 and x+2)
*December 7, 2014*

**Math**

Samantha wants to buy 6 roses 4 carnations and 8 tulips she estimates that she will spend about 14 dollars on these flowers do you agree math chapter 5
*December 1, 2014*

**Chemistry**

copper is a product of the reaction that occurs when dry ammonia is passed over a sample f heated copper(2) oxide.The equation for the reaction is given: 2NH3+3CuO=3Cu+3H2O+N2 Calculate the mass of copper produced if 0.12dm^3 of nitrogen is produced at room temperature and ...
*November 26, 2014*

**Pre algebra**

My problem says The cost of a cell phone for one month is a linear function of the numbers of minutes used. The total cost for 20, 35, and 40 additional numbers Re shown. Then it gives a table where it's 20/48$, 35/54$ and 40/56$ The first question is , Find the linear ...
*November 24, 2014*

**math**

The new athletic facility on the downtown campus measures 0.74 km by 0.4 km. how many square meters is the facility
*November 17, 2014*

**pre-algebra**

Wel-min makes a square quilt that has an area of 100 square feet.It has 25 square blocks, each the same size. What is the legth of each side of a block? A-2 feet B-4 feet C-6 feet D-10 feet
*October 30, 2014*

**Social Studies**

Number 2 is B
*October 30, 2014*

**math**

jenna says that no row or column cantains products with only odd numbers do you agree. explain
*October 27, 2014*

**math**

if you have 6 cars, 10 trucks, 14 suv, 15 minivan, at this rate how many trucks would pass luann if 90 vehicles passed her. show your work
*October 23, 2014*

**AP Calculus**

In the answer space below, provide the larger of the two positive integers that add up to 60 and have the largest possible product.
*October 16, 2014*

**AP Calculus**

If 600 cm2 of material is available to make a box with a square base and a closed top, find the maximum volume of the box in cubic centimeters. Answer to the nearest cubic centimeter without commas. For example, if the answer is 2,000 write 2000.
*October 16, 2014*

**Matt **

Are you sure
*October 9, 2014*

**S.O.S**

please I need to know
*October 9, 2014*

**science**

did I get those correct
*October 9, 2014*

**science**

3.If a gap in the fossil record exists between ancient and modern forms of a species, which of the following is the most appropriate conclusion? A. The gap indicates that gradualism must have occurred for the species to evolve from ancient to modern form.*** B. The gap ...
*October 9, 2014*

**S.O.S**

please help and with the other ones I just posted
*October 9, 2014*

**ms.sue **

is that correct please help
*October 9, 2014*

**science**

1.Darwin assumed that evolutionary change was always slow and gradual. What was the first evidence that suggested evolution change might happen fast sometimes? A. Homologous structures B. Fossils*** C. Reproduction rates D. DNA sequences 2.Which of the following provides ...
*October 9, 2014*

**math**

If a student scored an average of 60% on a test, what score would he/she need to average it out to a passing 80+. What formula would you use. This isn't a question on a test, it's one I've been trying to find. I am able to retake a test multiple times and will ...
*October 7, 2014*

**English**

I need some help with point for an essay in English about the great Gatsby. I have a question about development of character or interests, and I don't know how I could write about Gatsby in this idea. I also need the writers style and Fitzgerald's view and tone towards...
*October 7, 2014*

**math**

Wouldn't it be 20/46? Since 20+10+9+7= 46 which is the total of students. And since you are trying to find what percentage of them are 9th graders it's 20. So 20/46= 0.43 which is 43% So the answer is 43% of the students on the buss are 9th graders.
*October 6, 2014*

**Social Studies**

Did you get an a on this
*October 3, 2014*

**Science**

why is burning magnesium an irreversible reaction?
*October 3, 2014*

**science**

The chemical formula for copper sulfate pentahydrate is CuS4°H2O. Based on your observations, what do you think happens to this formula when the crystals are heated? In assuming that the answer has something to do with the h2o because when it's heated it becomes ...
*October 2, 2014*

**Chemistry **

-Describe the zero sum rule -True of False: The formula for the nitride ion is N^(-3) -True of False: The stock system shows the charge on the negative ion
*October 1, 2014*

**Math**

A ball is dropped from ten feet and caught after it touches the ground on the 30 th bounce, what is the distance traveled by the ball?
*September 23, 2014*

**Math**

Fern rounded to the nearest ten to estimate 548-132. She subtracted 540-130=410. Is Fern's estimate correct? Explain.
*September 23, 2014*

**math**

Daphne gave away 3 more than half her apples. She gave away 17 apples in all. how many apples did she have originally?
*September 22, 2014*

**physics **

A girl and the bike she is riding have a combined mass of 73.7 kg and are initially at rest but then she tosses the jug of water in her hand the forward direction. If the jug has a speed of 3.0m/s relative to the ground and the girl and bike move in the opposite direction at -...
*September 15, 2014*

**chemistry help!**

The Colorado River is diverted to flood fields. If the river is flowing at 17,600 ft3/s , how long will it take to flood a 5500 acre field to a depth of 2.00 meters? Note that 1 acre=43560ft2.
*August 25, 2014*

**Science (Physics)**

Thank you!
*August 3, 2014*

**Science (Physics)**

I will next time but I really need help with these questions, any help would be appreciated.
*August 3, 2014*

**Physics **

Two resistors 10ohms and 5ohms are connected in parallel across a 15V battery. What is the potential difference across the 10ohms resistor. I do not need the answer just the formula and how to figure out the problem. Thanks.
*August 3, 2014*

**Science**

There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving? A. 3 m/s B. 5 m/s C. 30 m/s D...
*July 14, 2014*

**Chemistry**

Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more compli- cated, but this is a reasonable first approxima- tion.) The combustion of carbon is described by the equation C(s) + O2(g) −→ CO2(g) ∆H◦ = −394 kJ What is ...
*May 22, 2014*

**Chemistry**

Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M. na= how do I calculate this? Ma= 0.2 M Va= 0.300 L nb= 0.5 mol Mb= 0.5 M Vb= ?
*May 13, 2014*

**language art pllz help**

A B C B B
*April 30, 2014*

**Chemistry**

HELP!! I'm doing an experiment to do with phosphorus and plant food and MgNH4P04 6H20 my air dry weight of MgNH4P04 6H20 was 1.31 g grams of P in plant food was .165 g % P in plant food is 13.87% % P205 equivalent to % P above is 63.02% % P 205 in 10-52-10 is 52% i then ...
*April 25, 2014*

**History**

Mark the statement if it describes Roman society during the time of Cincinnatus. A. Rome’s government was based on law in which many people had a voice. B. Rome was being surrounded and threatened by outside forces. C. People in Rome admired those who used their abilities...
*April 23, 2014*

**Chemistry**

Vitamin K is involved in normal blood clotting. When 1.05 g of vitamin K is dissolved in 25.0 g of camphor, the freezing point of the solution is lowered by 3.53 Â°C. The freezing point and Kf constant for camphor can be found here. Calculate the molar mass of ...
*March 26, 2014*

**Chemistry**

Given that the vapor pressure of water is 17.54 Torr at 20 Â°C, calculate the vapor-pressure lowering of aqueous solutions that are 1.90 m in (a) sucrose, C12H22O11, and (b) aluminum chloride. Assume 100% dissociation for electrolytes. I got .5799 Torr for sucrose, ...
*March 26, 2014*

**Math**

I forgot the - in the above answer that I gave. It should really be y+7=-2(x-2) y=-2x-3
*March 26, 2014*

**Math**

The key to perpendicular lines is that the slopes will multiply together to get negative one. Since your original slope is 0.5, your new slope will be -2. Passing through your stated points, the point-slope equation of the line will be: y-(y1)=m(x-(x1)) plug in your slope & ...
*March 26, 2014*

**Science**

Different climates and enviornments all together. A desert has very little water, so all the plants and animals are adpated to such conditions ex: cactus. What animals come to mind in the desert are mostly cold blooded reptiles. Forest ecosystems on the other hand, have just ...
*March 26, 2014*

**Physics**

What is it's original displacement? 100=k x 100=(500 N/m) x x= .2 M
*March 10, 2014*

**Science**

What did u make on this test
*March 5, 2014*

**Science~!**

It's b 1.faluse 2. B 3. A 4. A
*March 4, 2014*

**Art-plz check!!**

is kim right ???? someone answer me please i need this done in 3 mins??????
*February 13, 2014*

**Bronies**

What are bronies? I hear about it all the time. Does anybody know?
*February 11, 2014*

**unit rate**

482
*January 22, 2014*

**algebra 2 honors**

2x^2-12x+32=x^2 how would I solve this by factoring?
*January 5, 2014*

**algebra 2 honors**

2x^2-12x+32=x^2 how would I solve this by factoring?
*January 5, 2014*

**english**

is it possible to find evidence that could ever disprove a conspiracy theory? why/why not?
*November 15, 2013*

**algebra 2**

So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)
*November 10, 2013*

**algebra 2**

So I am doing my algebra home work and I get stuck on these three problems. x^2-19x+72 from there idk what to do because nothing multiplies up to 72 and adds up to -19. Same for this one. x^2-25x+48 And x^2+9-90 (X+15) (x-6)
*November 10, 2013*

**math**

A traveler went 10 miles south, 7 miles east, 2 miles south, and 2 miles west. How many miles is the traveler from the start?
*November 7, 2013*

**science**

I don't know
*October 30, 2013*

**AP chemistry**

001 (part 1 of 2) 10.0 points A 1.37-gram sample of compound X (of MW 88.0 g/mol) was burned in a bomb calorime- ter containing 1700 g of water. A temperature rise of 0.95◦C was observed. ∆Erxn for this re- action is −475 kJ/mol of X. What is the heat ...
*October 27, 2013*