Tuesday

May 3, 2016
Total # Posts: 1,875

**TRIGONOMETRY**

Evaluate the expressions: a) arctan(-sqrt(3)) a) Arctan(-sqrt(3)) So, I know how to find the answers with a calculator, but how do I find it step by step?
*May 18, 2013*

**Physics**

2 factors that increase static friction? Could it be weight or the ground?
*May 18, 2013*

**TRIGONOMETRY**

Yeah, I figured it out once I posted it. Sorry for that! But thanks for responding anyways. I misread read the question. You've been a huge help actually explaining these answers. I'm feeling really good about my final! :)
*May 18, 2013*

**TRIGONOMETRY**

Use the dot product to determine which of the following vector pairs are orthogonal. a. v1 = (-5,5) and v2 = (1,1) b. v1 = (154,169.4) and v2 = (88,64)
*May 18, 2013*

**TRIGONOMETRY**

Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
*May 17, 2013*

**TRIGONOMETRY**

I'm sorry, I mean could you convert w= 1+sqrt3i to polar coordinates. I already did the other. My bad.
*May 17, 2013*

**TRIGONOMETRY**

I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
*May 17, 2013*

**english**

Yeah, I'm sorry, I don't understand what you're "asking", Anonymous.
*May 17, 2013*

**english**

Are you asking if the sentence has correct grammar? If so, no revision is required.
*May 17, 2013*

**TRIGONOMETRY**

Can someone please show me step by step how to calculate the modulus and the argument for these complex numbers? I have a trig final next week and I am trying to finish this study guide so I am prepared. Thank you so much! If you can, please show my how you get the answer so I...
*May 17, 2013*

**TRIGONOMETRY**

y/r!! That makes much more sense! Someone else had told me y/x, so that's why it didn't work. Thanks!
*May 16, 2013*

**TRIGONOMETRY**

3. The rectangular coordinates of a point are given. Find the polar coordinates of each point. b. (0,3) I figured out a, but I canNOT figure out b. Can someone please explain? :)I need to know how to do this for my final next week.
*May 16, 2013*

**Math **

1- 75 is what percent of 500? 2- 30% of 30 is wat #? 3- 90% of wat num is 207?
*May 16, 2013*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each ...
*May 16, 2013*

**TRIGONOMETRY**

Thanks, Steve! :)I appreciate your help!
*May 16, 2013*

**TRIGONOMETRY**

Can you check my work, please? This is for a trig study guide for my final next week. I'd like to know if I'm doing this right. :) 2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) ...
*May 16, 2013*

**TRIGONOMETRY**

I tried converting (0,3) myself, but I can't seem to get your answer. What am I doing wrong? b. (R, theta) R = sqrt(x^2 + y^2) R = sqrt(0^2 + 3^2) R = 3 theta = arctan y/x theta = arctan 3/0 theta = 1.249 = (3, 1.249)
*May 16, 2013*

**TRIGONOMETRY**

Aaah, so those are the formulas! I'll remember those. That helps so much! You're awesome! Thank you for not just giving me the answers. The point of a study guide is to study and know how to get to an answer. Usually people just give the answer without showing the ...
*May 16, 2013*

**TRIGONOMETRY**

Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
*May 16, 2013*

**Math**

A mixture of petrol and oil for a two stroke lawn mower contains 85% petrol, how much oil is required for 18 litres of the fuel mixture?
*May 16, 2013*

**Physics helpp**

Newtons 2nd law The force of earths gravity is about 10 N downward. Whats the acceleration of a 15kg backpack if lifted with a 15N force??
*May 14, 2013*

**Physics**

And how do i find the mass if its missing? Formula?
*May 14, 2013*

**Physics**

Newtons second law What net force acting on a 14kg wagon produces an acceleration of 1.5 m/s^2?
*May 14, 2013*

**history**

Sorry it was a typo, but thank you.
*May 13, 2013*

**history **

What does this quote mean? "It is honorable to be raised to a throne than to be born to one. Fortune bestows (gives) the one, merit obtains to other." -Francesco Petrarch
*May 13, 2013*

**English**

Does this sentence have correct parallelism? Using steam power helped people spin cotton and grind flour.
*May 10, 2013*

**Social**

Thanks alot
*May 9, 2013*

**Social **

What are the goal and practices of mormons?
*May 9, 2013*

**Physics**

1- you push a coin across a tabble, the coin stops. How does this motion relate to balanced and unbalanced forces?
*May 7, 2013*

**Physics**

Which causes an object in motion to stay in motion? A) friction b) gravity C) inertia D) velocity Its not friction..
*May 7, 2013*

**science**

what happens to the G-force as the speed of the centrifuge increases?
*May 5, 2013*

**Chemistry**

why is it important to know accurately the mass of water used in a calorimeter?
*May 5, 2013*

**Statistics**

The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score on the math portion of the test. That is, both...
*May 3, 2013*

**statistics**

A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were X = $640 and s = $20, what is the best interval estimation?
*May 3, 2013*

**chemistry**

Methane gas is burned releasing Carbon Dioxide into the atmosphere. How much CO2 (g) is released if 78.5 Liters of Methane is burned? CH4 + O2 --> CO2 + H2O
*May 1, 2013*

**Calculus**

A particle moves along the curve y = sqr(1+x^3). As it reaches the point (2,3), the y-coordinate is increasing at a rate of 4cm/s. How fast is the x-coordinate of the point changing at that instant?
*May 1, 2013*

**art history**

What is the Etruscan influence on Roman, Byzantine and Romanesque visual culture?
*April 30, 2013*

**English**

1. If you are filled with anticipation about an event, you are (1 point) ***looking forward to it. planning to avoid it. hoping to delay it. 2. Read the following excerpt from Sky: We finally reached Enkhuizen, an ancient harbor town, where the brisk wind from the sea was ...
*April 28, 2013*

**Science question**

It is right microwave. Only certain types of microwaves use batteries. All phones, radios, and definately flashlights use batteries.
*April 23, 2013*

**math**

the product of 2 consecutive integers is 156. find the integers. I found them mentally 12 and 13 but, how do I find them while solving?
*April 18, 2013*

**math**

thanks
*April 11, 2013*

**math**

If the first of 1000 consecutive whole numbers is odd, their sum must be a) even b) odd c)prime d) negative Help?
*April 11, 2013*

**Math**

Two investments are made totaling $4800. In the first year they yield a total of $412 in simple interest. Part of the money is invested at 8% and the rest at 9%. Find the amount invested at each interest rate.
*April 11, 2013*

**Chemistry**

If you wanted to prepare 50.0 mL of hydrogen, collected over water at 25 C on a day when the barometric pressure was 730 torr, what mass of aluminum would you react with a hydrochloric acid? (Balance the equation first.) ___Al(s)+___HCl(aq)=___AlCl3(aq)+___H2(g)
*April 8, 2013*

**Chemistry**

A sample of iron reacted with hydrochloric acid. The liberated hydrogen occupied 40.1 mL when collected over water at 27 C at a barometric pressure of 750 torr. What is the mass of the sample of iron? (Because of the collection of gas over water, the vapor pressure of the ...
*April 8, 2013*

**Chemistry**

What volume of hydrogen, measured at 25 C and 1.00 atm can be produced by dissolving 5.0 g of magnesium in hydrochloric acid? (Write and balance the equation for the reaction first.)
*April 8, 2013*

**Chemistry**

Instead of a strip of pure Mg ribbon, you are accidentally given a strip of an aluminum-magnesium alloy. You calculate the mass of the strip as above. Would the mass of the strip be higher or lower than expected? Write the appropriate chemical equations (one equation for the ...
*April 8, 2013*

**Chemistry**

If the strips of MG ribbon are coated with white MgO, would this cause the mass of Mg that you calculate to be too high or too low? Why?
*April 8, 2013*

**Chemistry**

If your partner did not take into account the vapor pressure of water when calculating the moles of hydrogen produced, would the mass of Mg that was calculated at the end of the experiment be too high or too low? Why?
*April 8, 2013*

**la**

shoud students who fail their classes be retained and have to repeat the grade ?
*April 2, 2013*

**la**

shoud students who fail their classes be retained and have to repeat the grade ?
*April 2, 2013*

**chemistry**

Use the molar volume to find the volume, in liters, of 6.40g of O2 at STP.
*April 1, 2013*

**Pre-Algebra**

How many different ways can you choose 3 frozen yogurt toppings from 20? 6,840 1,140 60* 2,260 I think it is 60 because 3*20 however not positive.
*April 1, 2013*

**Finance **

They will need 200,000 in 18 years and they can expect a rate of return of 6 %. How much will they need to invest annually. I would have set it up and gotten $70068.76 but then do you divide by 18?
*March 28, 2013*

**science**

During condensation, what must be changed, temperature or heat energy?
*March 25, 2013*

**chemistry**

N2(g)+H2(g)-NH3(g) Calculate the volume of ammonia gas produced when20cm3 of nitrogen gas was reacted with an excess of hydrogen gas
*March 25, 2013*

**physics**

A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south at a speed of 8.1 ...
*March 24, 2013*

**Algebra**

for colorado connections its C, B, C, C, D
*March 19, 2013*

**maths**

(b) A stone is thrown straight up with velocity 14 m s-1 Calculate (i) The time taken for the stone to reach the top of its motion (ii) The time taken for it to reach the ground again (iii) The maximum height it reaches (iv) What is the velocity of the stone at height 8.0 m?
*March 13, 2013*

**maths**

(a) A car accelerates from 0 to 30.0 m s-1 in 6.0 seconds, travels at a constant 30.0 m s-1 for 21.0 seconds, and then brakes to a stop in 3.0 seconds. (i) Draw a velocity-time graph illustrating this motion (ii) Calculate the acceleration (assumed constant) in each section of...
*March 13, 2013*

**maths**

(c) Given that 1 inch = 2.54 cm exactly, express the speed of light, 3.00 „e 108 m/s, in (3 marks each) (i) ft/ns (ii) mile/s
*March 13, 2013*

**maths**

onvert the following to scientific notation: (i) the distance to the sun, 149 500 000 000 m (ii) the wavelength of yellow sodium light, 0.000 000 5893 m (iii) the radius of an atom, 0.000 000 000 2 m
*March 13, 2013*

**maths**

Evaluate (3.00¡Á¡¼10¡½^12 )¡Á(2.40¡Á¡¼10¡½^(-20) ))/(8.00¡Á¡¼10¡½^(-1)
*March 13, 2013*

**Math**

How do you solve negative exponents?
*March 10, 2013*

**Math**

How do you solve negative exponents?
*March 10, 2013*

**chemistry**

A sample of oxygen that occupies 1.00x10^6 mL at 575 mm Hg is subjected to a pressure of 1.36 atm. What will the final volume of the sample be if the temperature is held constant? How would I set up this equation?
*March 4, 2013*

**science**

Q: which of these conditions is least likely to cause a species to become extinct due to environmental changes? A: -less genetic variation -more genetic variation -specific food preferences -more competition for food
*March 3, 2013*

**HELP! LANG ARTS??**

yes it is definately B
*February 27, 2013*

**science**

HeLp Me!!!!!!
*February 23, 2013*

**science**

what are three opposites or non-examples of fossil records?
*February 23, 2013*

**Math **

Math please help
*February 22, 2013*

**Helpppp **

It's college math
*February 22, 2013*

**Helpppp**

Find the apr to the nearest half percent for the following loan Amount financed $3400 Finance charge $470 Number of monthly payments 36 Please help
*February 22, 2013*

**Finance**

Find the finance charge in the open end charge account. Assume interest calculated is on the unpaid balance of the account Unpaid balance $611.80 Monthly interest rate 1.1%
*February 21, 2013*

**Calculus**

Differentiate with respect to theta Y=((sin3theta)(tan3theta))^12
*February 10, 2013*

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!
*January 27, 2013*

**please help!**

How do you believe computer mediated communications may affect the future of human communications? PLEASE HELPP !!!!
*January 27, 2013*

**please help!**

Thank You Very Much !! I kinda of got the idea now . Thanks soo much !
*January 27, 2013*

**please help!**

I checked it out and so far i wrote. but i need 200-400 words !! Please Help In my opinion, I believe it is unlikely for humans to avoid or completely stop attribution errors. One reason why is because humans are naturally made to assume things in which we do not know the ...
*January 27, 2013*

**please help!**

Oh Thanks , I Did not see it.
*January 27, 2013*

**please help!**

How do you believe humans can, best, avoid "attribution" errors?
*January 27, 2013*

**please help!**

How do you believe humans can best,avoid attribution errors ?
*January 27, 2013*

**Speech**

I don't know how to start and also I don't understand the topic I have to write about.
*January 27, 2013*

**Speech**

Post a one hundred word comment on how you believe computer mediated communications may affect the future of interpersonal communications . I DO NOT KNOW HOW TO DO THIS! PLEASE HELP
*January 27, 2013*

**Speech**

copy paste what?
*January 27, 2013*

**Speech**

How do I post a one hundred word paragraph on how I believe computer mediated communications may affect the future of interpersonal communications ?
*January 27, 2013*

**Math**

Sarah can make 6 bracelets per half hour. How many bracelets can she make in 1 hour? Find the factor for the conversion, pints to quarts .
*January 14, 2013*

**Writing**

How can I write a sentence with the word declare, and has to have 10 syllables?
*January 9, 2013*

**Algebra**

how?
*January 9, 2013*

**Algebra**

Write an equation in slope-intercept form of the line that passes through the given point and is parallel to the graph of the given equation. (4,2; x= -3
*January 9, 2013*

**Anyone Please Help!**

thanks
*January 2, 2013*

**Anyone Please Help! **

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane cruised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**Math (Ms. Sue Please help!)**

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane cruised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**math (algerba 1)**

I still don't understand.
*January 2, 2013*

**math (algerba 1)**

I have a worksheet called puzzle 21 Super Challenge. It's from Crossmatics, Dale Seymour Publications and it's page number is 21. Anyways, I don't understand what it means when it says see 4-across. What does that mean?
*January 2, 2013*

**math (algerba 1)**

A motorboat can travel upstream on a river at 18km/h and downstream at 30km/h. How far upsteam can the boat travel if it leaves at 8am and must return by noon?
*January 2, 2013*

**Math**

A plane on a search mission flew east from an airport, turned, and flew west back to the airport. The plane crised at 300km/h when flying east, and 400km/h when flying west. The plane was in the air for 7 hours. How far from the airport did the plane travel?
*January 2, 2013*

**math**

thanks. I though because you added 70t and 80t there would be 2ts. But no.
*January 2, 2013*

**math**

Never minds. I see my mistake. It's really 6 hours.
*January 2, 2013*

**math**

Two trucks left buck's trucks traveling in opposite directions. One truck traveled at a rate of 70km/h, the other at 80km/h. After how many hours were the trucks 900km apart? I got 3 hours as my answer, but I dont think that's right...
*January 2, 2013*