# Posts by marcus

Total # Posts: 264

**Chemistry**

Ethanol is a fuel that can be made from corn. How many kJ of heat energy are released when 3.00 kg of ethanol are burned? C2H5OH(l) + 3O2(g) ¨ 2CO2(g) + 3H2O(g) H = -1406.8 kJ/mol

**calculus**

Use an appropriate local linear approximation to estimate the value of Cotangent 46 degrees.

**computer science**

write a program that asks the user to enter today's sales rounded to the nearest $100 for each of three stores. the program should then display a bar graph comparing each store's sales. create each bar in the graph by displaying a row of astericks. each asterick should...

**grammar**

How do I know what the simple subject of the sentence is and the complete subject?

**social studies**

what effect did california's rapid population growth have on californios and native americans

**7th grade**

how did some people hope to solve the problem of california's isolation from the rest of the country

**College Physics**

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 6.4 s later. If the speed of sound is 340 m/s, how high is the cliff?

**science**

What type of object will the Sun leave behind once it finished dying? I know the answer is white dwarf, but what will its mass be like? big or small? What types of objects will high-mass stars leave behind once they finish dying? I want to say neutron stars, but what size, ...

**Math**

How would proportions be used to "scale up" or "scale down" something? (Not really sure if I even understand what this means. I even read my text and I can't figure this out.)

**economics**

if utility=a-b where a and b are 2 goods what does this tell you about the two goods?

**economics**

a new iphone is released which has 32gb memory as opposed to the old one which had 16gb. If the price of both models are the same what would happen to the market of the old model? What would happen if the new one was more expensive?

**math**

consider the set of Northwestern states or provinces (montana, washington, Idaho, Oregon, Alaska, British Columbia, Alberta) if a person choose one element, show that in three yes or no questions we can determine the element

**math**

61 99 160

**math**

71, 109, 180 is that right

**math**

List terms that complete a possible pattern in each of the following. 7,8,15,23,38 ____, ____, _____ I can not figure this out.

**Mathematics**

the way u did

**Mathematics**

I need to solve this problem in two diferent ways showing work. I have one way but I don't know what the other way could be the problem is 3 3/4 +5 1/3

**Math-factoring**

I need to know how to do this. In steps 9x^2-3x 4x^2-9

**math**

If the argment is correct supply the missing reasons. what is the reason? I don't know.

**math**

I don't know what to do. Hosni fave the following argument that -(a+b)= -a+-b, for all intergers a and b. If the arqument is correct, suppy the missing reasons. If it is in correct explain why not. -(a+b)=(-1)(a+b) =(-1)a+(-1)b =-a+-b

**math**

2^100+2^100 is the answer 4^200

**math**

Wally kept track of last week’s money transactions. His salary was $150 plus $54 in overtime and $260 in tips. His transportation expenses were $22, his food expenses were $60, his laundry costs were $15, his entertainment expenditures were $58, and his rent was $185. ...

**math problem**

thank you

**math problem**

2nd 8000 1st 4000

**math problem**

2nd 16,000 1st 8,000

**math problem**

2nd $1600 1st $800

**math problem**

In a television game show, there are five questions to answer. Each questin is worth twie as much as the previous question. If the last question was worth $64000, what was the first question worth?

**Math 156**

In which situations is it appropriate to display data using circle graphs? When is it inappropriate to use the data displays in circle graphs?

**latin**

Odii servitutem? would that translate to hatred of slavery?

**chemistry**

the specific heat capacity of mercury is 0.033 cal/(g))degrees Celsius)How many grams of Hg could be raised to 50 degrees celsius from 27 degrees celsius with 381 joules?

**geometry**

in parallelogram abcd, diagonals ac and bd intersect at e. AE=3x-4, and EC=x+12. what is the value of x? i believe that x=8. i set them as equal and i minus x from 3x and 4 from 12. is this right?

**math**

if i wanted to solve for r: s=(a/1-r)

**math.....need help**

Solve the problem. An open box is to be made from a rectangular piece of tin by cutting two inch squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin.

**math**

Solve the problem. Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t2. How many seconds will it take for the rock to hit the ground (h=0)?

**5th grade**

need answers complete 7 km 8 m = 6 km __m 2. 3mi 27 ft = 2 mi __ ft

**Calc**

evaluate the indefinite integral: x^13(cos(x^7))dx I've tried using integration by parts but I haven't ssem to be getting the right answer. I've used u=x^13 and dv=cos(x^7) and vice versa... much help is appreciated

**History/admendment 5**

Mr.Daly is running short on cash and needs to gas up his car. After filling his car up at the local gas station he takes off without paying. He is put on trial and somehow (miraculously for Mr. Daly) he is found innocent. The prosecution finds new evidence that will surely ...

**calculus**

find dy/dx of xsiny+cos2y=cosy

**chemistry**

whats the answer

**english**

will folded up their map and slid it into his pocket between them they carried torches string a penknife

**8th grade science**

what is an example of suspension

**7th grade science**

what is an example of a solid solution>?????

**science**

why do particles of a solution not seporate?

**science**

what is one example of a solution?

**chemistry**

acid

**math**

complete the table that shows the length of the chain formed when rings are liked in a staright line 1)number of rings 1 length of chain 16mm 2)number of rings 2 length of chain 30m 3)number of rings 3 length of chain 44m 4)number of rings 6 length of chain ( ) 5)number of ...

**chemistry**

Please calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP. This very question has been bugging me all weekend. Can some one please solve this quesiton it would really be appreciated.

**chemistry**

Calculate the solubility of zinc hydroxide at 25 °C. The Ksp of Zn(OH)2(s) is 4.5 x 10^-17 at 25 °C? What did I do wrong? Zn(OH)2 <----> Zn2+ + 2 OH- let x = moles/L of Zn(OH)2 that dissolve. This gives us x moles/L of Zn2+ and 2x moles / L of OH- [Zn2+] = x [OH...

**Algebra**

ã[81x12y8z10]

**Planets**

Thank you very much. This helps a lot. Marcus, age 10

**Planets**

Why is Venus hotter than Mercury even though Mercury is closest to the Sun?

**Science**

How would day and night be different if Earth's axis were not tilted?

**Math: Geometry**

The circumference of the base of a cylinder is 16 cm. The height of the cylinder is 10cm. a. What is the surface area of the cylinder? b. What is the volume of the cylinder? Need help on this one. I have the formula but I'm a little confused because I don't know what ...

**Kaplan University**

The Linear equation y=6x-5 graphs as a horizontal/vertical/diagonal line ( choose the correct label and type it below)

**math**

What is the relationship between shapes and shapes?

**Math**

What is the relationship between shapes and other shapes

**media analysis**

Just some sources of info, maybe ideas, i have to do an in-class essay and im having a bit of trouble locating information

**media analysis**

Who is a jounalist responsible to, they're employer or the viewing public? I also need particular examples of when news has been withheld for the good of the public or vice-versa for profit/ratings. if you can help then thanks :-)

**7th grade math**

Thank you DrBob222 I am having lots of problems with this homework

**7th grade math**

place the operation signs (+,-,x, divide) in the order that makes each sentence true 18__6__2=15

**science**

A brain can be related to a cell.

**social studies**

I need names of twenty famous people in world history, who are not americans. Here is web site that will not get 20 but will get close. The disadvantage is that all of them are from or lived in a small town AND it was years ago. You may want newer faces. You can add the names ...

**4th Grade math**

Solve. I have no digits the same. My thousands digit is less than my tens digit. My hundreds digit is twice my ones digit. If you add my digits, the sum would be 25. Who could I be? Could I be 2 numbers? We can not figure this out. Can someone help please. Let's find out ...

**spanish**

mis padres y yo ____ de carldo. whats the correct verb