# Posts by DC

Total # Posts: 45

**Maths**

The projection of a line on axes are 6,2,3. What will the direction cosines of the lines be?

*October 21, 2016*

**Maths**

Here, P=Q-1 Now, P-Q = Q-1 - Q = -1 Therefore, P-Q=-1

*October 21, 2016*

**Math**

Multiply. write each product in simplest form. 3 7/10 X 7

*October 9, 2016*

**math common core**

1/4 pages typed per minute how many pages can be typed in 18minutes

*September 27, 2016*

**Biology**

ribosome structure

*February 19, 2016*

**math**

carmen is a girl scout camp counselor and needs to assign scouts to tents. She noticed that if two scouts were assigned to each tent then six girls would have no tent. On the other hand, if four scouts were assigned to each tent then there will be three empty tents how many ...

*December 3, 2015*

**math**

In a grand prix automobile race, Speedy Ryder averaged 110 miles per hour for the first half of the course and 130 miles per hour for the second half of the course. Cannonball Carter maintained a constant speed of 120 miles per hour throughout the race. Who won the race?

*December 3, 2015*

**math**

Tasha’s school bus usually drops her off in town every day at 4pm and her mother picks her up at the bus stop. Last Friday was a short school day, only Tasha’s mother forgot so she wasn’t at the bus stop when Tasha was dropped off an hour early, at 3pm. Since ...

*November 10, 2015*

**math**

two cars are approaching each other on the same highway one from san bernardino at 80 mph and the other from las vegas at 60 mph how far apart are they on the highway one hour before they meet?

*November 10, 2015*

**math**

The entire second grade at Sunshine Elementary participated in a single elimination checkers tournament. There are a total of 118 second graders and so there were 59 matches in the first round of the tournament. In the second round,the 59 remaining students were paired, ...

*October 30, 2015*

**Math**

azmin decided to get some exercise by taking the stairs from the first to the fifth floor in her apartment building. The first time she went up the entire flight, she walked up some steps and ran up 16 steps. This took a total of 60 seconds. The second time she went up the ...

*October 29, 2015*

**geometry**

If Dave is 6 feet tall and casts a shadow of 15 feet, what is the height of a tree that casts a shadow of 81 feet? Draw a diagram and solve for the height of the tree.

*May 21, 2014*

**physics**

A 34-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 220 J from 480 J. How high does she rise during this interval? Neglect air resistance.

*November 4, 2013*

**Chemistry**

ok I recalculated and got the w=.006523kJ and the energy change to be -76.82kJ... The energy change is right but the w is wrong for some reason... I calculated w as w=-delta(n)RT = -(0-.26312molO2)(8.314452x10^-2 Lbarr/molK)(25+273.15) = 6.5226J=.006523kJ...

*November 3, 2013*

**Chemistry**

help - confusion :( The oxidation of copper(I) oxide, Cu2O(s), to copper(II) oxide, CuO(s), is an exothermic process, 2 Cu2O + O2 --> 4CuO The change in enthalpy upon reaction of 75.30 g of Cu2O(s) is -76.83 kJ. Calculate the work, w, and energy change, ΔUrxn, when 75....

*November 3, 2013*

**Chemistry**

I would really appreciate some help with this thermochemistry problem! I'm really confused as to why I keep getting the wrong answers... I have gotten w=-1.305kj and energy change = 78.13kj... both of which were marked wrong. Here's the question: The oxidation of ...

*November 3, 2013*

**Chemistry**

Thanks Dr.Bob!! I was then able to plug into the second equation and found the concentration of calcium! You were great help! Thanks again :)

*November 2, 2013*

**Chemistry**

These are the given Ksp values to use: Ksp of Co(OH)2 is 5.9x10^-15 M^3 Ksp of Ca(OH)2 is 5.0x10^-6 M^3

*November 2, 2013*

**Chemistry**

A mineral sample is analyzed for its cobalt and calcium content. A sample is dissolved, and then the cobalt and calcium are precipitated as Co(OH)2(s) and Ca(OH)2(s). At what pH can Co(OH)2(s) be separated from Ca(OH)2(s) at 25 °C? Assume that an effective separation ...

*November 2, 2013*

**Chemistry**

A canister holds a gas at 16.3 psi when the temperature is 15˚C. To what will the pressure change when the temperature is increased to 20˚C? *

*April 17, 2013*

**Chemistry**

A canister holds a gas at 16.3 psi when the temperature is 15˚C. To what will the pressure change when the temperature is increased to 20˚C? *

*April 17, 2013*

**Chemistry**

10.7 L of a gas at 1.75 atm are expanded to 20.0 L at a constant temperature. What is the new gas pressure? *

*April 17, 2013*

**Physics**

,,,,,,

*February 13, 2013*

**Math**

Thank you Ms. Sue - Happy Holidays to you!

*December 21, 2012*

**Math**

(ACB)24

*December 21, 2012*

**Math**

Twelve people serve on a board and are considering three alternatives: A, B, and C. The choices followed by vote is shown in following table. Determine the winner, if any, using a Borda count. (ABC) 2 (ACB) 4 (BAC) 2 (BCA) 1 (CAB) 2 (CBA) 1 The winner is _____?

*December 21, 2012*

**Algebra**

You're awesome, thank you much and Happy Holidays to you!

*December 21, 2012*

**Algebra**

A club consists of 16 men and 19 women. In how many ways can they choose a president, vice president, treasurer, and secretary, along with an advisory committee of six people? (Round the answer to five decimal places.) _____ x 10(to the 11th power) ways

*December 21, 2012*

**Algebra**

You're awesome, thank you much and Happy Holidays to you!

*December 21, 2012*

**Algebra**

The campus vets club is having a raffle and is selling 2,700 tickets. If the people on your floor of the dorm bought 297 of those tickets, what is the probability that someone on your floor will hold the winning ticket? (Enter your answer as a decimal.)

*December 21, 2012*

**Algebra**

Thank you so much for your response. Just to be clear are you saying I need to multiply .8176 x 80 and then .7977 x 80?

*December 21, 2012*

**Algebra**

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 175 and a standard deviation of 6. We find the heights of 80 people. (a) How many would you expect to be between 167 and 183 cm tall? (b) How many would you expect to be taller than 170...

*December 21, 2012*

**physics**

if i travel in a bus which have 40km/hour speed than i through a coin in vertical hight. Does the coin fall in my hand

*June 28, 2012*

**living life a health life**

what are the three methods by which HIV and AIDS are usually transmitted?

*June 27, 2012*

**Math**

x>55

*February 9, 2012*

**Math**

5w=42

*January 29, 2012*

**college**

Evaluate the difference quotient for the given function. Simplify your answer. f(x) = 3 + 5x − x2, f(4 + h) − f(4) h

*September 11, 2011*

**LIfe orientation**

5 ways : Water and sanition , Population

*April 26, 2011*

**math**

(9x^4+0x^3+8x^2+17x-20)÷(-3x-4)

*February 24, 2011*

**math**

The sum of the page numbers on the facing pages of a book is 457. Find the page numbers?

*November 15, 2010*

**business**

Consider the wide spectrum of business organizations, ranging from gigantic corporations to working at home. Describe at least three types of business organizations that you are familiar with or that you would like to know more about. How is each one advantageous to the ...

*May 4, 2010*

**chem**

method of producing aspirin

*March 13, 2008*

**ss**

what type of fallacy 12. That's gotta be a great line of clothes. Have you seen the prices and the people endorsing it? 8. Michael Jordan wore that brand, so those must to be the best basketball shoes. (FALSE ANALOGY) 5. All right-thinking people will support the Board of ...

*January 20, 2008*

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