Thursday

May 28, 2015

May 28, 2015

Total # Posts: 1,751

**Human and Social Biology**

Describe how social biologist may help to solve the the problems of lack of houses a nd problem ooof sanitation
*October 8, 2013*

**Chemistry**

How many years will it take for 88g tritium to decay to an 11g sample?
*October 6, 2013*

**Physics**

A rocket of 500 kg accelerates away from earth with an engine thrust of 13,500 N. a) what is the weight of the rocket? 4900 N b) how fast did the rocket accelerate? (I know the answer is 17.2 m/s^2 but how did they get that?)
*October 5, 2013*

**Math **

When they dial 3 and turn the oven on, it is like pushing the old button 3 times. That means if they start with one pizza in the oven, dial 3, and turn the oven on, they will get 27 pizzas. (33 = 27) Then if they dial -3 and turn the oven on it is like flicking the old switch ...
*September 30, 2013*

**Math**

Chen’s father was 25 when Chen was born. In 5 years Chen will be exactly half his father’s age. a. Try to figure out how old Chen is now. Describe how you got your answer. b. Now solve the problem using equations.
*September 30, 2013*

**Algebra**

The Big Screamer Coaster carries 92 people altogether. Some of its cars carry 4 passengers, and the rest carry 6 passengers. There are three less 6-passenger cars than 4-passenger cars. How many 4-passenger cars are there? Please help!
*September 26, 2013*

**physics**

A car exciting the highway moving at 27 m/s slows down at the rate of 3.5 m/s^2 to a final velocity of 18 m/s. Calculate the distance the car travels while braking?
*September 26, 2013*

**Math**

Steve has the correct solution, but the method used in the Common Core lesson involves proportions. The current ratio of maple to oak trees is 3:11 and there are now 132 oak trees. 3 maple trees X maple trees ------------- = --------------- 11 oak trees 132 oak trees using ...
*September 19, 2013*

**Finance**

Chip’s Home Brew Whiskey management forecasts that if the firm sells each bottle of Snake-Bite for $20, then the demand for the product will be 15,000 bottles per year, whereas sales will be 91 percent as high if the price is raised 18 percent. Chip’s variable cost ...
*September 13, 2013*

**Chemistry**

Calculate the volume of 5.6 kg of ethanol that has the density 0.785 g/cm3
*September 10, 2013*

**human physiology**

Please help, with the following question: "When an enzyme reaches its saturation point,..." A) the amount of substrate for the enzyme to act upon is very high B) the amount of substrate for the enzyme to act upon is very low C) the amount of product produced ...
*August 27, 2013*

**algebra**

A customer is buying a $100 drill and two $15 drill bit sets. The customer uses a gift card worth $50 to pay for a portion of their bill. How much cash will the customer pay (before taxes)?
*August 20, 2013*

**Trig hep, please? Thank you!**

I will try the others soon.
*August 17, 2013*

**Trig hep, please? Thank you!**

thanks! what do the question marks stand for. and also CAST?
*August 17, 2013*

**Trig hep, please? Thank you!**

1. Find the exact value of sin(195(degrees)) 2. If cot2(delta)=5/12 with 0(<or =)2(delta)pi, find cos(delta), sin(delta) , tan(delta). 3.find the exact value of sin2(x) if cos(x)= 4/5. (X is in quadrant 1) 4. Find the exact value of tan2(x) if sin(x)=5/13. ((X) in quadrant ...
*August 17, 2013*

**Finite math**

$5.491921.88
*July 28, 2013*

**Science**

A thin plastic blanket, with a shiny metallic surface, is wrapped a walker who has collapsed after a steep climb. Which type of heat loss is the shiny surface intended to reduce?
*July 20, 2013*

**Chemistry**

Which statement about resonance structures is TRUE: 1) There can never be more than two resonance structures for any molecule. 2) Only ionic compounds use resonance structures 3) The real structure of a molecule is an average or hybrid of the resonance structures 4) Resonance ...
*July 19, 2013*

**finance**

Tangshan Mining is considering issuing long-term debt. The debt would have a 30 year maturity and a 12 percent coupon rate and make semiannual coupon payments. In order to sell the issue, the bonds must be underpriced at a discount of 2.5 percent of face value. In addition, ...
*July 15, 2013*

**leadership**

Prior to the industrial revolution the study of leadership relied on a scientific studies b. intuition and description c. case analyses d. the trait approach to understand leaders
*July 13, 2013*

**chemistry**

In my experiments I mixed different ratios of CuSO4 and NaS. The ratio in which I had the greatest amount of precipitate was when I mixed 3mL CuSO4 : 3mL NaS. Now my question: What is indicated by the maximum amount of precipitate...? Thanks in advance.
*July 10, 2013*

**Com200**

One reason language is so powerful is that it is the means by which you construct your reality. T or F I believe the answer is true.
*July 10, 2013*

**Chemistry**

Calculate the ph of a buffer made from 0.25 m NH4Cl and 0.42 M NH3. Kb= 1.8 x 10^-5
*July 10, 2013*

**science**

give the value of acceleration due to gravity
*July 9, 2013*

**chemistry**

What are the spectator ions in the following complete ionic equation: Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq). Thank you so much!!!
*July 8, 2013*

**chemistry**

Ba2+(aq)+2I−(aq)+2Na+(aq)+SO2−4(aq)→BaSO4(s)+2I−(aq)+2Na+(aq)
*July 8, 2013*

**math**

how do you factor this: 5p + 15q
*June 28, 2013*

**Math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 7x^3 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**Math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 4 − 6x + 7x2 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 2x/x-7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = x/x+6 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**MAth**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 2/x+5 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**Math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 17 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**math**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = x^2+7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**mah**

Find f(a), f(a + h), and the difference quotient f(a + h) − f(a) ------------------ h , where h ≠ 0. f(x) = 6x + 7 f(a)= f(a + h) = f(a + h) − f(a) ----------------- = h
*June 13, 2013*

**Physics**

If an object on Pluto has a mass of 10 kg and a weight of 6.6 N, what is the acceleration due to gravity at its location?
*June 11, 2013*

**Algebra**

The work and solution to: Stefan is bicycling on a bike trail at an average of 10 miles per hour. Erik starts bicycling on the same trail 30 minutes later at 16 miles per hour. How long will it take Erik to pass Stefan?
*May 29, 2013*

**language (sentence fluency)**

D, read them aloud to make it easier
*May 28, 2013*

**Math**

(1/2)2+1/2* 2 4/5
*May 28, 2013*

**physics**

A 156-kg coil of sheet steel is 0.80 mm thick and 50 cm wide. How long is the steel in the coil?
*May 26, 2013*

**world geography**

commercial areas
*May 19, 2013*

**Algebra 2**

I need help trying to solve trigonometric identity problems I just need help if someone could break it down step by step how to solve for: if cos of theta is -3/5 find csc of theta
*May 9, 2013*

**CHEM**

How many liters of O2 will react with 100 liters of H2 according to the gas phase reaction: O2 + 2H2 ------2H2O
*May 3, 2013*

**Algebra 2**

2. The lengths of boats in a harbor, in feet, are listed below. 17, 16, 56, 50, 14, 30 12, 33, 82, 16, 10, 52 25, 25, 19, 75, 24, 12 30, 12, 20, 38, 26, 36 33, 24, 18, 26, 40, 40 a. Make a frequency table for the data set. Use 5–14 as the first class interval. b. Use the ...
*May 3, 2013*

**pre calculus**

use the rational zeros theorem to find all the real zeros of the polynomial function. use the zeros to factor f over the real numbers: f(x)=x^4+2x^3-7x^2-8x+12 I am totally lost, please help?
*April 29, 2013*

**Chemistry**

The second one you had described turned out to be the answer.
*April 21, 2013*

**Chemistry**

Write an equation that represents how dihydrogen phosphate ion (H2PO4-) behaves as an Arrhenius acid. ( Be sure to include the correct charges for ions.)
*April 21, 2013*

**Chemistry**

Write an equation showing that calcium hydroxide acts as an Arrhenius base in water. **(I'm not sure where to start or how to go about this question)
*April 21, 2013*

**Chemistry**

I have come up with a product of HCl_2O^+ + )H^- But that wasn't correct neither was HClO^+ + OH^-
*April 21, 2013*

**Chemistry**

Write the product for the reaction when dichlorine oxide (Cl_2O) reacts with water (the product will have only one equivalent of chlorine in it).
*April 21, 2013*

**Chemistry**

A 19.9mL volume of a hydrochloric acid solution reacts completely with a solid sample of magnesium carbonate, producing 183mL of CO2 that is collected over water at 24.0 degrees C and 738 torr total pressure. The vapor pressure for water at 24.0 degrees C is 22.39 mmHg. What ...
*April 18, 2013*

**english**

Select the gerund phrase in the sentence below. Then, determine the noun function of the gerund. Writing a research paper sounds difficult.
*April 18, 2013*

**social studies**

john cabot laid claim to the newfoundland region of canada for______ in 1497.
*April 7, 2013*

**Earth science**

Waste produced by people along the East Coast of the United States has been dumped into the Atlantic Ocean where it is distributed by surface ocean currents. Which coastal area is most likely to become polluted by this waste?
*April 2, 2013*

**Statistics**

Two cards are drawn from an ordinary deck of cards, and the first is not replaced before the second is drawn. What is the probability that one card is an ace and the other is a king
*April 2, 2013*

**Biology**

I'm doing a lab for gel electrophoresis and we added the digests in the wells of the agarose gel Lane 2 – λ Hind III (a standard) Lane 4 – Tube 1 Lane 5 – Tube 2 Lane 6 – Tube 3 Lane 7 – Tube 4 Now will DNA in tube 1 which only has dh20, 10x ...
*April 2, 2013*

**pre calculus**

steve....that site isn't working for me! Nicole....what do I do once I evaluate 1/121x?
*April 2, 2013*

**pre calculus**

2. Graph the following function using transformations. Be sure to graph all of the stages on one graph. State the domain and range. y= -2 lxl +2 For example, if you were asked to graph y= x^2 + 1 using transformations, you would show the graph of y= x^2 and the graph shifted ...
*April 2, 2013*

**Chemistry**

which molar mass do you use? pb(OH)2 or pb2+?
*April 1, 2013*

**Physics**

Question 2. 3 Consider a box that explodes into two pieces while moving with Fig. 9-24 a constant positive velocity along an x axis. If one piece, with mass : m1, ends up with positive velocity v1, then the second piece, with : mass m2, could end up with (a) a positive ...
*April 1, 2013*

**Science Physics**

So weight is mass times gravity On earth, w(12N) = m*10m/s2. Solve for mass. Mass= 1.2N Use that to find mars' gravity. 4.8= (1.2)*g Solve for g. G= 4m/s2
*April 1, 2013*

**Math**

1mile * $2.25= $2.25 Remaining miles are 4.2 which is 42 tenths of miles. 42*.15= $6.30 Total for ride is 6.30 + 2.25= $8.55 He paid $10, so 10-8.55=$ 1.45 which is the change or can be called the tip. 2trillion = 2,000,000,000,000 750 billion= 750,000,000,000 Subtract 2,000,...
*April 1, 2013*

**Math: Finding m<A**

ABC~DEF m<B = 25', m<D = 45', m<E = 25' How do find m<A?
*March 29, 2013*

**Geoometry Help: Find EF**

Thank you so much. Saved me from a big mistake :)
*March 29, 2013*

**Geoometry Help: Find EF**

ABC~DEF AB = 36, BC = 24, DE = 48 m<B = 110', m<E = 110' EF = ? I think it's 68. Yes? Or is something else?
*March 29, 2013*

**chemistry**

What will be the fastest reaction if a strong base, such as sodamide, reacts with a secondary alcohol, such as (2S)-butanol? a) deprotonation of the alcohol b) substitution with racemization of stereochemistry c) elimination to form the more substituted alkene d) substitution ...
*March 29, 2013*

**achieving academic execellence**

Becoming a discerning consumer of research is something you can achieve be practicing good research skills and using your A. critical thinking B. education C. resources D. college library
*March 26, 2013*

**chemistry**

provide the appropriate IUPAC name for the following alcohol. designate e or z 8 carbon chain double bonds between 4 and 5 and 6 and 7 methyl group on 6 OH on the second carbon [the only hint i got from this homework is to begin my answer with octadien-2-ol. can someone help ...
*March 25, 2013*

**chemistry quick question**

i just realized after entering my question my structure did not stay the way I wanted it to. the CH2 and OH are supposed to be over the 4th carbon in the chain and the CH3 is supposed to be under the 3rd.
*March 25, 2013*

**chemistry quick question**

I need help with something and can't find this anywhere online. my structure looks like this OH CH2 CH3CH2CH2CHCHCH2CH3 CH3 So that OH looks like it is on a ethyl group. I need to write the IUPAC name and I wrote 3-methyl-4-heptanol but realized my mistake as that would ...
*March 25, 2013*

**organic chemistry**

thank you for helping me, but since this question totally confuses me how did you get to this answer?
*March 21, 2013*

**organic chemistry**

can anyone help me please?
*March 21, 2013*

**organic chemistry**

which of the following represents the best strategy for synthesizing 2-butanol, CH3CH2CH(OH)CH3 a) CH3CH=CHCH3 + [H30]+ b) CH3CH2C (triple bond) CH + [H3O]+ c) CH3CH=CH2+ [CH3OH2]+ d) CH3C (triple bond)CCH3 + [H3O]+
*March 21, 2013*

**Speed'Distance'Time**

Determine the time taken when, distance is 7150 km and speed is 780 km/hr.
*March 19, 2013*

**Speed'Distance'Time**

Find out the distance covered when, speed is 960 km/hour and time is 1 hour 50 minutes.
*March 19, 2013*

**math**

My ass
*March 17, 2013*

**Physics**

A 500 kg elevator starts from rest. It moves upward for 4.00 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this power compare with the motor power when the ...
*March 16, 2013*

**Physics**

Sewage at a certain pumping station is raised vertically by 5.57 m at the rate of 1 860 000 liters each day. The sewage, of density 1 050 kg/m3, enters and leaves the pump at atmospheric pressure and through pipes of equal diameter. (a) Find the output mechanical power of the ...
*March 16, 2013*

**math**

Earth's mass, in kilograms, is 5.97x10^24. the moon's mass is 7.34x10^22. How many times greater is Earth's mass (in scientific notation)?
*March 14, 2013*

**Math **

A backpacking team is hiking At an average speed of 2 1/2 miles per hour. At that rate, how long will it take for a hike of 8 3/4 mi?
*March 8, 2013*

**Math**

55 1/2
*March 8, 2013*

**Math**

Karina earned $60 from her part time job. She spent 3/10 of it on food and 1/4 of it on music. How much money does she have left?
*March 8, 2013*

**Math**

A DVD case is 9/16 in. Thick. How many of these cases will fit on a shelf that is 1 1/2 ft wide
*March 8, 2013*

**Math**

A DVD case is 9/16 in. Thick. How many of these cases will fit on a shelf that is 1 1/2 ft wide?
*March 8, 2013*

**Math**

A new section of freeway will be 8 1/2 mi long. During the first month of construction, 2 7/10 mi were built. During the second month, 3 3/5 mi were built. How many more miles were left to build?
*March 8, 2013*

**Math**

2 1/5
*March 8, 2013*

**Math**

6 2/5
*March 8, 2013*

**Math**

Mr.Quakers science class has a 16 gallon aquarium that is 3/5 full. How much water is needed to fill it?
*March 8, 2013*

**Business Statistics**

1. Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 9.4%, and the standard deviation of the annual return was 17.5%. Suppose also that during the same 62-year time span, the mean of the annual return for long-term government bonds ...
*March 6, 2013*

**Chemistry**

Ammonia is used as a fertilizer throughout the world. It is often produced by reacting nitrogen gas with hydrogen gas in a synthesis reaction. How much ammonia in grams can be produced from 9207 grams of nitrogen and 44 000 L of hydrogen?
*March 4, 2013*

**Chemistry**

Answer had to be expressed as just as an isotope so it is **108/48Cd DrBob222 Can you explain how you got the 48 though? Where did the other proton come in when you just added to the mass?
*March 1, 2013*

**Chemistry**

I was thinking of something like this? (I'm not sure how to approach this problem): 108/47Ag ---> 107/47Ag + 1/0n then, 108/46Pd ---> 108/47Ag + 0/-1e
*March 1, 2013*

**Chemistry**

When silver-107 is bombarded with a neutron, a different isotope of silver forms and then undergoes beta decay. What is the final product? (My Hints: Write two separate nuclear equations.)
*March 1, 2013*

**Chemistry**

**241/95Am ----> 237/93Np + 4/2He Is the correct answer indeed. I was confused about the part where it was just talking about subatomic particles and thought I wasn't adding an element to balance the equation but neutrons. Thank you!
*March 1, 2013*

**Chemistry**

There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237.What subatomic particle is emitted from that decay process? Write a ...
*March 1, 2013*

**Chemistry**

75.7 days
*March 1, 2013*

**Chemistry**

Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of Radium-223 to decrease to 1.00% of its initial value?
*March 1, 2013*

**Pre-Calculus**

The stopping distance D of a car after the brakes have been applied varies directly as the square of the speed s. A certain car traveling at 70 mi/h can stop in 343 ft. What is the maximum speed it can be traveling if it needs to stop in 160 ft?
*February 26, 2013*

**college physics**

You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 0.75 A of current through the light bulb and 7.5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 5.625 W. Assuming any resistors that you need, ...
*February 26, 2013*