Monday

November 24, 2014

November 24, 2014

Total # Posts: 42

**Trigonometry**

I am having problems with proving identities that has a number and an exponent with it. Like: *2cosxcsc2x = cscx *sin^2 2x = 4sin^2 x cos^2 x *cot2(theta)=csc(theta)-2sin(theta)/2cos(theta)
*October 29, 2014*

**Trigonometry**

Oh ok! but I can't seem to understand the "sin 50 = h/7 h = 5.36" part. Is that a formula of getting the height?
*August 2, 2014*

**Trigonometry**

how did you get the angles in b.)?
*August 2, 2014*

**Trigonometry**

Wow that was fast! Thank you so much! :)
*August 2, 2014*

**Trigonometry**

Two observers who are 2 miles apart on a horizontal plane observe a balloon in a same vertical plane with themselves. the angles of elevation are 50 degrees and 65 degrees respectively. find the height of the balloon,(a)if it is between the observers;(b)if it is on the same ...
*August 2, 2014*

**math**

five friends plan a chess tournament. how many possible games can be played if each person plays with each other person exactly once.
*June 19, 2014*

**Math**

Solve for the inequality: 1/3^x (1/3^x - 2) < 15 I know the answer is x > - (log 5/log 3), can someone explain me how?
*May 10, 2014*

**Statistics**

75.3033 is the answer
*August 17, 2013*

**Physics**

A boy and his skateboard have a combined mass of 64 kg. If he is moving with a speed of 3.2 m/s, and collides with a stationary skateboarder whose mass (including his skateboard) is 96 kg, with what speed will the two skateboarders move immediately after the collision? assume ...
*August 14, 2013*

**math calculus (please help me)**

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
*May 18, 2013*

**Grade 12 Calculus **

Determine the absolute extrema of each function on the given interval. Illustrate your results by sketching the graph of each function. a) = − 4 + 3 , 0 ≤ ≤ 3 b) = − 1 , 0 ≤ &#...
*April 15, 2013*

**umuc**

Discuss qualitative and quantitative test you would perform to detect or quantify monosaccharides in solutio. Discuss the chemical basis of the tests.
*February 12, 2013*

**umuc**

Draw and name the different structural forms of L-fructose that would exist in aqueous solutions
*February 12, 2013*

**Biostatistic**

The following replicate calcium determinations on a blood sample using atomic absorption spectrophotometry (AAS) and a new colorimetric method were reported. Is there a significant difference in the precision of the two methods?
*December 20, 2012*

**Biostatistic**

An enzymatic method for determining alcohol in wine is evaluated by comparison with a gas-chromatography (GC) method. the same sample is analyzed several times by both methods with the following results (% ethanol). Enzymatic method: 13.1, 12.7, 12.6, 13.3, 13.3. GC method: 13...
*December 20, 2012*

**Chemistry**

Calculate the heat needed at 0 degrees Celsius in each of the following: joules to melt 65.0g of ice
*January 10, 2012*

**physics**

A parallel plate capacitor has square plates of side L= 12 cm and a distance d= 2 cm between the plates. Half of the capacitor areae is filled with a dielectric with k1 = 35. the other half is filled with a different dielectric with k2 = 8. The effective( equivalent ...
*November 22, 2011*

**physics**

A 2.0 nF parallel plate capacitor with a sheet of mylar (k= 3.1) filling the space between the plates is charged to a potential difference of 90 V and is them disconnected. How much work would be required to completely remove the sheet of mylar from the space between the two ...
*November 22, 2011*

**Math **

"Solving a system involving three unknowns." We're supposed to use substitution or elimination. 3d+e-2f=-14 2d-3e+4f=-23 5d+4e-10f=-13
*May 17, 2011*

**chemistry **

I understand what you're saying, but in my text book it says a buffer is a weak acid or base with its salt, so is that not always true?
*May 12, 2011*

**chemistry **

So then the common answer for any titration with a strong acid there is no buffering/buffer region?
*May 12, 2011*

**chemistry **

it doesn't right because for like HCl it doesn't really have a Ka?
*May 12, 2011*

**chemistry **

so in strong acid strong base titration does the pH=pkA?
*May 12, 2011*

**chemistry **

Do strong acid strong base titrations have a buffer region?
*May 12, 2011*

**ORGANIC CHEM I**

hOW MANY POSSIBLE STEREOISOMERS DOES MENTHOL HAVE ?
*April 11, 2011*

**ORGANIC CHEM I**

A PROCESS THAT INVOLVES SYMMETRICAL BOND BREAKING AND BOND MAKING IS A(AN) ?
*April 11, 2011*

**algebra**

Write the equation in y=mx+b form. Find the equation of the line that passes through the points (8,-15) and (-2,5) I am unable to get this answer!
*February 21, 2011*

**math**

2/x+3 = o solve for x. Is this where I go: 2= 0 x+3=0?
*February 21, 2011*

**math**

x-2y= -5 2x+y= -5
*February 20, 2011*

**algebra**

How long will it take a car traveling at 60 mph to overtake a bus traveling at 40 mph if the bus had a 1.5 hour head start?
*February 20, 2011*

**algebra**

A train can travel 280 miles in the same time that it takes a car to travel 140 miles. If the train's rate is 40 miles per hour faster than the cars, find the average for each.
*February 20, 2011*

**problem solving**

The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 21 minutes requires 12.6 gallons of water. Find the amount of water used for a shower lasting 10 minutes.
*February 20, 2011*

**Algebra**

There are 220 calories per 32 grams of cereal mix. Find how many calories are in 55 grams of the cereal mix.
*February 20, 2011*

**social studies **

what aspects of a fast food restaurant would interest sociologists
*February 18, 2011*

**Chemistry**

First you multiply 10.0 with 540cal/1 g of H2O. To calculate the amount of heat added to (or removed from) a sample of water, the mass of the sample is mulitipled by the heat of vaporization, which is 2260. As before, no temperature change occurs during a change of state. the ...
*January 19, 2011*

**math subject**

make (a) the subject 2a+squareroot of 2a^2=10
*September 28, 2010*

**math subject**

help
*September 28, 2010*

**math subject**

make (a) the subject 2a+ã2a^2=10 please and thank you (the 2a^2 is all spuare rooted)
*September 28, 2010*

**math**

5:05-1hr= 4:05 4:05-15mins =3:50 bcuz: 15mins can't be substracted from 5mins so u cross the hr 4 to 3 then add 5mins to 60mins to get 65mins, and then u minus 15mins to get 50mins so the answer will be 3:50 and not 3:55.
*May 5, 2010*

**accounting**

750,000
*September 27, 2009*

**French**

I want to ask is it Je suis etudiante or Je suis une etudiante?
*January 25, 2008*

**French**

Are my sentences correct? I am japanese and I am also canadian. Je suis japonaise et je suis canadienne aussi. I am a student at university. Je suis une etudiante a l'universite. I live in richmond, a city in Canada. J'habite a richmond, une ville au Canada. I like to ...
*January 25, 2008*

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