Friday

November 21, 2014

November 21, 2014

Total # Posts: 153

**Organic Chemistry**

The solubility of compound A in ethanol is 0.5 g per 100 mL at 0oC and 5.0 g per 100 mL at 78oC. (a) To make a hot, saturated solution of 15.0 g of A at 78oC, how much ethanol is required? (b) When the solution prepared in is cooled to 0oC, how much of compound A will be ...
*September 24, 2014*

**math**

Compute the monthly payments for an add-on interest loan of $850, with an annual interest rate of 15 percent and a term of 4 years.
*May 2, 2014*

**physics**

(a) Set up two equations. One for forces, one for torques. For the first equation, which way does friction act? i.e. which way would the yoyo move if there was slip? Since there is no slip, friction must be acting *against* the intended direction of motion. For the second ...
*December 6, 2013*

**Physics**

390 is for a deccelaration of 4 and not of 7.the right answer is 195
*November 2, 2013*

**PHYSICS(HELP)**

R=(G*mp*T^2/(4*pi^2))^(1/3) Vesc=sqrt(2*mp*G/R)
*October 17, 2013*

**American History**

or maybe japanese, since thats in one of the answers
*May 7, 2013*

**American History**

well i've only got what my paper gives me. but i'd assume it is talking about chinese, considering those were the main asian immigrants at the time
*May 7, 2013*

**American History**

Most of the asians who immigrated to the united states in the 1850s came because a.) Of available work b.) Of the rumor of a "golden mountain" in california" c.) they were forceds to flee due to collapes of the japanese economy d.) none of these
*May 7, 2013*

**Prob and stats**

A card is to be chosen at random from a shuffled deck. Find the probability the card drawn is A. The queen of clubs , given that it is an honor card B. a red four, given that the face number is even C. A seven, given that the face number is prime Please help me, thanks :)
*February 19, 2013*

**Physics**

Thanks. Also noted that V2 would only be 275 as once the pressure in the bottle reaches 1atm, the volume inside would be 25litres. So only 275litres are available.
*January 3, 2013*

**Physics**

25 litre bottle of oxygen in a hospital. If the bottle is at 12 atmospheres, what volume of oxygen is available to the patient? If the oxygen is stored at 4 degrees C and used at 20 degrees, what difference does this make? (Assuming start volume and pressure are still 25 ...
*January 3, 2013*

**earth science**

The wavelengths are shorter in this region
*January 1, 2013*

**math**

Venn diagram problem P only=33-18-x B only =26-17-x C only =25-19-x 15-x+9-x+6-x+8+10+9+x=63 -2x=63 X=-3 Which means you have to work with 3 in the middle
*December 24, 2012*

**calculus**

Group two by two X^2(x-3)+16(x-3) (X-3)(x^2+16) For zeros X-3=0 X=3 X^2+16=0 X^2=-16 X=+or- 4i
*December 24, 2012*

**calculus**

Just pick a number in the region Plug back into the function Neg ans means less than 0 Pos ans means greater than 0
*December 24, 2012*

**calculus**

Get you started you have to start by guessing X=3 works Then do long division Answer will be x^2+12x+36 Factor (X+6)(x+6) 3and -6 are your critical values Now you have to test the different regions
*December 24, 2012*

**Urgent Math**

Point of inflection I agree with you
*December 23, 2012*

**Math**

A) log 6a / log 6a B)5(log 9b/ log 9b) B should help you with C
*December 23, 2012*

**Math**

Permutation You have 210 objects taken 1 at a time
*December 23, 2012*

**Math**

Venn diagram problem I phone only. 70 Cars only. 10 Both. 60 Neither 60 Total 200 Hope this will help you
*December 23, 2012*

**maths --plse help me..**

Tan30= h/p Tan45=h/q p + q= 100 Use substitution (h/tan30) + (h/ tan45 )= 100 You should be able to take over
*December 17, 2012*

**World Geography and History**

The ideas of _____ _____ are the basis for communism.
*December 17, 2012*

**Math**

A) .98(210) and .98(240) B) (210)(240) (.98)(210)(.98)(240) Percent decrease = diff in your two answer/ original (210)(240)
*December 16, 2012*

**Mathematics**

Use your rules of logs Log a^(1/3) - log b^3 Log (a^(1/3)) / (b^3)
*December 16, 2012*

**Algebra 2**

U-shape turned downward and moved to the left 2 units Inside the() moves left or right opposite the sign Outside the () moves up or down same as the sign The negative flips the curve
*December 16, 2012*

**math**

Venn diagram 256-78-116
*December 16, 2012*

**calculus**

A). (7x+ 4)/(7x-8) Domain is all except x can not equal 8/7 because it will make the denominator equal to 0 B). ( 5x + 4)/ 2x Domain all except x can not equal 0
*December 15, 2012*

**calculus**

Rate of change is 2 because you have a line the rate of change (slope) is constant
*December 15, 2012*

**Math**

5000(1+ .055/2)^(2)(5)
*December 15, 2012*

**Geometry**

That is what I get
*December 14, 2012*

**Geometry**

Mid segment=1/2 the sum of the bases LM=(1/2)(46+125)
*December 14, 2012*

**7th grade math Ms. Sue please**

1 correct 2 correct 3 correct 4 correct
*December 14, 2012*

**Geometry...HELP**

6x+16=49 6x=49-16=33 X=33/6=5.5
*December 14, 2012*

**Geometry...HELP**

In a rectangle diagonals are equal Set the two equal to each other and solve
*December 14, 2012*

**Math**

You first have to find your rate .75 = e^ (r)(10) Then find the time for half- life .5 = e^ (r from above)(t)
*December 14, 2012*

**math**

X=width X+4= length X(x+4)=60 You will be factoring
*December 14, 2012*

**maths --plse help me..**

Khan , I think your units are off 40.6666 .... Hours The rate is km per hour 1586 km / ( 39 km/1hour) = 1586 km x (1 hour/ 39 km) Km drops and your left with hours Not sure where the days come in except 40 hours is short of 2 days
*December 14, 2012*

**maths --plse help me..**

Distance is equal to rate times time Therefore time is equal to distance divided by rate. 1586/39= 40 2/3 hours That means it takes 40 2/3 hours to go 1586 km when you are going 39 km per hour So if you start at 10:30 and go for 40 and 2/3 hours, which is 40 hours and 40 mins ...
*December 14, 2012*

**Algebra**

-7(3)^(6-1) Or -7, -7(3), -7(3)(3), -7(3)(3)(3), -7(3)(3)(3)(3), -7(3)(3)(3)(3)(3)
*December 12, 2012*

**calculus**

This graph is a v shape with vertex at (0,0) with a ray in the first quad with slope 1 and a ray in the second quad with slope -1 The +1 sends this graph up one It does not change the curve. The -flip the v downward The 3 changes the curve. Instead of the slope begin +/- 1, it...
*December 12, 2012*

**math**

(X)+(3x)+(5x)=27
*December 11, 2012*

**algebra**

8-3(21/8)
*December 11, 2012*

**trigonometric problem**

Tan32=h/x Tan22=h/(x+80) (Tan32)(x)=(tan22)(x+80) Solve for x and then for h
*December 11, 2012*

**math**

6y-6 Distributive property
*December 10, 2012*

**algebra 1**

Parallel means same slope M=-1/3 Point(-4,3) Plug into y=mx+b and find b 3=(-1/3)(-4)+b You should be able to finish from there
*December 10, 2012*

**math**

C= 3a 3c + 7a = 46000
*December 10, 2012*

**math very urgent**

You will get the same answer The extra would be putting your answer in lowest terms 6/9 + 4/9 = 10/9 12/18 + 8/18= 20/18 = 10/9
*December 10, 2012*

**ALGEBRA 2 urgent!!**

8x+5y=200 X=length of one rectangle Y=width of one rectangle Area = xy Y= (200-8x)/5 Area=x (200-8x)/5 Hope this gets you going
*December 10, 2012*

**college algebra**

Find f(1) and f(2) Find the slope f(1) - f(2) / 1 - 2 Write your equation Rate of change = slope
*December 10, 2012*

**Math**

D=4n-1 (1/3)less than (n/d) less than (1/5) (1/3) less than(n/(4n-1)) less than (1/5) Solve the between statement
*December 10, 2012*

**Math**

3+(x+y)
*December 8, 2012*

**maths**

40(base)=(1/2)(base)(height) 80(base)=(base)(height) Divide by base and they both drop out 80=height
*December 8, 2012*

**algebra**

Tan78.2=h/x. h=x(tan78.2) Tan17.6=h/(x+10). h=(x+10)(tan17.6) Need to solve for x and then go back for your height.
*December 8, 2012*

**math**

40625/100000 Reduce 40625=5^5 times 13 100000=5^5 times 2^5
*December 7, 2012*

**Calculus**

Find the der of f(x) Then substitute 2 into the der of f(x)
*December 7, 2012*

**Math**

Q = 11 + D 25Q + 10D = 765
*December 7, 2012*

**algebra 2**

Yes you factor 3k(k-5)(k+3) and your check says you did it correctly Now to find the zeros Set each factor = 0. And solve 3k=0. K=0 K-5=0. K=5 K+3=0. K=-3
*December 7, 2012*

**8th grade math**

Get a common denominator If you have a/6 and b/6 and c/6, then a:b:c would be the ratio and a+b+c=6
*December 7, 2012*

**algebra 2**

Yes (X-7)(x+8) Check by foiling X^2 +8x -7x -56 X^2 +x -56
*December 7, 2012*

**algebra 2**

Factor What factors multiply to equal 56 and subtract to equal 1?
*December 7, 2012*

**algebra 2**

It does not matter how large your numbers are,just follow the pattern
*December 7, 2012*

**algebra 2**

if your zeros are 5and8, then you say: X=5 and x=8 x-5=0 and x-8=0 (X-5)(x-8)=0
*December 7, 2012*

**math**

Looks fine to me d/dx sec x = (sec x tan x)(der of x)
*December 7, 2012*

**calculus**

I would use 2x as the with and have the radius of the circle be x. Your h would equal (1/2)(52-2x-3.14x) I think the x and h should be closer The closer the numbers, the max the area
*December 7, 2012*

**7th grade math**

Yes
*December 5, 2012*

**7th grade math mac please**

.12 or 12% .126 or 12.6%
*December 5, 2012*

**math**

20 - input 20 - 0=20 20 - 2=18 20 - 4 =16 f(n)=20-n
*December 5, 2012*

**7th grade math**

It is difference divided by start So now you need to take the 390 and divide by 3250 And take the 450 and divide by 3640 390 and 450 are the amount of increase not the percent of increase
*December 5, 2012*

**7th grade math Ms. Sue last two questions thanks**

16) you are given 730...so add the interest to it 15) correct
*December 5, 2012*

**7th grade math only 2 questions Ms, Sue please**

17) .07 times 22.00 will give you the amount of tax on the shirt That should get you going 18) difference / start 2000 to 2001. Would be (3640-3250)/3250 or 12% That should get you going
*December 5, 2012*

**math**

Trapezoid
*December 5, 2012*

**7th grade math Ms. Sue help please thanks**

11) correct 12) correct 13) correct 14) correct 15) if it is 15% off ,then the sale price is 100 -15 or 85% If it is 25% off, the sale price is 75% 16) your are asking for the FINAL balance not finding the interest
*December 5, 2012*

**Math**

-(-1)+6 =1+6
*December 5, 2012*

**I am really struggling on this problem - geometry**

Not sure what you are asking for There is only one point (0,0) that contains all 5 circles
*December 5, 2012*

**math**

. 88(150)+.94(150)+.90(150)+x(250)=.93(700) 132+141+135+x(250)=651 408+x(250)=651 x(250)=243 x=.972 Or you need 243points to earn a 97.2 percent
*December 5, 2012*

**maths**

5+25+5 30+5 35
*December 5, 2012*

**math 6th grade**

Equation of a line that divides the first and third quadrants in half Being 6 th grade it could be the beginning of function If x = 1 , then y = 1 If x= 2 , then y = 2
*December 4, 2012*

**Trig**

Cos (cos/sin)= cos^2/sin = (1 - sin^2x)/sin 1/sin sin^2/sin = csc x sin x
*December 4, 2012*

**math**

(50 miles x 5280 feet x 1 hour x 1 minute) / (1 hour x 1 mile x 60 minutes x 60 seconds)= 73 feet per second
*December 4, 2012*

**maths-geometry**

It is the definition of a parallelogram
*December 4, 2012*

**Math (trigonometric identities)**

18). Factor perfect square ( sin ^2x + cos^2x)^2 = 1^2=1
*December 4, 2012*

**Math (trigonometric identities)**

17). Multiply numerator and denominator by Sin x + 1 The numerator ( sin x + 1)(sin x -1) = sin ^2x -1 = -1(1 - sin^2x) = -cos^2x
*December 4, 2012*

**Math (trigonometric identities)**

21). Factor the numerator and the denominator (Sin x - 3)(sin x - 3) / (sin x - 3)(sin x + 3)
*December 4, 2012*

**Math (trigonometric identities)**

20). Sin^2x - sin x / cos x (1-cos^2x)cos x - sin x. All over cos x Cos x - cos^3x - sin x. All over cos x
*December 4, 2012*

**Math (trigonometric identities)**

19). 4sin^2x/cos^2x - cos^2x/cos^2x 4(1-cos^2x) - cos^2x. All over cos^2x 4 - 4cos^2x - cos^2x. All over cos^2x 4 - 5cos^2x. All over cos^2x 4/cos^2x - 5
*December 4, 2012*

**Algebra**

C = 24D + .75M C = 24(7) + .75(463) C = 168 + 347.25 C= 515.25
*December 4, 2012*

**precalculus**

Flip it X^2/ (3/2)
*December 4, 2012*

**Algebra URGENT**

Slope of the given line is 2 , therefore the slope of the perpendicular line is -(1/2) Use your point slope equation y -y =m(x - x) Y - 4 = -(1/2)(x - 3) 2(y - 4) = -1(x - 3). You are looking a proportion and cross multiplying 2y - 8 = -1x + 3 2y. =. -1x + 11 y. = -(1/2)x + (...
*December 4, 2012*

**Algebra URGENT**

Use your slope formula (-1 - 2.5) / (-.5 - 3) = -3.5/-3.5 = 1 Pick a point, does not matter which one, will get the same answer and use your point slope equation y - 2.5 = 1(x - 3) y = x - .5 y = x - (1/2)
*December 4, 2012*

**Physic**

A box with a weight of 22N falls through the air with a wind resistance of 14N, what is the mass of the box and the acceleration of the box?
*December 4, 2012*

**Physics**

A river flows due east at 1.42 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.9 m/s due north relative to the water. If the river is 389 m wide, how far downstream is the boat when it reaches the north shore?
*October 25, 2012*

**English**

1. When my teacher stopped [making reeds. Sending] all of her students on a wild goose chase. a. no change b. reeds. Thus sending c. reeds, she sent d. reeds, sending 2. They tend to take their time sending reeds to [you. I usually] have to wait a. no change b. you, usually I ...
*September 20, 2012*

**chemistry.**

the answer is -log(10.6) dont forget the negative no, it doesn't make any sense to me, but i just did that same problem and that was the right answer
*September 10, 2012*

**Information Systems in Organizations**

BBCDA
*May 17, 2012*

**Physics**

Mike pulls a 4.5 kg sled across level snow with a force of 250 N along a rope that is 35.0° above the horizontal. If the sled moves a distance of 63.8 m, how much work does Mike do?
*January 23, 2012*

**Math, Quadratics**

Current area = 200m2 [10m x 20m] New area = 400m2 [10y x 20y] So, 400 = 200y2 So, y2= 2 So, y = 1.41 So, each side must be increased by a factor 0f 1.41 times. I this correct or do they mean add the same length to each side?
*January 21, 2012*

**physics**

45.03756158
*October 20, 2011*

**statistics**

Miles per gallon. In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on 1152 vehicles. There are a number of outliers, mainly vehicles with very poor gas mileage. If we ignore the outliers, however, the combined city and highway ...
*September 21, 2011*

**math**

mr. pursley, have you ever worked geo., trig. etcwith no calu.s with the heat on , when it had to be right?wheather you blew up your target or something else or the bld. collapsed or was built in the correct place? i'm not an answer grazer, but qam an answer seeker.I'm...
*July 22, 2011*