Saturday
December 20, 2014

Posts by Mac


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
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

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