Monday

April 21, 2014

April 21, 2014

Total # Posts: 218

**physics**

aww okay but thanks anyways

**physics-can anyone please help mee!!**

help me pleaseee, i don't get it!!!

**physics**

calculate the image positions and magnifications for an object 3cm tall and a mirror of focal length +12 with the object at the following positions: 2.5 f, 2.0 f, 1.5 f, 0.5 f. please help me don't understand it at all. it would be best if you can explain it to me rather t...

**chemistry**

what is a complete and incomplete combustion reaction ??

**math help**

factor: 1) (x+y)^2 - (a+b)^2 = [(x+y) - (a+b)] [(x+y) + (a+b)] = [x+y-a-b] [x+y+a+b] 2) 6x^4 - 6 = 6(x^4 - 1) = 6(x^2-1)(x^2+1) Is this right?

**math help!! ANYONE?!?!**

someone please help!!!!

**math help me pleasee!!**

help mee with the two questions, i don't get it and i have a test tomorrow!

**math help!!**

i also need help with this question factor: (x+y)^2-x-y

**math help!!**

Factor: 2(2x^2-x)^2-3(2x^2-x)-9

**math help!!**

okay thankyou so much!! :-)

**math help!!**

factor: (x^2+5x)^2 - 36 and (a-b)^2 - (c-d)^2 show the steps pleasee!

**math-still confused**

the answers at the back of the textbook say that the answer is (a-b+c-d)(a-b-c+d) i don't get it :$

**math help!**

how did you get that??

**math help**

factor: (a-b)^2 - (c-d)^2

**math help ASAP!!**

factor: 2m^3 - 7m^2n - 15mn^2

**math**

thankyou!

**math check my answer!**

no the answer is -5(2x-y)(2x+y) ^is that right??

**math**

is it -20x^2 + 5y^2 = -5(4x^2-y^2)

**math**

factor: -20x^2 + 5y^2

**math**

ohh ok thanks! :)

**math i don"t get it**

why does (y-z) turn to (y+z) ??

**math-help!!**

oh okay thats for the first question i think but what about this question x^2-(y - z)^2 ??

**math-help me please!!**

^is that right??

**math**

is the answer x^2 - (y - z)^2 = [x- (y-z)] [ x+ (y-z)] = (x-y-z) (x+y-z)

**math**

so how do i do x^2 - (y - z)^2

**math**

how do you factor: (a - b)^2 - c^2

**english**

when is a semi colon used?

**english anyone?? Ms.Sue? is this right?**

anyone help asap

**english**

then is it C and is the other one D??

**english- help me please**

choose the corect one. a) Prateek's and Skyler's computers have been upgraded to increase performance, capacity, and durability. b)Prateek and Skyler's computers have been upgraded to increase performance, capacity, and durability. c) Prateeks' and Skylers'...

**english**

choose the correct one. a) I wore all of the safety equipment for skateboarding; however, I still hurt myself. b) I wore all of the safety equipment for skateboarding, however, I still hurt myself. c) I wore all of the safety equipment for skateboarding however; I still hurt m...

**english**

oh kk thanks!

**english**

i have a question say you're writing a sentence such as "I ate apples, bananas, oranges, and grapes." is there a comma before 'and' or no?

**chemistry help**

what is lead (II) acetate + hydrogen sulphide --> Pb(C2H3O2)2 + H2S --> how do i figure it out?

**english-essay writing topic**

i dont have a dog and what is a thesis?

**english-essay writing topic**

whats a thesis? i forgot

**english-essay writing topic**

thanks for the help! :)

**english-essay writing topic**

i was kinda thinking of writing about procrastination and how i keep things till the last minute. since it has to be about a particular event i could write about a time that i have learnt not to keep things till the last minute. this is something that i've learnt myself an...

**english-essay writing topic**

someone please give me a good essay writing topic pleaseeee!

**english-essay writing topic**

it has to teach the audience something so i'm kinda stuck on what to do. please help me!

**english-essay writing topic**

i dont know please help me :(

**english-essay writing topic**

what is a good topic to write about for a personal essay? it has to be something that is meaningful. PLEASE HELP ASAP!!!

**physics**

Use the following information to calculate the speed of a ball in a pinball machine at a specific location. The ball is launched by using a spring (k = 684 N/m) compressed by 7.8 cm. Consider the starting position of the ball to be its location when the spring is compressed. H...

**physics**

A bead of mass m = 42.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground.

**physics lab**

The experiment done in lab is repeated, using a ball that has unknown mass m. You plot your data in the form of f 2 versus M/L, with f in rev/s, M in kg, and L in m. Your data falls close to a straight line that has slope 7.82 m/(kg · s2). Use g = 9.80 m/s2 and ca...

**physics**

A small block has a horizontal velocity of 4.00 m/s as it slides off the edge of a table. The table is a vertical distance of 0.95 m above the floor. If g = 9.80 m/s2, how far does the block travel horizontally while it is in the air?

**Math**

When Marcia started walking a 6 mile section of the trail, it took her 3.3 hours.After 1week her time was 3.1hours and after 2 weeks, it was 2.9 hours. If the pattern continues, what will Marcia's time be after 5 weeks?

**Science**

How are the reactants and products of photosynthesis and cellular respiration related?

**Stats**

The random variable U has mean 10 and standard deviation 5.The random variable V is de ned by V =12(U + 5).Find the mean and standard deviation of V.

**Statistics**

To CC, 2 is B, 6 is B

**Math**

Yes... But SOL math test told me 5/18 was not the answer....it is 2 and 1/2

**Math**

Ms. Sue I did but got it wrong was told the answer was 2 and 1/2.. don't understand?

**Math**

Which fraction is equivalent to 5/6 * 1/3 ? 5/18 2/5 1 and 1/6 2 and 1/2

**Math**

Which fraction is equivalent to 5/6 (divided sign) 1/3? 5/18 2/5 1and 1/6 2and1/2

**calc**

x^2 + √(x+y) + y^2 = 0; y is a differentiable function of x

**CALCULUS**

substitute 4 into x (4^2+3(4)+4)/(5(4)-12) =4

**Math**

factors of 10 (10,1,2,5) since you get 5-2 = 3...you would use 5,2 (x +5)*(x-2) = foil x^2 +(-2x)+5x-10 = x^2 + 3x - 10

**math 12**

answer is C, you can graph it, and see the extremas

**calc**

Integrate 1/(ln(x)); f(e^e)=1 please provide step! confused because of f(e^e)!

**calculus**

thank you

**math**

Given that a sports arena will have a 1400 meter perimeter and will have semi- circles at the ends with a possible rectangular area between the semi-circles, determine the dimensions of the rectangle and semi-circles that will maximize the total area.

**social studies**

Think about it, if China per say, attacks US, the US bases in the pacific islands would see it coming. Then the US would be prepared for an attack rather than be surprised by it. Also, they would have an easier trade route with the eastern Asian countries, like china, japan, r...

**math**

integrate (x^2 + 2x + 5) / (x - 2)

**Math**

you don't need to convert it, just answer it as 2 2/7 kilograms, the x is already in kilorgrams

**Math**

A polynomial is an expression which combines constants, variables and exponents using multiplication, addition and subtraction.

**Math**

almonds rate per kg is $8.50 , peanuts price per kg is $4.50 and avg price is $5.30 so subtract avg value from the given prices we will get the ratio of almonds to peanuts 8.50-5.30=3.2 and 5.30-4.50=0.8 so the ratio of almonds to peanuts is 3.2 : 0.8 but by the method the rat...

**calc**

Given X^2 + Y^2 = R^2, namely, a circle with center (0,0) and radius R, use integration to prove that the circle’s area equals πR2

**calc**

Integrate 2(x^2)e^g(x) where g(x)=4^(x^3)

**math**

the 3 is the base so log(base3)(...log(base/e)(x)

**math**

Find f’(x) if f(x) = 3^g(x) where g(x) = LOG_3(x^2 - √x + 4/x + 10*LOG_e(x))

**Chemistry**

How many grams of CaCl2 would be required to produce a 3.5M(molar) solution with a volume of 2.0L?

**science**

Why is it difficult to distinguish between some pure substances and solutions? What methods can overcome this to define if either it is a pure substance or solution?

**Math**

Thanks.

**Math**

A drama teacher needs to make 6 costumes for dancers in a play. Each costumes takes one and a half meters of cloth.The cloth is sold only by the yard.What is the best estimate of the number of yards the teacher must buy to make sure she has enough cloth for the six costumes?

**algebra (f°g) problem**

easy f(gx)(2) so f(x)=5(1/x) + 9 f(2)=5(1/2) + 9 f(2)= 2.5 + 9 = 11.5 or 23/2

**Maths**

cross multiply and simplify

**Please help me here!!! Maths**

(x^2-6x-15)=e^5 e^5 is approximately 148.41 so x^2-6x=148.41-15 x^2-6x = 133.41 x-6x = sqrt(133.41) -5x = 11.55 x = 11.55/-5 x = 2.31

**Math**

can you explain how you got that please?

**Math**

Ignoring the walls’ thickness, determine the outside dimensions that will minimize a closed box’s cost if it has a square base and top, if its volume is 32 cubic meters, and if the cost per square meter for the top, bottom, and sides respectively are $.03, $.04, and ...

**Math**

Ignoring the walls’ thickness, determine the outside dimensions that will minimize a closed box’s cost if it has a square base and top, if its volume is 32 cubic meters, and if the cost per square meter for the top, bottom, and sides respectively are $.03, $.04, and ...

**6grademath**

Thanks Ms.Sue

**6grademath**

Pattern of increasing perfect squares is shown25,36-----64,81,100,what is needed to square to find the missing term,5,6,7,8.....how do I find the answer.

**Math**

Gracie pattern of increasing perfect squares is shown 25,36,-------,64,81,100. What number does she need to to square to find the missing term? 5, 6,7,8

**math**

73. Cell Phone Plan A cell phone plan costs $3.95 per month plus $0.07 per minute. (Assume that a partial minute is not rounded up.) (a) During July, a person talks a total of 50 minutes. What is the charge? (b) Write an equation in slope–intercept form that gives the mon...

**PHYSICS HELP PLEASE!**

isn't the degree of 40 already given though? Why don't you do 12sin40?

**PHYSICS HELP PLEASE!**

A baseball is thrown at an angle of 40.0° above the horizontal. The horizontal component of the baseball’s initial velocity is 12.0 meters per second. What is the magnitude of the ball’s initial velocity?

**Physics ASAP PLEASE**

A baseball is thrown at an angle of 40.0° above the horizontal. The horizontal component of the baseball’s initial velocity is 12.0 meters per second. What is the magnitude of the ball’s initial velocity?

**physics**

A cart has a momentum of 10. kilogram meters per second east before a collision and a momentum of 5.0 kilogram meters per second west after the collision. The net charge in momentum of this cart is ? I am not sure how to solve.

**physics**

A loudspeaker has a movable diaphragm (cone) that vibrates back and forth in harmonic motion to produce sound. The displacement of the cone playing a sinusoidal test tone is shown above. Find the following values from the graph. (NOTE: t = 0.03 sec, and the vertical axis of th...

**physics**

A horizontal spring mass system is set up to keep time so that it goes from one side to the other in 6 seconds. The mass used in this system is 0.69 kg. The distance from one side to the other is 2.4 m. What spring constant should be used if it is to oscillate correctly? k = N...

**physics**

A pendulum and a mass spring system are both undergoing simple harmonic motion on Earth (use g = 10 N/kg). It is observed that every time the pendulum goes back and forth, the spring has gone up and down 14 times. If the pendulum has a length of 5 meters and the mass is 100 g,...

**airthmetic progression**

If m, n are natural numbers, m > n, sum of mth and nth term of an increasing AP is 2m and their product is m^2–- n^2, then what is the (m+n)th term of the A.P.?

**Math**

Rick's car gets 29.7 miles per gallon on the highway.If his fuel tanks hold10.45 gallons,then how far can he travel on one full tank.?

**Math**

Rick's car gets 29.7 miles per gallon on the highway.If his fuel tanks hold10.45 gallons,then how far can he travel on one full tank.?

**Chemistry**

In a reaction between methane, CH4 and chlorine, Cl2 four products can form: CH3Cl, CH2Cl2 + CHCl3 and CCl4. In a particular instance, 20.8 g of CH4 were allowed to react with excess Cl2 and gave 5.0 g CH3Cl, 25.5 g CH2Cl2+ and 59.0 g CHCl3+ all the CH4 reacted. a)How many gra...

**Chemistry**

In an experiment a student allowed benzene C6H6, TO REACT WITH EXCESS BROMINE BR2, in an attempt to prepare bromobenzene C6H5Br. This reaction also produced as a by-product, dibromobenzene, C6H4Br2, On the basis of the equation. C6H6 + Br2 -> c6h5Br + H Br a)What is the max...

**math**

tom had 7/8 of a cup of lemon juice.after making a pie he had 1/2 cup of lemon juice left.how much lemon juice did he use in the pie?

**math**

a giant truck use tires with a diameter of 12.5 feet, find the area of a wheel with this tire.

**math**

jones bought 3 1/8 pounds of candies, she gave away 3/5 of the candy,how much candy was left over?

**math**

tomatoes are selling for $1.95 per pound.can you buy 2 1/4 pounds if you only have $ 4.00?