Saturday
April 19, 2014

Posts by Elisa


Total # Posts: 147

French
"Sont" of the verb "Être"

math
28E − 7 = 0 would I add 7 to the 0 then divide 28 by 7 but the answer don't check out

math
thanks Steve I will

math
i think it is 2x^3-10x+12--am i right i guess i just need confirmation please...last one and thsnk you so much

math
Simplify the expression. (x − 3)(2x − 4) − (x + 2)(x − 6)=

math
please simplify the expreesion: (2x − 1)(x^2 + 3x − 3)=

math
Simplify the expression. 5(x − 1) − 3(x^2 + 4x + 5)- 8(x+7)=

math
please help me w/ this one: (x+6y-5z) - (x-2y+4z)=

math
can you help me factor this one? x^2 + x - 20=?

math
please factor this: x^2 + 9x +18=?

math
please factor: x^2-6x-7

math
please help simplify 5(x-1) - 3(x^2 + 4x + 5) - 8(x + 7)

Algebra
A dress normally selling for $60 was on sale for $48. What was the percent discount?

Algebra
A box contains 4 quaters, 3 dimes, and 2 nickels. you draw out two coins and keep them both. What is the probability that both are quaters?

algebra
At 3:00 pm the temperature was 2* below zero. It then fell 4* in the next 2 hours. what was the temperature at 5:00pm?

Physics
An autographed baseball rolls off of a 1.1 m high desk and strikes the floor 0.15 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s

Chemistry
Is this reaction exothermic or endothermic? Fe(NO3)3+ NaSCN

Chemistry
Acid spills are often neutralized with sodium carbonate. For example Na2CO3 (s) + H2SO4 (aq)  Na2SO4 (aq) + CO2 (g) + H2O (l) An instructor dropped a 2.50 L bottle of 18.0 M H2SO4 on a cement floor. How much sodium carbonate would be required to neutralize it?

Maths
What is greater 5\8 or 2/3

american history
I must provide a historical overview of the evolution of U.S. cities from colonial times to the present. could you please provide me with a starting point and some web resources. thanks.

physics
A ball thrown straight upward returns to its original level in 2.50s. A second ball is thrown at an angle of 36.degrees above the horizontal. What is the initial speed of the second ball if it also returns to its original level in 2.50

Algebra
Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this better. Explain your...

algebra
The length of a rectangle is 2 meters more than its width. If the area is 63 square meters, what are the length and width?

algebra
A 125-ft diagonal brace on a bridge connects a support of the center of the bridge to a side support on the bridge. The horizontal distance that it spans is 25 ft longer than the height that it reaches on the side of the bridge. Find the horizontal and vertical distances spann...

algebra
Use the “difference of squares” rule to factor the following expression: 100a^6-64b^8

algebra
Megan factored the expression 72x^2-43x+6 as (9x-3)(8x-2). But when Jacob applied the FOIL principle and multiplied out (9x-3)(8x-2), he got72x^2-42x+6; thus, Megan’s solution does not appear to check. Why is that? Please help Megan to understand this better. Explain your...

algebra
Factor out the greatest common factor from the expression 9a2b3 – 12a2b4 – 24a3b

algebra
Factor out the greatest common factor from the expression 36x^3-30x^2

algebra
Factor the expression 16x^2-72xy+81y^2 into a product of binomials.

algebra
Factor the following expression completely: 45x^3y – 80xy

the quadratic formula
thank you the site is very helpful.

the quadratic formula
15t^2+7t=2

applications involving quadratic
thats what my mathbook said. That why I needed help thank you bobpursley.

applications involving quadratic
Abby rows 10 km upstream and 10 km back in a total time of 3 hr. The speed of the river is 5km/h. Find Abby’s speed in still water.

Intermedia Algebra
Solve by factoring: 2a^2 − 3a = −5

Intermidia Algebra
Andrew factored the expression -12x^3-28x^2-3x as -4x (3x^2-7x+9). But when Melissa applied the distributive law and multiplied out -4x (3x^2-7x+9), she got -12x^3+28x^2-36x; thus, Andrew’s solution does not appear to check. Why is that? Please help Andrew to understand t...

Intermidiate Algebra
The area of a rectangular athletic field is represented by the expression 25y^2-4z^2 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct units with your so...

intermidiate Algebra
The area of a rectangular athletic field is represented by the expression 16y^7+32y^5+80y^3 square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense “length times width”) of the athletic field. Include correct units with ...

Intermediate Algebra
Factor by grouping, if possible, and check 5x3 + 4x2 − 10x – 8

Intermediate Algebra
Factor completely. If a polynomial is prime, state this 9 + 8t^2 - 18t

Intermiediate Algebra
Factor completely. Remember to look first for a common factor. If a polynomial is prime, state this -4t^2 + 64

chemistry
what volume of oxygen gas is needed to completely combst 0.202L of butane (c4h10)gas?

Please help - math
its --> t - (64/t^2) could you please solve it..

Please help - math
A particle is moving so that its velocity, v(t) = t-64/t^2 for 2≤t≤6. find the total distance traveled by the particle.

Math
A particle is moving so that its velocity, v(t) = t-64/t^2 for 2≤t≤6. find the total distance traveled by the particle.

math
i have a feeling some thing is wrong in your assumption of the question .. could u please recheck ?

math
yes i did mean v(t) = 8 t^3 in the x direction.

math
A particle moves along the s-axis. Use the given information to find the position of the particle. v(t)=8t3 ; s(0) = 5.

Calc - Please help
A particle moves along the s-axis. Use the given information to find the position of the particle. v(t) = 8t3; s(0) = 5.

Calculus
Suppose that the number of bacteria in a culture at time t is given by N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and SMALLEST number of bacteria in the culture during the time interval 0 ≤ t ≤ 140

Calculus
Suppose that the number of bacteria in a culture at time t is given by N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and SMALLEST number of bacteria in the culture during the time interval 0 ≤ t ≤ 140

Calculus
Suppose that the number of bacteria in a culture at time t is given by N = 4950 ( 28 + t*e ^(-t/24)) Find the LARGEST and SMALLEST number of bacteria in the culture during the time interval 0 ≤ t ≤ 140 .

French
"Le ferez-vous après", pas "apré" ><"

MATH
Answer 11 hotdogs

Pre Algebra
The first side of a triangle is 8 meters longer than twice the second side. The third side is 3 times the second side. The perimeter is 128 meters. Find the lengths of the three sides.

Language
Instead, he enjoyed looking for hours and hours... In this phrase is the word looking a noun, adjective,verb, or an adverb?

Algebra 1
yes, I did see the reply earlier. However, I'm still having trouble figuring out how to do the work. thanks for your help.

Algebra 1
Write the equation in standard form for the line that passes through (6, -1) and (10,-*) So far I have -8-1 is -9 and 10-6 is 4, is the -9 correct? Then y plus 10 equals 9/4(x - 8) Then multiply by 2 so 2y plus 20 equals 18/4x - 146/4 Is this correct so far?

Algebra 1
Graph y-7 equals 9(x plus 6) So 9x plus 54 54 plus 7 is 61 So y equals 9x plus 61. is it correct?

Algebra 1
Write an equation in standard form for the line through (9, -2) and (13, -8) Do I solve this by doing y2-y1/x2-x1. That would give me the slope and then plug in the 13 for the x and -8 for the y?

Algebra 1
Ok, I get it now, thanks!

Algebra 1
Could you please show me how to do this. Write an equation of the vertical and horizontal lines that pass through the given point (6,-6) y equals? x equals ?

algebra
Graphthe equation y plus 6 equals 1/8(x-2 1/8x - 2/8 add 2/8 to 6, so 61 times 8/8 makes it 48/8 plus 2/8 is 50/8 mx plus c would be 1/8 plus 50/8. Is this correct so afr? If so how do I graph 50/8? Do I just put at 50 on the y axis and do 1/8 rise over run?

algebra 1
Write an equation in point slope for for the line thatpasses through (4,5) and has a slope of 6 I got -19. Is this correct?

fraction help algebra
Write the equation passing through the points (-9, 6 ) and (1, -5). The worksheet has multiple choice, so I know y intercept is either 39/10 or -39/10. I have -11/10x plus b then -11 (1) is -11 10(1) is 10 Then -5 plus 11/10 I change -5 to -15/10 but I'm getting -26/10. Wh...

algebra again
I think I've got it, is it -5/-2 (2) is -10/2 so 5 -2-5 is -7 so y equals 5x -7

algebra again
Write an equation that passes through the points (4, 3) and (2, -2) I have -2 -3 is -5 and 2-4 is -2 so y equals -5/2x plus b. I put in 2,-2 into the equation to get the y intercept, so 2 equals -5/2 times 2 plus b -5/2(2) is -10/-4 reduce to -5/-2 Now add 5/2 to -2 Please hel...

algebra 1
Write the equation for the line that passes through the point (6,7) and has a slope of 1/2. Give as a simplified fraction. Again, I have y equals 1/2x but not sure for the rest.

algebra
Write an equation of a line that passes through the points (-6,7) and has a slope of -4 How do I do this? it would be y equals -4x but not sure how to do the rest.

Algebra
How come (2xy^2)^3 is equal to 8x^3 y-6? I thought that six exponent should be a five since you add them together. So 2 and 3 should be five. But why is this?

math
Okay great that makes more since thanks

math
Hi! I have a question Heres the problem: 3-2[6-(4y-1)] I got -8y-11 but it wasnt right and I dont know what i did wrong help please!

math
in a school of 100 students, 59 are taking math, 51 are in english, 35 are in history, 24 are in both math and english, 19 are in both english and history, 13 in both math and history, and 11 in all three courses. how many students are taking: a) none of the classes? b) only m...

physics
A stone is thrown downward into a well with an initial speed of 5.00 m/s. The sound of splash is heard 1.50 s later. Find the depth of the well if the air temperature is 15.0 ˚C?

physics
A uniform string fixed at one end passes over a pulley and then is attached to a hanging object. The string is horizontal between the fixed end and the pulley. When you let the hanging object oscillate in the vertical plane, the fundamental frequency of the horizontal part of ...

physics
A bat flying at 6.00 m/s emits a chirp at 40.0 kHz. If this sound pulse is reflected by an insect moving away from the bat at 2.00 m/s, what is the frequency of the echo received by the bat? Assume the air temperature is 25.0 ˚C. Would I need two different equations for t...

physics
A simple pendulum with a length of 1.50 m is suspended from the ceiling of a train. What is the period of simple harmonic motion for the pendulum if the train is moving up an incline of 15.0˚ with an acceleration of 3.00 m/s²? Don't know how to do, please help

physics
A bat flying at 5.0 m/s emits a chirp at 35 kHz. If this sound pulse is reflected by a wall, what is the frequency of the echo received by the bat? I keep getting the wrong answer, don't understand.

Physics
A simple pendulum is 9.00 m long. (a) What is the period of simple harmonic motion for this pendulum if it is hanging in an elevator accelerating upward at 2.00 m/s2? I keep getting 6.7, but it's wrong

Physics
Nope that doesn't give the right answer, but thanks lots for your help!

Physics
That is the correct speed, but I don't know how to find the depth of the well, which is what the question is asking for.

Physics
Please help. I got 338.82 for the velocity and wanted to get the distance, but I can't seem to do it because I don't have the wavelength. Please help! A stone is dropped from rest into a well. The sound of the splash is heard exactly 2.20 s later. Find the depth of the...

physics: drwls
drwls for the question below, the answer seems to be wrong: The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. It asks for the answe...

Physics
Can't get correct answer An object weighing 340 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 260 N. Immersed in oil, the object weighs 290 N. (a) Find the density of the object. kg/m3 (b) Find the density of the oil...

physics
Thank you very much!

physics
Determine the elongation of the rod in if it is under a tension of 5.7E10^3 N. The rod is made of aluminum and copper. From the aluminum to the copper section it measures 1.3m and from the copper section to the end it measures 2.6m with a radius of 0.2cm. Can someone please he...

physics
Sorry about that!

physics
Determine the elongation of the rod in if it is under a tension of 5.7E10^3 N. The rod is made of aluminum and copper. From the aluminum to the copper section it measures 1.3m and from the copper section to the end it measures 2.6m with a radius of 0.2cm. Can someone please he...

Physics
The four tires of an automobile are inflated to a gauge pressure of 1.8E10^5 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. I was helped with this before, but the answer was wrong. Can someone please help me, I keep do...

physics
The four tires of an automobile are inflated to a gauge pressure of 1.8 multiplied by 105 Pa. Each tire has an area of 0.025 m2 in contact with the ground. Determine the weight of the automobile. No idea how to start, please help.

physics
A 175 kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the merry-go-round from rest to a...

Gen Chem2
What would the two half reactions look like for Sr(s) reacting with excess 1M H4NHCO3. I really do not understand. It says that a precipitate and a flammable gas are among the products.

physics
1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? 2. If ...

physics
1. It has been suggested that rotating cylinders about 11 mi long and 5.2 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth? 2. If ...

physics
In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular speed of 5.00 rad/s. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider...

physics
The force shown in the force-time diagram in Figure P6.11 acts on a 1.4 kg object. (a) Find the impulse of the force. (b) Find the final velocity of the mass if it is initially at rest. (c) Find the final velocity of the mass if it is initially moving along the x axis with a v...

Gen chem 2
D-Glucose, C6H12O6, is an aldohexose sugar which occurs commonly in nature. In a text or reference book look up "-D-(+)-Glucose and write its correct, complete Lewis structure. Then “parcel” e’s to determine the correct (O) no. for each C atom in this molec...

physics
A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor?

physics
An archer shoots an arrow toward a 300 g target that is sliding in her direction at a speed of 2.35 m/s on a smooth, slippery surface. The 22.5 g arrow is shot with a speed of 41.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the arro...

physics
1. A 10.0 g object moving to the right at 25.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 36.0 cm/s. Find the velocity of each object after the collision. 10.0 g object: 15.0g object: 2. A dentist's drill starts from re...

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