# Posts by Elisa

Total # Posts: 157

**math**

Twenty-five is equal to one more than eight times a number. What is the number?

*December 7, 2016*

**Math**

The ratio of golf balls to tennis balls in the coach's bag is 20 to 5. If there are 100 golf balls in the bag, how many tennis balls are in the bag?

*May 16, 2016*

**Math**

Nelly spends 25% of her free time surfing the Internet. If she spends approximately 1 hour per day surfing the Internet, how many hours of free time does she have each day?

*May 14, 2016*

**Math**

Brent counted 10 red cards, 10 black cards, and 20 blue cards in a deck of cards. What is the ratio of red cards to the other cards?

*May 14, 2016*

**Physics**

How does an electric motor work, linking to the theory of electromagnetism? I have already identified a few laws: -Ohms -Faraday's

*October 24, 2015*

**Algebra 2**

Solve Quadratic System x^2+y^2=2 x^2-6y=10 Please show work!!!

*November 23, 2014*

**Math**

I'm confused can someone help me plz.

*November 5, 2014*

**Education**

thank you Writeacher for your help. can you also explain this to me, How do young children develop pre-prejudical behavior? What could you do to modify this behavior?

*September 24, 2014*

**Education**

Personal Reflection: what attitudes, skills, and values, do you do as an individual, need to develop in order to implement a multicultural/anti-bias curriculum? I have to write a paper on that question and I don't understand what this mean? Can anyone explain to me?

*September 24, 2014*

**Math**

Tuesday May, 16 2016 Thank u for helping me wen I forgot how for homework ♡♡ :-D ;-)

*September 23, 2014*

**MATH HW HELP!!**

stuart daniels estimates that he will need 25,000 to set up a small business in 7 years. how much must Stuart invest now at 12%interest compounded quarterly to achieve his goal?

*May 20, 2014*

**French**

"Sont" of the verb "Être"

*December 4, 2013*

**math**

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

*October 21, 2013*

**math**

thanks Steve I will

*October 21, 2013*

**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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

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

*October 21, 2013*

**math**

please factor: x^2-6x-7

*October 20, 2013*

**math**

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

*October 20, 2013*

**Algebra**

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

*August 10, 2013*

**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?

*August 8, 2013*

**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?

*August 8, 2013*

**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

*January 22, 2013*

**Chemistry**

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

*December 11, 2012*

**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?

*March 18, 2012*

**Maths**

What is greater 5\8 or 2/3

*February 15, 2012*

**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.

*December 1, 2011*

**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

*September 17, 2011*

**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...

*June 20, 2011*

**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?

*June 19, 2011*

**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 ...

*June 19, 2011*

**algebra**

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

*June 19, 2011*

**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...

*June 19, 2011*

**algebra**

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

*June 19, 2011*

**algebra**

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

*June 19, 2011*

**algebra**

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

*June 19, 2011*

**algebra**

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

*June 19, 2011*

**the quadratic formula**

thank you the site is very helpful.

*June 19, 2011*

**the quadratic formula**

15t^2+7t=2

*June 19, 2011*

**applications involving quadratic**

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

*June 19, 2011*

**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.

*June 19, 2011*

**Intermedia Algebra**

Solve by factoring: 2a^2 − 3a = −5

*June 19, 2011*

**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 ...

*June 19, 2011*

**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 ...

*June 19, 2011*

**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 ...

*June 19, 2011*

**Intermediate Algebra**

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

*June 17, 2011*

**Intermediate Algebra**

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

*June 17, 2011*

**Intermiediate Algebra**

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

*June 17, 2011*

**chemistry**

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

*May 20, 2011*

**Please help - math**

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

*December 19, 2010*

**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.

*December 19, 2010*

**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.

*December 19, 2010*

**math**

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

*December 19, 2010*

**math**

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

*December 19, 2010*

**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.

*December 19, 2010*

**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.

*December 19, 2010*

**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

*November 29, 2010*

**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

*November 29, 2010*

**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 .

*November 29, 2010*

**French**

"Le ferez-vous après", pas "apré" ><"

*September 24, 2010*

**MATH**

Answer 11 hotdogs

*September 5, 2010*

**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.

*January 13, 2010*

**Language**

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

*October 6, 2009*

**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.

*September 29, 2009*

**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?

*September 29, 2009*

**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?

*September 29, 2009*

**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?

*September 29, 2009*

**Algebra 1**

Ok, I get it now, thanks!

*September 29, 2009*

**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 ?

*September 29, 2009*

**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?

*September 27, 2009*

**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?

*September 27, 2009*

**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. ...

*September 26, 2009*

**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

*September 26, 2009*

**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 ...

*September 26, 2009*

**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.

*September 26, 2009*

**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.

*September 26, 2009*

**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?

*September 12, 2009*

**math**

Okay great that makes more since thanks

*August 16, 2009*

**math**

Hi! I have a question Heres the problem: 3-2[6-(4y-1)] I got -8y-11 but it wasn't right and I don't know what i did wrong help please!

*August 16, 2009*

**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 ...

*October 18, 2008*

**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?

*August 6, 2008*

**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 ...

*August 6, 2008*

**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 ...

*August 6, 2008*

**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

*August 6, 2008*

**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.

*August 4, 2008*

**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

*August 4, 2008*

**Physics**

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

*August 4, 2008*

**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.

*August 4, 2008*

**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...

*August 4, 2008*

**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 ...

*July 22, 2008*

**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...

*July 22, 2008*

**physics**

Thank you very much!

*July 21, 2008*

**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 ...

*July 21, 2008*

**physics**

Sorry about that!

*July 21, 2008*

**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 ...

*July 21, 2008*

**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 ...

*July 21, 2008*