Tuesday

September 27, 2016
Total # Posts: 2,817

**algebra**

If the area of a square is 9x2-12xy+4y2, what is the perimeter of the square in terms of x and y. *its 9x squared and 4y squared i have several problems like this on my homework if you show me how to do this one im sure i could figure out the rest

*October 6, 2010*

**algebra**

Elliot is 5 times as old as Sid. Ten years from now, Elliot will be at least 3 times as old as Sid will be then. At least how old is each person now?

*October 6, 2010*

**Physics**

You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...

*October 6, 2010*

**Physics**

i do not think that is correct because i am getting the incorrect answer.

*October 6, 2010*

**Physics**

You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...

*October 6, 2010*

**Physics**

You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. You are 133 m from the intersection when you begin to apply ...

*October 6, 2010*

**Physics**

A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...

*October 6, 2010*

**Physics**

nope :(

*October 5, 2010*

**Physics**

kk got that. did you get number 18?

*October 5, 2010*

**Physics**

okay ! and which q'n did u get 255 m for?

*October 5, 2010*

**Physics**

k i got this one.. find the t it takes for each runner using t=d/v....then subtract the times, and you have the answer !

*October 5, 2010*

**Physics**

A speedboat starts from rest and accelerates at +2.07 m/s2 for 7.00 s. At the end of this time, the boat continues for an additional 6.00 s with an acceleration of +0.523 m/s2. Following this, the boat accelerates at -1.55 m/s2 for 8.00 s. What is the velocity of the boat at t...

*October 5, 2010*

**Physics**

You are driving to the grocery store at 14.8 m/s. You are 140.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.440 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply...

*October 5, 2010*

**Physics**

alrighttyy. did u get number 13, 14 or 18?

*October 5, 2010*

**Physics**

okay thanks ! was your velocity really small and negative then?

*October 5, 2010*

**Physics**

okay but what does 'u' refer to? Also, for question #7, how did you figure out the total velocity for the entire trip?

*October 5, 2010*

**Physics**

oh okay i got that ! thanks. for the second part..how long it takes to reach the bottom.. do u use t = d/v?

*October 5, 2010*

**Physics**

yes. but how did you get it because i have different numbers

*October 5, 2010*

**Physics**

I have this same question.. got it wrong

*October 5, 2010*

**Science**

thks

*October 5, 2010*

**Science**

What is a experimental investigation? What is a descriptive investigation?

*October 5, 2010*

**Physics**

Superwoman is hovering above the ground when a person free-falling goes by her at a terminal velocity of 140 km/h. Unfortunately, the parachute does not open. Fortunately, Superwoman is around. If it takes her 1.9 s to realize the person is in distress, what must her ...

*October 3, 2010*

**Biology**

How does a plant growth regulator differ from a plant growth hormone?

*October 3, 2010*

**AP world history**

i have to write a DBQ promt question for the interaction between humans and the enviornment (demography and disease, migration,technology, and patterns of settlement) about roman empire

*October 3, 2010*

**Physics**

Two rugby players are running towards each other. They are 37 m apart. If one is accelerating from rest at 0.5 m/s^2 and the other was already moving at 3.1 m/s and maintains her speed, a)how long before they crunch together? b)How fast was the accelerating player going? c)How...

*October 2, 2010*

**Physics**

A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s^2, how long does it take to catch the speeder?

*October 2, 2010*

**7th grade**

5x-10-2x+7=0 3x-3=0 3x=3 x=1

*October 1, 2010*

**Physics**

Thanks!

*October 1, 2010*

**Physics**

On a velocity-time graph of a person's walk, if a person is slowing down in the positive direction, then acceleration is in the negative direction.For example, the positive direction is [E]. If a person's acceleration is -1m/s^2, then it is 1 m/s^2 [West]. But that ...

*October 1, 2010*

**Math**

How did u get the answer?

*October 1, 2010*

**Math**

Ali did his homework at school with a graphing calculator. He determined that the equation of the line of best fit for some data was y=2.63x-1.29. Once he got home, he realized he had mixed up the independent and dependent variables. Write the correct equation for the relation...

*October 1, 2010*

**Math**

If f(x)=x^2, what is the domain and range of y=0.5f(3(x-4))-1?

*September 30, 2010*

**Physics**

Thanks!

*September 30, 2010*

**Physics**

If 100 m sprinters accelerate from rest for 3.5 s at 2.8 m/s^2, how far have they run to this point? How long will it take them to complete the 100 m sprint, assuming they maintain their speed the rest of the way? I found the distance, which is 17 m, and the distance they ...

*September 30, 2010*

**Economics**

Name 2 government bodies or agencies that have an impact on the national housing market. Explain the role of each body or agency in relation to the housing market.

*September 29, 2010*

**physics**

I don't understand this part.... 2) force*distance=1/2 m v^2 force= mass*(4g)/2d= 2*g*mass/.74

*September 29, 2010*

**chem 101**

yay i was right, thank you very much for your help

*September 29, 2010*

**chem 101**

a.write a balanced chemical equation for the complete combustion of sucrose. --- this part of the question i got help on, and thank you b. if combustion is complete, a brown liquid caramel might form, followed by a brown/black solid. what would be the major component of the ...

*September 29, 2010*

**chem 101**

if combustion is complete, a brown liquid caramel might form, followed by a brown/black solid. what would be the major component of the solid?

*September 29, 2010*

**chem 101**

write a balanced chemical equation for the complete combustion of sucrose.

*September 29, 2010*

**Economics**

How can you use information about the business cycle when making a decision about a large purchase?

*September 28, 2010*

**math**

explain why 1734 is greater then 175

*September 27, 2010*

**italian**

How do i say my name in italian.

*September 27, 2010*

**arithmetic**

Thanks 68%

*September 23, 2010*

**arithmetic**

Thanks

*September 23, 2010*

**arithmetic**

I got 102 questions right out of 150 on a math test. What percentage did I get on theis test?

*September 23, 2010*

**chemistry**

1.70

*September 22, 2010*

**geography**

Rivers bring water for ______ and ____. ?????? Fill in the blank with no options.

*September 21, 2010*

**Geography**

What is the second longest river in North America?

*September 21, 2010*

**physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 21 m/s at an angle of 58° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed is ...

*September 20, 2010*

**Physics**

Dini is riding her bike eastward at a constant 9.5 m/s when a car pulls out of a side street a short distance in front of her. Dini applies her brakes and manages to stop in 2.5 s, just in time to avoid running into the car. Calculate Dini's average acceleration. The ...

*September 20, 2010*

**12th grade maths**

How do you express x^2-49? (x+7)(x-7) X(times)X = X^2 (positive 7) (times) (negative 7)= -49 X^2-49 is (x+7)(x-7).

*September 20, 2010*

**Physics**

Sandy is racing her sister home, but they each take a different route. Who will win: the one with the greatest average speed or the one with the greatest average velocity? Explain, using some sample numbers.

*September 19, 2010*

**Biology**

In which of the following environments would you be most likely to find non-vascular plants: in desert soil, near the snow line on a mountain, on a sandy ocean beach, or on the forest floor? Give reasons for your answer.

*September 19, 2010*

**Physics**

It's in my science textbook.

*September 18, 2010*

**Physics**

a)Why is it more important for an aircraft pilot to know the wind velocity than the wind speed? b)Why is it more important for all pilots to use the same conventions when describing velocity?

*September 18, 2010*

**Biology**

Are dicots divided into woody and herbaceous stems?

*September 18, 2010*

**Physics**

Can the average velocity of any trip be greater than the average speed of the trip? Explain.

*September 17, 2010*

**sunshine mateh**

put one digit from {1,0,3,7} in each box to get the correct long division problem

*September 16, 2010*

**Chemistry**

how many electrons are in 3.70 x 10^23 atoms of carbon 13?

*September 16, 2010*

**MATH**

whats the value of 0.4297

*September 14, 2010*

**Physics**

A fisher sets out to check his fishing nets and heads 15 km/h [N] for 0.20 h. After stopping for 0.50h, he travels at 12 km/h [E] for 0.10 h to get to the next set of fishing nets. a) What is the fisher's displacement to get to the first set of nets? ( I got 3 km [N]) b) ...

*September 14, 2010*

**AP Stats**

The distribution of heights of adult American men is approximately normal with mean 69 inches and standard deviation 2.5 inches. Use the 68-95-99.7 rule to answer the following questions: (d) A height of 71.5 inches corresponds to what percentile of adult male American heights...

*September 14, 2010*

**science**

how are alkali metals and alkali earth metals different?

*September 14, 2010*

**chemistry**

How many milliliters of a 0.50 M solution contain 14.0 g of BaCl2 (Barium Chloride)?

*September 14, 2010*

**Physics**

A student travels 6.0 m [E] in 3.0 s and then 10.0 m [N] in 4.0 s. Draw a vector diagram to determine the resultant displacement. Q: How do you know where the starting point is on the graph?

*September 14, 2010*

**Chemistry**

280.43g of NaCl is needed to raise the boiling point to 100 degrees.

*September 14, 2010*

**science **

how is it possible to have a negative sun angle?

*September 14, 2010*

**AP Stats**

I generally know how to use the normalcdf function on my calculator, but how to I find the area under a normal curve if there is no lower limit or no upper limit? For instance, we are required to use a calculator on this problem: Find the area under the standard normal curve ...

*September 13, 2010*

**physics**

my answer for this question came out to be 1.16 m. However when I plug it into the Physics homework program it say incorrect. My equation for t was: 1.25 m = 0m + 4.952sin34t - 4.9t^2 and then I did the quadratic equation and got t= .28258 I then did the horizontal distance ...

*September 12, 2010*

**physics**

A small steel ball bearing with a mass of 28.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.25 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 34.0 deg ...

*September 12, 2010*

**physics**

A small steel ball bearing with a mass of 28.0 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.25 m. Calculate the horizontal distance the ball would travel if the same spring were aimed 34.0 deg ...

*September 12, 2010*

**Physics**

If you can throw a ball vertically upward to a height h = 30.1 m, what is the maximum horizontal range over which you can throw the same ball, assuming you throw it at the same initial speed

*September 12, 2010*

**Physics**

A Hollywood daredevil plans to jump the canyon shown in the figure on a motorcycle. There is a 15. m drop and the horizontal distance originally planned was 60. m but it turns out the canyon is really 65.7 m across. If he desires a 3.1-second flight time, what is the correct ...

*September 12, 2010*

**Physics**

Convert 341 m/s into km/h. (I have to leave the final answer to the correct number of digits according to the certainty rule for multiplying and dividing)

*September 9, 2010*

**Physics**

Oh, okay thanks!

*September 8, 2010*

**Physics**

Calculate the answer for the following question and state the answer with the correct certainty and units. Given the values of b and h, find A. b=3.2 cm, h=10.1 cm A=1/2bh The answer is 16 cm^2, which was rounded to two significant digits from 16.16 cm^2,because 3.2 has a ...

*September 8, 2010*

**chemistry**

when acidified potassium dichromate (VI) is added to iron(II) sulfate why does a redox reaction occur? How about if ammonia is added to iron(II) sulfate?

*September 7, 2010*

**s.s**

thanks

*September 6, 2010*

**s.s**

What is the definition for a scale on a map?

*September 6, 2010*

**physics**

sorry cant answer this question the picture does not show thanks!

*September 6, 2010*

**physics**

you can`t because the height of the ball is higher than the ball bounces thanks!

*September 6, 2010*

**science**

not sure,but i would like to ask you a question about science would that be ok? thanks!

*September 5, 2010*

**social studies**

what is a legand

*September 2, 2010*

**Chemistry **

net ionic equation of Na2CO3+2HC2H3O2-->CO2+h2o+2Na2H3O2

*September 1, 2010*

**Math**

Thank you!

*August 23, 2010*

**Math**

Determine the equation of the parabola with roots 2+sqrt(3) and 2-sqrt(3), and passing through the point (2,5).

*August 23, 2010*

**Math**

Bobpursley, how do you know that the peak is at (3,15)?

*August 22, 2010*

**Math**

An engineer is designing a parabolic arch. The arch must be 15 m high, and 6 m wide at a height of 8 m. a) Determine a quadratic function that satisfies these conditions. I've got : 8=a(6-h)^2+15, but i don't know what to do next.

*August 22, 2010*

**Math**

Question: A tunnel with a parabolic arch is 12 m wide. If the height of the arch 4 m from the left edge is 6 m, can a truck that is 5 m tall and 3.5 m wide pass through the tunnel? Justify your decision. I drew the graph of the arch with x-intercepts (0,0) and (12,0) , and ...

*August 19, 2010*

**Math**

Thanks!

*August 17, 2010*

**Math**

If f(x)=x^2-6x+14 and g(x)=-x^2-20x-k, determine the value of k so that there is exactly one point of intersection between the two parabolas.

*August 17, 2010*

**algebra1**

how do you simply this? square root of 1500/20 (the / means over) please show steps. thanks!

*August 11, 2010*

**chemistry**

Why does a certain reagent shift the ionic reaction in the desired direction?

*August 4, 2010*

**business**

International issues of social responsibility and ethical behavior are:

*August 1, 2010*

**Physics**

I have two questions, both are about angular momentum so I thought I'd post them together. I'm really confused on anything regarding rolling wheels and things like that (help me please!. It seems as though the whole chapter was amassed of all of the topics I cant wrap ...

*July 30, 2010*

**Physics**

Looks like we both have angular momentum problems. Im just as far along as you, I only have the formulas... Hopefully someone will know what to do!!!

*July 30, 2010*

**Chemistry**

thanks!

*July 15, 2010*

**Chemistry**

Using the activity series, explain the reason that most metals cannot exist in nature as elements but are found as compounds instead. Use specific examples to explain your answer. (Hint: Consider the reactivity of metals with water)

*July 15, 2010*