Tuesday
September 30, 2014

Posts by emily


Total # Posts: 2,314

Math
A 5 m stepladder propped against a classroom wall forms an angle of 30 degree with the wall. Exactly how far is the top of the ladder from the floor? Express your answer in radical form. What assumption did you make?
October 10, 2010

math
find a function y=ax^2+bx+c whose graph has an x-intercept of 1, a y-intercept of -2, and a tangent line with slope -1 at the y-intercept.
October 9, 2010

Math
Given any right triangle with an acute angle theta, a) Explain why csc theta is always greater than or equal to 1 b) Explain why cos theta is always less than or equal to 1
October 8, 2010

hist
who were the pilgrims and what did they believe?
October 8, 2010

algebra
A brick border that is x feet wide is built around a rectangular patio. The patio is 6 feet wide and 8 feet long. The combined area of the patio and the brick border is 120 square feet. What is the width of the brick border?
October 7, 2010

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

3rd grade
200
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

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

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