Friday
August 1, 2014

Posts by Emma


Total # Posts: 1,158

PreCalculus
How do you find the probability of three events happening at the same time? Please walk me through the steps. If you are in ship and get hit by lightning the probability is 1/100000. And the probability of falling down into the ocean and getting eaten by a shark is 100/100000....

PHYSICS
a wheel rotating at 1800 rpm slows down uniformly to 1200 rpm in 2.0 sec. calculate a)the angular acceleration (revs/s^2) of the motor. and b) the number of revolutions it makes in this time.

PHYSICS
a flywheel makes300.rpm. find the angular speed of any point on the wheel and the linear speed(tangential) of a point 5.00m from the center.

PreCalculus
Solve for x. sec(x)sin(x)=2sin(x) 0<=x<=2pi

geometry
A rectangle is 14cm wide and 48 cm long. Find the measures of the acute angle between its diagonals. please help

Algebra
Since it is asking for time, is C correct?

Algebra
A problem involving a ball being thrown in the air is modeled with a quadratic function. Which of the following would you be solving for if asked to find the time at which the ball will reach its maximum height? A. an x-intercept of the graph B. the y-intercept of the graph C....

Algebra
A. h=-16t^2+20t+300 B. h=-16t^2+20t+30 C. h=-16t^+20t+3 D. h=-16t^+200t+3

Algebra
Suppose you hit a fly ball with an initial upward velocity of 20 feet per second. Which of the following equations would be a realistic model for the height of the ball after t seconds?

Algebra
The height of a ball thrown directly up with a velocity of 40 feet per second from a initial height of of 5 feet is given by the equation h(t)=-16t^2+40t+5, where t is the time in seconds and h is the ball’s height, measured in feet. When will the ball hit the ground? Rou...

Algebra
Which of the following cannot be solved using the quadratic formula? A. x^2-x+3=0 B. x^2=9 C. 2x+3=0 D. -x^2=-x

Algebra
Which of the following cannot be solved using the quadratic formula? A.-3x^2-x+3=-3x^2 B. 0=x^2 C. 0=2x^2-1 D. x^2+3x-2=4x^2-5x-1 Is it C?

Algebra
But isn't it also true that you can't complete the square if there is no constant?

Algebra
Which of the following statements is true? A. Any quadratic equation can be solved by completing the square. B. Completing the square always gives two distinct solutions. C. You can’t complete the square if there is no constant in the equation. D. You can only use complet...

PHYSICS
two masses m1=400.g and m2 =600.g are connected with a light string which goes over a frictionless pulley of negligible mass. the two systems are released from rest. a) what is the acceleration of each mass? b) what is the tension force in the string? and c) what is the suppor...

Algebra
The length of a rectangle is 4 units more than its width. The area of the rectangle is 25 more than 4 times the width. What is the width of the rectangle?

Algebra
The length of a side of a rectangle is 2 units less than a number, and the width is 4 units more than the length. Which of the following expressions represents the area of the rectangle, in square units? A. x^2+2x+4 B. x^2-2x+8 C. x^2-4 D. x^2+4

RE: ALGEBRA
Given 25x^2 - 10x = 0, which values of x will satisfy the equation? (Hint: Factor the polynomial into two terms, and find the values of x that will make each term 0.) A. x = 0 and x = 5/2 B. x = 0 and x = 2/5 C. x = 0 and x = 2 D. x = 0 and x = 5

Algebra
Given 25^2-10x=0, which values of x will satisfy the equation? (Hint: Factor the polynomial into two terms, and find the values of x that will make each term 0.)

BABYSITTING
Which foods hinder the absorption of less absorbable forms of irons in foods, such as whole grains, dried peas or beans? A. Orange juice or other forms of Vitamin C B. Milk products or eggs C. Tea D. All of the above E. B and C PLZ HELP ME I THINK IT IS E.

PHYSICS
a ball is dropped from rest at 25m above the ground. how fast is it moving at 10 m above the ground and b) how much time does it take to reach the ground? no air resistance.

PHYSICS
V= pie r^2h r=4.38m V= 368m^3 h=?

PHYSICS
m1(x)=m2(3-x) (for x)

PHYSICS
m1v1+m2v2=m1vf+m2vf solve for (vf)

PHYSICS
a 100kg street light is supported equally by two ropes. one rope pulls up and to the right 40 degrees above the horizontal; the other pulls up and to the left 40 degrees . what is the tension of the rope?

PHYSICS
a 3000 N car is moving at 12.0m/s comes to a stop while skidding a distance of 25.0m. what is the coefficient of kinetic friction?

PHYSICS
a sled weighing 5.00 x 10to the third power can be accelerated from rest to 1.60 x 10 to the third km/hr in 2 seconds. muse of k =0.21. what force is required and how far did the sled go during acceleration?

PHYSICS
a mass of 2.00kg is pushed up a 50 degree incline. if muse of k is 0.400 and a force of 50.0 N is applied parallel to the plane, what is the acceleration of the mass?

PHYSICS
what is the kinetic energy of a 20.0g bullet moving with a speed of 150m/s? how much work is needed to stop the bullet?

PHYSICS
from a height of 1.5m a 2.0kg block slides down an incline which is 2.5m long and out onto the level floor. how far does it slide horizontally? muse of k is 0.32

PHYSICS
the speed of a bowling ball is 2.0m/s as it falls past a window of a tall building. using conservation of energy ,determine how fast it was going as it past another window 3.0m below.

PHYSICS
determine the speed of a 2.0g insect that has kinetic energy of 0.020 J.

physics
what would tension 1 be if W1=15N ,W2=20N and W3=150N, and Muse of k = 0.65?

Algebra
Which special case is represented by x^2-121? A. the difference of two squares B. the difference of cubes C. the square of a binomial D. the sum of cubes

PHYSICS
what would tension 1 be if W1=15N ,W2=20N and W3=150N, and Muse of k = 0.65?

Algebra
If you multiply a trinomial by a monomial, what type of polynomial will the product be? A. a monomial B. a binomial C. a trinomial D. it is not possible to determine

PHYSICS
a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the tension in the string?

Algebra
Give the degree and classify the polynomial by the number of terms. A. degree: 2; trinomial B. degree: 3; binomial C. degree: 3; trinomial D. degree: 2; binomial Is B correct?

Algebra
Combine like terms and classify the polynomial by the number of terms. 7x + 3x – x Is monomial correct?

PHYSICS
a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?

physic
a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the tension in the string?

Algebra
x: 0, 2, 4, 6 ,8 y: 1, 49, 2401, 117,649 How do the y-values in the table grow? A. The y-values increase by a factor of 49 for each x increase of 1. B. The y-values increase by 49 for each x increase of 1. C. The y-values increase by a factor of 7 for each x increase of 1. D. ...

Algebra
Find the polynomial form of the equation below. y=-1.0(x-4.0)^2+2.0

PHYSICS
a car is proceeding at a speed of 14.0m/s when it collides with a stationary car in front. during the collision the first car moves a distance of 0.300 m as it comes to a stop. the driver is wearing her seat belt, so she remains in her seat during the collision. if the drivers...

PHYSICS
a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the tension in the string?

PHYSICS
a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?

PHYSICS
a locomotive pulls 10 identical freight cars with an acceleration of 2m/s^2. How does the forced between the third and fourth cars compare to the force between the seventh and eighth cars?

Algebra
The vertex of a parabola is at (-2,4), and the x-intercepts are at -6 and 2. Determine the domain and range of the function. a. D: all real numbers R: all real numbers b. D: all real numbers R: y ≤ 4 c. D: -6 ≤ x ≤ 2 R: y ≤ 4 d. D: x ≤ 4 R: all re...

Algebra
All parabolas are symmetric with respect to a line called the axis of symmetry. A parabola intersects its axis of symmetry at what point? a. vertex b. function c. translation d. y-intercept Is it A. vertex?

Algebra
Which of the following is not a step in graphing a quadratic function? A. Find the equation for the axis of symmetry. B. Find the slope. C. Find the coordinates for the vertex. D. Plug in values for x around the vertex to get values of y Is B correct?

Algebra
The choices are: A.y=2x^2-12x+10 B. y=-1/2x^2+3x-11/2 C. y=x^2-6x+10 D. 2x^2-7x+4

Algebra
The vertex of the graph of a quadratic function is (3, 1) and the y-intercept is (0, 10). Which of the following is the equation of the function?

Algebra
Thanks! So I just want to make sure when I'm finding decay rate (in percent) do I just subtract 1-r?

Algebra
r=10.5(0.535)^x determine the decay rate

Algebra
What is the growth rate of the function y=3*2^x? Is the answer 1?

Algebra
Mary creates a table of values for a function and plots the points. She finds that the difference in the y values is the same. What kind of function did she graph? How can you tell if a graph is linear, quadratic, exponential or square root?

Algebra
Which is an equivalent form of the expression 1800(1.2)–t? Is 1800(1/2)^t correct?

Algebra
A population of ants is growing at a rate of 10% per month. What is the growth factor?

physics
a car is driven off the edge of that is 54.0 m high. the point of impact is 130m from the base of the cliff. how fast was the car traveling in (miles/hr) when it went over the cliff?

physics
with an initial speed of 260km/h a train takes 1.50 x 10^3 m to stop on a level track. assuming the 'deceleration' is constant. what is the time in seconds taken for stopping?

physics
what was the initial velocity of a race car traveling down a long straight track if it accelerates at 5.79m/s^2 and ends up going 163km/h in a time of 3.60 seconds?

Algebra
Which of the following statements is the best description of exponential decay? A. Exponential behavior occurs when a function increases at a rate of increasing value. B. Exponential behavior occurs when a function increases at a rate of decreasing value. C. Exponential behavi...

Algebra
Which of the following is an example of exponential growth or decay? A. a colony of bacteria staying constant in quantity each week B. a colony of bacteria doubling in quantity each week C. a colony of bacteria increasing by 100 in quantity each week D. a colony of bacteria de...

Algebra
divide and simplify the radical (3+ sqrt18)/4 sqrt12 I'm not sure how to conjugate the denominator?

Algebra
2√3 times 4√21 the answer is 24√7 but I don't understand how you would get that.

algebra
Simplify the square root of 50. A. 5 times the square root of 2 B. the square root of 5 times the square root of 10 C. 2 times the square root of 5 D. 25

Algebra
Find a recursive rule for the sequence 3, 6, 12, 24, … I can't decide if it's a sub n= (2)n times sub n-1 or a sub n= 1/2 times sub n-1

algebra
Solve the system of equations. 9x + y = 2 –4x – y = –17 I don't understand how you solve this.

Algebra
What is the solution to the system of equations that contains –3x + y = 3 and 2x – y = –1? A. no solution B. (–1, 3) C. infinite number of solutions D. (–2, –3)

Geometry
The radius of circle a (which is 6) is multiplied by 1/2. Describe the effect of the change of the area.

Goemetry
segment PQ with endpoints P(4,2) and Q(2,17) is dilated by a scale factor of 4. Find the length of segment P',Q'

geometry
Okay, thanks!

geometry
solve the proportion: 5/2=22/24w the answer is 11/30 but I don't understand how you get that.

Physics
Calculate the maximum acceleration of a car that is heading up a 9.5° slope, assume that only half the weight of the car is supported by the two drive wheels and that the static coefficient of friction is 1.

algebra
Sorry I didn't see that he answered. thank u

algebra
so the answer is no??

algebra
please help!!!!!!!!!!!

algebra
does the data in the table represent a linear function? if so, wirte a rule for the function. (below is what the table looks like) x | -2| -1| 0 | 1| 2| y | -7| 1| 8 | 17| 25| answer choices yes; y = 8x +9 yes; y = 8x + 8 no yes; y = 1/8x + 8

History Paper
Thanks! and yes, this is for my exam final.

History Paper
How have this event affected American society, with regards to the labor force, the economy, societal groups, housing, and overall lifestyles? Describe the attitudes and beliefs The US Government and Americans have towards war, as the U.S entered and exited the wars. How have ...

History Paper
What impact have the following conflicts had upon the US? (WWII, Korea, Vietnam, the Wars in Gulf, Iraq, and Afghanistan.) I have an outline of what I'm going to write but I just don't where to start, how to put it in words.

Statistics
Please answer yes or no to the following question for my statistics project: Are you in favor of welfare for those in need?

ap stats
two different sections of electricians took their state license test. the first section consisted of 75 applicants having an average score of 262 and a sample standard deviation of 35. they were journeyman, experienced electricians who were renewing their licenses. the second ...

ap stats
based on over 800 housing prices collected at random from the city of Los Angeles, an investigator constructed a histogram and found that the distribution of housing prices was heavily skewed to the right. Which of the following statistics will best represent the center of thi...

ap stats
Based on historical data, an Oregon university enrolls 17% graduates and 83% undergraduates. Of graduates, 21% are expected to be non-residents and 79% are residents. Of undergraduates, 24% are non-residents and 76% are residents. During the 2008-2009 academic year, assume tha...

environment
Oil spills and leaks in the Pacific Ocean have harmed marine organisms and the environment. Which kind of environmental issue is illustrated by this example?

Geometry
Please help me 1.The surface are of the exterior of hollow rubber ball is 16pi in^2.The rubber is 1/4 inch thick. Find the surface are of the interior of the ball. 2. The length of each side of a cube is 6 inches long. Find the exact area of a sphere inscribed in the cube.

Geometry
Which if the following is equivalent to 7pi/4? A.285 degrees B. 305 degrees C. 315 degrees D. 330 degrees E. 375 degrees

VOCABULARY
WRITE A BRIEF SPEECH IN WHICH YOU SUMMARIZE THE STORY OF RINGL AND PIT, USING IT AS AN INSPIRING ANECDOTE TO SHOW YOUR AUDIENCE THAT THEY TOO CAN OVERCOME DIFFICULT CIRCUMSTANCES . USE AT LEAST TWO DETAILS FROM THE PASSAGE AND THEREE UNIT WORDS TO SUPPORT YOUR POINTS ? YES I H...

ap statistics
Seventy-five (75) people with hypertension were given a new drug for the treatment of their condition. Blood pressure was lowered sufficiently to reduce the risk of serious outcomes in 20 of the 75 patients. 
(B) Calculate a 95% confidence interval for the proportion. Sh...

math
OH OK THANK YOU

math
2x+8=3x+2 Can you please help me solve this one problem please

English Essay
I'm writing an essay for To Kill A Mockingbird and the claim I came up for my essay is "Children are never too young to understand the realities of life." I'm writing the extended paragraph right now where I have to come up with a good example from the story ...

ap statistics
What would the null and alternate hypothesis be? A fire insurance company felt that the mean distance from a home to the nearest fire department in a suburb of Chicago was at least 4.7 miles. It set its fire insurance rates accordingly. Members of the community set out to show...

ap statistics
What would the null and alternate hypothesis be for this problem? The manager at Air Cargo feels that the weights of packages shipped recently are less than in the past. Records show that in the past packages have had a mean weight of 36.7 lb. and a variance of 201.64 lb2. A r...

math
OH OK THANK YOU STEVE

math
F(x)=x^2-2x-3 plz help me slove this ?

letter
mm yes i guess it good dylan but try harder

ap statistics
What is the mean of the sample means? What is the standard deviation of the sample means?

GOVERNMENT
OK thank you

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