Friday

September 4, 2015
Total # Posts: 77

**physics**

a foot ball is thrown upward with an angle of 30 degree with respect to the horizantal .to throw a 40meter pass what must be the intial speed of the ball?
*October 17, 2014*

**social**

what do the migration routes of homo sapiens reveal about their survival skills and ability to adapt
*September 6, 2013*

**history**

In What ways did Neolitic People Dramatically improve their lives? Please check my answer.. the change over from hunting and gathering to farming and herding took place not once but many times. Neolithic people in many parts of the world independently developed agriculture
*September 6, 2013*

**history**

why do you think the development of agriculture ocurred around the same time in different parts
*September 6, 2013*

**history**

Please check my answer.. the change over from hunting and gathering to farming and herding took place not once but many times. Neolithic people in many parts of the world independently developed agriculture
*September 6, 2013*

**history**

in what ways did Neolithic people dramatically improve their lives
*September 6, 2013*

**social**

yes , all environment factors
*September 5, 2013*

**social**

what environmental factors may have influenced migration routes
*September 5, 2013*

**history**

what conclusions can you draw about humans from the information in early human migration 1,600-10,000 map
*September 5, 2013*

**social studies**

what kinds of problems did stone age peoples face
*September 5, 2013*

**history**

what conclusions can draw about early humans from the information presented in map
*September 5, 2013*

**history**

what environmental factors have influenced migration routes
*September 5, 2013*

**social, history**

what is the approximate distance homo traveled as they migrated from Ubeidiya ,Israel,to lantian,china
*September 5, 2013*

**social, history**

to what continents did homo sapiens migrate from asia
*September 5, 2013*

**math**

Calvin and Ken bought a bag of 60 onions. They divide all of these onions between them, such that the number of onions that Ken has is a multiple of the number of onions that Calvin has. Given that Calvin has at least 7 onions, what is the maximum number of onions that Ken has?
*July 25, 2013*

**math**

Sue is in an airplane which travels at a constant 300 kilometers per hour. The angle of climb of the airplane is 30 ∘. How long (in seconds) would it take from takeoff, before the airplane reaches 3000 meters, when Sue can access Wifi and work on the rest of the weekly ...
*July 25, 2013*

**physics**

A pair of fuzzy dice are hanging by a string in my car from the rear-view mirror. I hit the gas pedal, and while I accelerate the fuzzy dice no longer hang straight down, but instead make an angle θ of 15 degrees with respect to the vertical. How fast am I accelerating in...
*May 3, 2013*

**algebra**

If the expression (x2+2x−1)8 is completely expanded, what is the sum of the coefficients of the terms with even powers of x?
*April 29, 2013*

**math**

Three roots of f(x)=x4−2x3+ax2+bx+c are −5, −3 and 4. What is the value of a+b+c?
*April 29, 2013*

**math**

The roots of the polynomial f(x)=2x3+20x2+201x+2013 are α,β and γ. What is the value of −(α+1)(β+1)(γ+1)?
*April 29, 2013*

**math**

How many integers x satisfy the condition that both 2x and 3x are perfect squares?
*April 29, 2013*

**math**

Calvin was at his local grocery store, and saw that they had gummy worms for sale. To satisfy his foreseeable sugar craving, he bought 72 bags of gummy worms. Upon exiting the store, he noticed the the ink on the receipt was smudged, and he could see the price as $_3.4_. What ...
*April 29, 2013*

**math**

Calvin was at his local grocery store, and saw that they had gummy worms for sale. To satisfy his foreseeable sugar craving, he bought 72 bags of gummy worms. Upon exiting the store, he noticed the the ink on the receipt was smudged, and he could see the price as $_3.4_. What ...
*April 29, 2013*

**math**

Find the sum of all integers m that are less than 1000 and equal to n!+1−−−−−√ for some positive integer n.
*April 29, 2013*

**math**

If the ratio of x+y to x−y is 114, then the ratio of y to x can be written as ab where a and b are coprime positive integers. Find a+b.
*April 29, 2013*

**math**

How many pairs of integers (x,y) satisfy the conditions y=3x−1, 6x−2y=2 and 0≤x≤25?
*April 29, 2013*

**physics**

Consider a five-pointed star made of resistors as shown below. Each resistor has resistance R=6 Ω. Find the equivalent resistance in Ohms between the points A and B.
*April 27, 2013*

**physics**

Consider a five-pointed star made of resistors as shown below. Each resistor has resistance R=6 Ω. Find the equivalent resistance in Ohms between the points A and B.
*April 27, 2013*

**physics**

Climbing to the top of Mount Everest is hard. But, it's slightly easier than you might think as people weigh less as they climb to the top. Let WE be a person's weight on top of Mount Everest and WS be their weight at sea level. What is the value of 1−WE/WS?
*April 27, 2013*

**m**

x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13. What is the sum of all (distinct) possible values of x?
*April 24, 2013*

**math**

a,b and c are positive integers such that the simultaneous equations (a−2b)x=1, (b−2c)x=1 and x+25=c have a positive solution for x. What is the minimum value of a?
*April 24, 2013*

**math**

The four values x, y, x−y and x+y are all positive prime integers. What is the sum of all the four integers?
*April 24, 2013*

**math**

a and b are consecutive, positive integers such that a2−b2>22. What is the minimum possible value of a+b?
*April 24, 2013*

**math**

x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13. What is the sum of all (distinct) possible values of x?
*April 24, 2013*

**math**

What is the real part of (2+i)(6−i)?
*April 24, 2013*

**math**

The point (x,y) lies on both conics x2+xy+x=81 and y2+xy+y=51. Given that x+y is positive, determine the value of x+y.
*April 17, 2013*

**math**

The point (x,y) lies on both conics x2+xy+x=81 and y2+xy+y=51. Given that x+y is positive, determine the value of x+y.
*April 17, 2013*

**math**

Let A,B and C be matrices such that A=⎛⎝132213⎞⎠, B=(122423) and C=AB. What is the sum of all the elements (entries) of matrix C?
*April 16, 2013*

**math**

What is the sum of all of the positive divisors of 100?
*April 16, 2013*

**math**

The point (x,y) lies on both conics x2+xy+x=81 and y2+xy+y=51. Given that x+y is positive, determine the value of x+y.
*April 16, 2013*

**math**

How many ordered pairs of integers (x,y) are there such that 2x2−2xy+y2=225?
*April 16, 2013*

**math**

The function f(x)=x4−15x3+81x2−201x+182 has four complex roots, one of which is 3−2i. What is the sum of all real and imaginary coefficients of these roots?
*April 16, 2013*

**math**

Suppose z=a+bi, where a and b are integers and i is the imaginary unit. We are given that |1+iz|=|1−iz| and |z−(13+15i)|<17. Find the largest possible value of a+b.
*April 5, 2013*

**math**

Let f(x)=2x2+40x+25. Given that f(x) leaves the same remainder when divided by x−a as when divided by x+2a for a positive integer a, what is the value of a?
*April 5, 2013*

** math**

What is the largest possible integer that can be chosen as one of five distinct positive integers whose average is 10?
*April 5, 2013*

** math**

Find a positive integer N, such that when N is added to 98, it gives the same result as N multiplied to 98.
*April 5, 2013*

**math**

The three terms x+12, 3x+5 and 2x+25 are the first three terms of an arithmetic progression. What is the value of x?
*April 5, 2013*

**math**

n is a digit such that the 5-digit number n878n is divisible by 9. What is the value of n?
*April 5, 2013*

**math**

Able starts off counting at 13, and counts by 7. What is the 11th number that Able will say?
*April 5, 2013*

**physics**

The caber toss is a traditional Scottish sport that involves hurling a caber, which is essentially a large piece of a tree: a caber is a 6 m long, 80 kg tree trunk. Large strong people hurl these and the goal is to get the caber to land as far away as possible and rotate in ...
*March 29, 2013*

**physics**

Airplanes are noisy things. For example, if you stand really close to a runway, a military jet can produce a sound intensity of about 100 W/m2 at a distance of 30 m from the plane (this is beyond painful noise). You live near a military airport and want to work on physics with...
*March 29, 2013*

**math**

Let 3a be the highest power of 3 that divides 1000!. What is a?
*March 21, 2013*

**math**

x is a positive number such that x2+9x−22=0. What is the sum of all possible values of y which satisfy the equation x=y2−13y+24?
*March 21, 2013*

** math**

What is the imaginary part of −169−−−−√?
*March 21, 2013*

**science**

The sun goes around the center of our galaxy once every 250 million years. The sun is also 2.55×1020 m from the center of our galaxy. What is the acceleration of our sun towards the center of the galaxy in m/s2?
*March 18, 2013*

** scienc**

I'm driving my car of mass 1000 kg at 100 km/hr when I accidentally hit the rear end of a truck of mass 5000 kg traveling in the same direction at 90 km/hr. My car and the truck lock together and move as a single object. Let F1 be the force the truck exerts on my car and ...
*March 18, 2013*

**science**

Sally sells seashells by the seashore. In the morning, her sack of shells weighed 70 N. She sold seventy shells and in the evening her sack weighed 7 N. What was the average mass in kg of the shells she sold?
*March 18, 2013*

**physics**

The combination of the force of gravity and my hand provide a net force of 40 N on a ball straight up. The ball accelerates at 100 m/s2 while it is in my hand. What is the mass of the ball in kg?
*March 18, 2013*

**math**

What is the value of 232?
*March 15, 2013*

**math**

How many positive integers, a, are there such that 2027 divided by a leaves a remainder of 7?
*March 15, 2013*

**math**

What is the sum of all the possible values of a for which 25x2+(a−15)x+9 has exactly one distinct real root?
*March 15, 2013*

**algebra**

How many distinct prime factors does 100100 have?
*March 15, 2013*

**math**

The probability that it will take 5 or more flips of a fair coin before it lands on heads can be written as ab, where a and b are coprime positive integers. Find a+b.
*March 15, 2013*

**math**

The swimming pool that Calvin goes to has dimensions 20 meters long, 8 meters wide and 3 meters deep. What is the volume of water (in m3) that the swimming pool contains?
*March 13, 2013*

**math**

How many distinct prime factors does 100100 have?
*March 12, 2013*

**physics**

Gymnasts can do all sorts of ridiculous tricks on various equipment. In the rings event, the gymnast is supported by two rings attached by cords to the ceiling (see a picture here). If a gymnast weighs 75 kg and is motionless on the rings, what is the tension in each cord?
*March 10, 2013*

**math**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*March 8, 2013*

**5 th grade math**

The answer is D.
*January 10, 2013*

**Math**

She's right because you minus 7/7 - 5/7 =2/7
*October 15, 2012*

**English check please I've corrected it again**

Enigma
*September 14, 2011*

**Physics**

the heating element of a coffee maker operates at 120 V and carries a current of 2 A. Assuming that the water absorbs all of the energy converted by the resistor, calculate how long it takes to heat .500 kg of water from room temperature 23 degrees C to the boiling point.
*February 7, 2011*

**college physics**

If a is acceleration, v is velocity, x is position, and t is time, then check the validity (wrong or correct) of the following equations using dimensional analysis: a) t2 = 2x/a b) t = x/v c) a = v/x d) v = a/t ALSO , The term 1/2 PV^2 rv2 occurs in Bernoulli’s equation ...
*October 2, 2010*

**English**

Adamant
*August 30, 2010*

**8th grade Social Studies**

i hate skool!
*September 8, 2008*

**northland**

In "A White Heron," how does Sarah Jewett portray Sylvia's attitude about money? A. Sylvia hopes the hunter will give her some money no matter what she does. B. Sylvia struggles between protecting the heron and gaining the money. C. Sylvia doesn't really ...
*April 18, 2008*

**math**

r+1 is less than or equal to 0. What is r?
*October 18, 2007*

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