
Maths
There are 50 students in a class of which 40 are boys and the rest are girls the average weight of the class is 44kg and the averageweight of the girls us 40kg. find the average wieght of the boys
asked by priya on March 15, 2015 
statistics
According to a college survey, 22% of all students work full time. Find the mean and standard deviation for the number of students who work full time in samples of size 16.
asked by Hannah on March 16, 2015 
Calc
A spherical snowball is placed in the sun. The snowball melts so that it's surface area decreases at a rate of 2 cm2 /min. Find the rate at which the diameter decreases when the diameter is 8 cm.
asked by Jocelyn on October 24, 2014 
math
A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours. f(t) = 1
asked by liz on October 9, 2010 
Math/geometry
Two angles are complementary.the second angle has 6 more than three times the measure of degrees as the first one. Find the measure of each angle using an equation. Define your variables. I didn't get what the two variables should be... And how I'd write
asked by Sonja R on April 12, 2016 
STATISTICS
A study has shown that among people without any preschool education, 32% were employed at age 19. If 100 people without preschool education are selected, find the probability that 40 or fewer are employed.
asked by Sonny on October 28, 2009 
Probability
From a box containing 7 blue, 5 red, 3 green, and 9 yellow marbles, 2 are drawn one at a time without replacing the first marble before the second marble is drawn. Find the probability that one is blue and one is yellow.
asked by Amanda on May 2, 2012 
mathematics
the lenght of a rectangle is twice its width.If the width is reduced by 1cm and the lenght is also reduced by 2cm,the area will be 15cm(square).Find the dimensions of the original rectangle.
asked by john on October 26, 2014 
Maths
A sheet of paper measuring 30cm by 20cm . A strip of Wide 4cm cut from it all around. Find the área of the remaining sheet and also the área of the cut strip
asked by Anonymous on December 1, 2017 
math, geometry
The bases of trapezoid ABCD are \overline{AB} and \overline{CD}. Let P be the intersection of diagonals \overline{AC} and \overline{BD}. If the areas of triangles ABP and CDP are 8 and 18, respectively, then find the area of trapezoid ABCD.
asked by Anonymous on April 27, 2014 
math
a 6 foot red casts a shadow that is 7 feet long. the shadow of a nearby tree is 42 feet long. slove a proportion to find the height of the tree
asked by andy on January 18, 2017 
Math Problem (please help)
A rectangular classroom seats 252 students. If the seats were rearranged with three more seats in each row, the classroom would have two fewer rows. Find the original number of seats in each row.
asked by Ada on September 26, 2014 
Math
Tonia deposited a total of $174.52 into her checking account. She also withdrew a total of $186.15. Use addition to find the net change in Tonia’s checking account.
asked by Caitlin on September 25, 2011 
College Algebra
The equation for the total revenue earned by a company for selling widgets is p=4q. The equation for the total cost of the company for producing widgets if p=q+6. Find the breakeven quantity.
asked by Sarah on November 21, 2013 
Math
The bearing of point Y from a point X is 048°. If Y is 115km away from point X and the bearing of point Z from Y is 120° at a distance of 75km. Find the distance between X and Z, using a scale of 1cm to represent 20km
asked by Bau on June 18, 2018 
algebra
A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. find the speed of the tugboat without a current and the speed of the current
asked by maggie on August 9, 2012 
calculus
Find all points on the curve x^2y^2+xy=2 where the slope of tangent line is 1. This is what I got. x^2y^2+xy=2 x^2*2ydy/dx + 2x*y^2 + x*dy/dx + y =0 dy/dx(2yx^2+x)= 2xy^2y dy/dx = (2xy^2y)/(x+2yx^2) how do I finish from here? I need to know where the
asked by Riley on April 2, 2009 
Math
1) A dilation maps triangle HIJ onto triangle H'I'J. If HI= 7 cm, IJ= 7 cm, I’J’= 5.25 cm, and H’J= 9 cm, the find HJ. a. 4.08 cm^^^ b. 6.75 cm c. 9 cm d. 12 cm 2) if A' is the image of a(3, 4) after a dilation with scale factor 7 centered at the
asked by Valhalla on September 24, 2018 
English
I have to find all the nouns and label them. Exploration is dangerous. It takes courage to sail to an unknown land. Exploration  idea Courage  idea Land  place
asked by Aveary on August 26, 2015 
Statistics
A car rental agency currently has 41 cars available, 28 of which have a GPS navigation system. Two cars are selected at random from these 41 cars. Find the probability that both of these cars have GPS navigation systems
asked by Anonymous on March 22, 2013 
english
Hi I have to write a paper on 2 opposing sides of tattoos. but everytime I show my teacher 2 sides I think of she keeps saying the paper is still one sided. Can someone please help me find 2 truly opposing arguements when it comes to tattoos thanks sooooo
asked by jenny on December 12, 2008 
chemistry
Lithium iodide has a lattice energy of 7.3x10^2kj.mol and heat of hydration of 793kj.mol. Find the heat of solution for lithium iodide.
asked by Cassie on September 22, 2011 
MATH_URGENT
The bases of trapezoid ABCD are \overline{AB} and \overline{CD}. Let P be the intersection of diagonals \overline{AC} and \overline{BD}. If the areas of triangles ABP and CDP are 8 and 18, respectively, then find the area of trapezoid ABCD.
asked by RhUaNg on April 27, 2014 
GEOMETRY HELPPPPP MEEEE PLEASSEEEEE!!!
Find the lengths of the diagonals of this trapezoid. trapezoid on a graph with points (a,0), (b,c), (b,c), (a,0) negative a and b are on the left side (a is on bottom and b is on top) and positive a and b are on the right side (a is on bottom and b is on
asked by Anonymous on December 23, 2012 
math
A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours.
asked by liz on October 7, 2010 
Maths
A shopkeeper has false balance. It weighs 10% profit when buying goods and weighs 10% loss when selling goods. Find the profit and loss percent by weighing?
asked by Rabin on August 27, 2016 
Law of Sines
In Triangle ABC, a=15cm, c=9cm, and angle C= 35 degrees. Find b and angle b. (Recall sin theta= sin (180 degreestheta). I'm not sure how to approach this.
asked by Richard on September 6, 2014 
physics
Two objects (52.0 and 20.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.
asked by brando on July 1, 2013 
math
87122178=6543 65434356=2178 Can you find another set of numbers with the same pattern? Now add the results you got. ..and a similar pattern by subtracting the results.
asked by Jared on June 12, 2007 
physics
An 85kg jogger is heading due east at a speed of 2.0 m/s. A 55kg jogger is heading 22° north of east at a speed of 2.7 m/s. Find the magnitude and direction of the sum of momenta of the two joggers.
asked by Anonymous on January 12, 2015 
math
justify that15 is the sum of eachrow of a 3X3 magic square using the number 09. Find the sume of all the numbers. What is the of eachrow in a 4X4 magic square that uses the numbers 116.
asked by Mark on April 22, 2010 
geometry
A segment 12" long is divided into two segments having lengths in the ratio of 2:3. Find the length of each segment. (Hint: Let 2x and 3x represent the length of the parts.) x = ? segment 1 = (2x) = ? inches segment 2 = (3x) = ? inches
asked by terri on March 9, 2011 
Algebra II
The future value of $6000 invested for 5 years at rate r, compounded annually, is given by S=6000(1+r)^5. Find the rate r, as a percent that gives a future value of $8415.31. Round to the nearest whole percent.
asked by Shay on July 7, 2011 
math
Lareina understands factors, but sometimes she has trouble finding all the factors of a number. What advice would you give to help her find all the factors of a number? Demonstrate by finding all the factors of 110. I NEED HELPPPP!!!!!!!!!!!!!!!!!!!!!!!!!!
asked by Gabby ( 5 grade) on January 31, 2012 
science
a sphere A of mass 3.0kg moving at 8.0m/s collides with another sphere B of mass 5.0kg moving in opposite direction to A at 4.0m/s.find the velocities of the spheres immadiately after the impact if e=0.30
asked by yusuph on August 11, 2018 
math
"Mahpee was selling magazine subscriptions. He earned $5 plus $0.50 for each subscription he sold. If Mahpee earned $25, use the equation 25=5 + 0.50n to find the number of subscriptions n he sold." How do I figure this out??
asked by Rinoa on September 21, 2010 
maths need help word problem
A number is made up of two digits whose sum is 9. If this number is now divided into the number made up of the same digits but in reverse order the result is sixfifths. Find the number? Step plz
asked by help on November 15, 2016 
physics
Two objects (53.0 and 16.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.
asked by chidera on September 23, 2014 
math
Mercy must obtain an average mark of at least 85 to get an A grade in her mathematics examination,out of the four examinations she obtained 80,85 and 82 in the first three. Find the mark she must obtain on the fourth examination of to enable her get an A
asked by Glory on June 11, 2016 
geometry
Find the number of degrees in the measure of one of the base angles of an isosceles triangle, if the measure of the vertex angle is 36 degrees less than the sum of the measures of the base angles.
asked by lorie on January 14, 2011 
algebra
Find the number of degrees in the measure of one of the base angles of an isosceles triangle, if the measure of the vertex angle is 36 degrees less than the sum of the measures of the base angles.
asked by mw on January 14, 2011 
Math
A certain triangle has a perimeter of 3080 mi. The shortest side measures 71 mi less than the middle side, and the longest side measures 373 mi more than the middle side. Find the lengths of the three sides.
asked by Jess on September 6, 2018 
Calculus
As an ice cube melts its surface area in decreasing at a rate of 6 cm^2 / sec. Find the rate at which the length of each side is decreasing at the moment when each side has length 2 cm.
asked by Daniel on December 11, 2015 
Physics
A light Ray is incident at an angle of 45 degrees on one side of a glass plate of index of refraction 1.6. Find the angle at which the ray emerges from the other side of the plate
asked by Gela on August 4, 2015 
math
Ms. Handler walks to work at an average speed of 5 kilometers per hour. If she increases her speed to 6 kilometers per hour, she will save 10 minutes. Find the distance she walks.
asked by Rob on October 12, 2015 
Geometry
Segment AD is perpendicular to the radius of circle (B) and the radius of circle (c). If radius BA=6in, segment AD=21in and radius CD=16in, find the length of BC to the nearest tenth of an inch.
asked by Ben on May 10, 2016 
math
(a) Use a graph of f(x) = sqrt(2x^2+9x+5)−sqrt(2x^2+2x+1) to estimate the value of lim x→∞ f(x) to one decimal place. (b)Use a table of values of f(x) to estimate the limit to four decimal places. (c)Find the exact value of the limit.
asked by Kayla on February 11, 2015 
social studies
How did the slave trade affect the eastern shore? Also where can I find information about the Slave Trade on Maryland's Eastern shore on its economics and culture? Help is Appreciated! Thankyou
asked by Johnny on November 6, 2008 
Algebra II
The future value of $6000 invested for 5 years at rate r, compounded annually, is given by S=6000(1+r)^5. Find the rate r, as a percent that gives a future value of $8415.31. Round to the nearest whole percent.
asked by Shay on July 7, 2011 
Chemistry
With the mass percent of Fe, oxalate ion, and water; find the mass percent of potassium ion in the complex iron salt difference. Fe= 11.37% H2O= 12.24% oxalate= 28.01%
asked by Anonymous on November 13, 2012 
math
there are 7 identical spheres each colored on the inside with one color in more than 4 of them. When 2 spheres of the same color touch each other they both glow in color. Using as few comparisons as possible, find a single spehere that has the majority
asked by juliann on March 11, 2012 
physics
Two objects (41.0 and 20.8 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find the acceleration of the objects and the tension in the string.
asked by Anonymous on October 7, 2011 
math
The radius of circle is given as 2.8 cm to 2 significant figure (a) If C is the circumference of the circle, determine the limits between which C/π lies. (b) By taking π be 3.14; find to 4 significant figures the line between which the circumference lies
asked by John on February 9, 2015 
Writing
Where Can i find some short current event articles? http://www.nytimes.com http://www.latimes.com http://www.pe.com http://www.time.com That is, just about any newspaper or newsmagazine. =)
asked by Bryan on February 26, 2007 
Math
A rectangle is 40 meters longer than its width if its length were increased by 10 meters and its width would be decreased by 5 meters its area would be increased by 190 square meters. Find the dimensions
asked by Jeska on October 13, 2016 
calculus
A spherical snowball is placed in the sun. The snowball melts so that it's surface area decreases at a rate of 2 cm2 /min. Find the rate at which the diameter decreases when the diameter is 8 cm
asked by Jocelyn on October 24, 2014 
Math
A multiple  choice quiz contains 5 questions with 4 choices for each answer. A student passes the quiz if they get at least an 80% on the quiz . If a student guesses on every question , find the probability that she passes the quiz . I have tried
asked by Kaela on February 28, 2015 
Mathhelpppppp
1)when a certain polynomial is divided by x  3, the quotient is x^2+2x5 and the remainder is 3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29xx^340)/(3+x) b)(6+7x11x^22x^3)/(x+9)
asked by sarah on April 28, 2012 
biology
Im carrying out an investigation on respiration, comparing the different rates in maggot tissue and mung beans. i was wondering if you could help me to find out why maggot tissue and mung beans are efficent to use?
asked by Kat on June 18, 2008 
physics
write down the uncertainty in the volume of the cylinder (3.36*10^2) write down the minimum uncertainty with which the volume of the cylinder can be determined (1.79*10^2) it says to compare these values and discuss briefly. I figured out how to find
asked by Anna on February 15, 2009 
physics
a rock is thrown vertically down from a bridge with an initial velocity of 30m/s and strikes the water in 2.0sec. find the velocity with which the rock strikes and the height of the bridge.
asked by roger on June 20, 2014 
trig
If sin theta = x and pi/2 is less than or equal to theta less than or equal to pi/2, find sin 2theta and cos 2theta in terms of x. Is it alright if I recommend you to my classmates tommorow? YOu seem to know more than my professor!
asked by Priya on May 1, 2008 
algebra
a tugboat goes 160 miles upstream in 20 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current.
asked by ashley on August 19, 2012 
Math 142 (PreCal) (Circles)
A wheel spins through 29 revolutions per minute. Find the angular velocity and the linear velocity if the radius of the wheel is 1.8 feet. w=? (rad/min) v=? (feet/min)
asked by Ray on March 31, 2016 
algebra
Use the discriminant to find out whether this quadratic polynomial can be factored. Factor the polynomial if it is not prime. This polnomial is prime, so I cannot factor it. I just need help with the discriminant part. Thaks in advance for your help.
asked by Trina on September 3, 2010 
Precalculus
The graph of the parametric equations x=cos(t), y=sin(t) meets the graph of the parametric equations x=2+4cos(s), y=3+4sin(s), at two points. Find the slope of the line between these two points.
asked by Phil on April 9, 2016 
physics
A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting 2.3 m/s what am i doing wrong?
asked by courtney on March 7, 2008 
chemistry
There are exactly 60 seconds in a minute, there are exactly 60 minutes in an hour, there are exactly 24 hours in a mean solar day, and there are 365.24 solar days in a solar year. Find the number of seconds in a solar year.
asked by Mely on September 3, 2010 
stats
2. The average age of a child in kindergarten is 66 months. The standard deviation is 4 months. If a random child is selected, find the probability that the mean age is: a) Between 64 and 68 months b) Greater than 62 months
asked by AMbe on August 4, 2012 
Algebra is my answer right
The function g is defined by g(x)=3x^2+6. Find g(5y) Algebra  drwls, Friday, February 4, 2011 at 11:07am 3*(5y)^2 + 6 = __? Algebra  Janet, Friday, February 4, 2011 at 3:56pm I get 75y+6
asked by Janet on February 4, 2011 
maths
if a hollow sphere of internal and external diameter 4cm melted 8cm respectively melted into a cone of base diameter 8cm . find the height of cone
asked by priya on March 8, 2016 
Mathhelp help help
1)when a certain polynomial is divided by x  3, the quotient is x^2+2x5 and the remainder is 3. what is the polynomial 2) Find each quotient and remainder. Assume the divisor is not equal to zero. a)(2x^2+29xx^340)/(3+x) b)(6+7x11x^22x^3)/(x+9)
asked by sarah on April 28, 2012 
algebra
Diagonal brace. The width of a rectangular gate is 2 meters (m) larger than its height. The diagonal brace measures square root of 6. Find the width and height.
asked by Simone on August 24, 2010 
mathematics
the area of a rectangle is 175 and the length is 1 and a half times bigger than the width. find the width L x W = Area L = 1.5W 1.5W x W = 175 or 1.5W^2 = 175 W^2 = =116.666 making W = 10.80... and L = 16.20... 10.80... x 16.20... = 175
asked by ayinde on September 12, 2006 
physics
Silicon is doped an acceptor of 10^18/cm^3. Find the electron and hole concentration, the electron and hole mobilities, and the resistivity of this silicon material at 300 K. Is this ntype or ptype?
asked by Alex on April 10, 2011 
Language Arts
Quick question. Is Two Kinds by Amy Tan, fiction or nonfiction? This is not a question on a quiz or a quick check. I cannot find any sources online that tell me whether or not it is fiction or nonfiction.
asked by ILTHSM_ on October 1, 2018 
math
Christie pilots her plane for 360 mi against a headwind in 33 hrs. The flight would take 22 hrs and 15 mins with a tailwind of the same speed. Find the headwind and the speed of the plane in still air.
asked by JULIA on October 16, 2016 
Physics
Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Find the electric field on the x axis at x = 6 cm. (b) At what point on the x axis is the electric field zero?
asked by Alyssa on January 29, 2016 
precalculus
The question is...find the radian measure of the central angle of a circle of radius r that intercepts an arc of length s. Then it gives the radius r of 27 inches and an arc length s of 6 inches. How do I do that?
asked by Megan on February 28, 2010 
mathstatistics
If the probability of an authentic laying goose is 0.83, find the probability of getting a laying goose on or before the fourht trial. I think that answer is: (0.17)(0.17)(0.17)(0.83)=.00407 *the answer needs to be rounded to three significant digits*
asked by Sherri on December 14, 2008 
Statistics
If there are 6 red disks numbered 1 through 6, and 4 yellow disks numbered 7 through 10, find the probability of selecting a yellow disk given that the number selected is less than or equal to 4 or greater than or equal to 8.
asked by SHEYLAMIEL on October 16, 2016 
Math
The sum of John's age and twice of his son's age is 56. In 8 years time, the son's age will be half of john's age. Find there present ages. Right now I wrote down an equation x+2y=56 and not quite sure what to do next.
asked by Jonathan on October 31, 2009 
chemistry
CH_4 (g) + H_2O (g) > CO (g) + 3H_2 (g) How many moles of water vapor react to yield 144.84 moles of hydrogen? I am confused on how exactly how to find this yield of water vapor
asked by alex on April 3, 2019 
MAT 116
A tugboat goes 180 miles upstream in 10 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current.
asked by Samantha on November 11, 2012 
physics
Two objects (39.0 and 21.0 kg) are connected by a massless string that passes over a massless, frictionless pulley. The pulley hangs from the ceiling. Find (a) the acceleration of the objects and (b) the tension in the string.
asked by Sally on October 3, 2012 
Stiochiometry
15.8 grams of NH3 and excess O2 produces NO gas and H2O. 12.8 grams of NO gas was produced. Find the percent yield. Balanced Equation: 4 NH3 + 5 O2 > 4 NO + 6 H2O
asked by Mikey on May 15, 2011 
Pre Calculus
Let $\bold{w} = \begin{pmatrix} 2 \\ 1 \end{pmatrix}$. There exists a $2 \times 2$ matrix $\bold{P}$ such that \[\text{proj}_{\bold{w}} \bold{v} = \bold{P} \bold{v}\] for all 2dimensional vectors $\bold{v}$. Find $\bold{P}$.
asked by Bob on September 20, 2017 
Statistics
Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone. explain how answer was arrived
asked by Mitch on February 24, 2011 
Math
Your school's football team scored 49 points. Your team's scored 19 points more than the opponent's scores. Write and solve an equation to find the opponent's score
asked by Izamae on September 12, 2016 
English
is "six inches of snow are predicted, I'd better find my boots" a run on, simple or compound sentence. I am pretty sure its not a compound because there is no coordinate conjunction but i am not sure if it is a simple or run on sentence
asked by Pencer on April 9, 2019 
cocoa
Julian's shadow is 6 feet long. At the same time a 31 foot tall building casts a shadow that is 28 feet long. What proportion could be used to find Julian's height?
asked by Anonymous on May 14, 2012 
math
the distance between two stations is 300km. two trains start simultaneously from these stations and move towards each other ,the speed of one them is 7k/hr more than the other . if the distance between them after 2hours of their start is 34km ,find the
asked by TUHITUHI on October 7, 2012 
chemistry
There are exactly 60 seconds in a minute, there are exactly 60 minutes in an hour, there are exactly 24 hours in a mean solar day, and there are 365.24 solar days in a solar year. Find the number of seconds in a solar year.
asked by Mely on September 4, 2010 
Z table
Suppose that the readings on the thermometers are normally distributed with a mean of 0∘ and a standard deviation of 1.00∘C. If 8% of the thermometers are rejected because they have readings that are too high, but all other thermometers are acceptable,
asked by Anonymous on September 25, 2015 
ChemistrypH
Question: v cm3 of a 0.2 M HX solution and v cm3 of 0.1 M KOH solution is mixed.pH of the final solution is 5.3 1)Find ka of HX 2)Find the moles of NaOH and HCl should be added respectively,for the pH of 1dm3 of the solution to increase and decrease by 1
asked by Shenaya on May 31, 2017 
English
We are doing this group project where we have to teach the class our vocab words. My job for the project is to make big flashcards with pictures of the words on it. One of the words is vignette, and I have no idea what picture to use, the definition is
asked by Emily on February 10, 2010 
Physics
Two large, parallel, conducting plates are 20 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 3.0 1015 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) a)
asked by Lex on April 27, 2013 
Math
A very strong girl runs 200 miles east for several hours. After a brief rest she runs another 100 miles north. She stops for the night at a local bed and breakfast and the next morning walks 75 miles directly southeast. Find the magnitude and direction of
asked by Kevin on November 23, 2010 
Chemistry
Draw Lewis dot structures, including appropriate resonance forms, and assign formal charges to each of those structures, for the molecule urea, with chemical formula NH2CONH2. You should find at least 3 such structures, some of which will have formal
asked by Emma on October 25, 2009 
physics
a boy stands on a cliff overlooking a lake below. He throws a rock at an initial velocity of 8.0m/s,at an angle 25 degrees above the horizontal. The lake's surface is 4.5 m lower than the point the rock was released. Find the speed of the rock just before
asked by bec on November 7, 2011
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