
physics
An archer pulls a bowstring back 0.390 m, and the spring constant of the bow is 675 N/m. a.) Find the amount of work the archer did to draw the bow. b.) Find the speed an arrow of mass 0.075 kg will have when it is shot from the bow. Assume no losses from
asked by archie on February 20, 2018 
Math
Let A(2,3) be a fixed point. A point P moves such that PA is equal to the distance of P from the yaxis. Find the equation of the locus of P PA2 = (xx1)2 + (yy1)2 +??? = (x2)2 + (y3)2 +??? I tried solving it using the distance formula but I'm still
asked by Nye on September 6, 2016 
Math
Let A(2,3) be a fixed point. A point P moves such that PA is equal to the distance of P from the yaxis. Find the equation of the locus of P PA2 = (xx1)^2 + (yy1)^2 +??? = (x2)^2 + (y3)^2 +??? I tried solving it using the distance formula but I'm still
asked by Nye on September 6, 2016 
chemistry
How much energy is evolved when 2.65 mg of Cl(g) atoms adds electrons to give Cl1(g) ions. No clue how to go about solving this problem as it doesn't really relate to any of my examples in my text book or notes. All I can find that related to this problem
asked by Spider on April 3, 2010 
Calculus
Two particles move along the x axis. For 0 is less than or equal to t is less than or equal to 6, the position of particle P at time t is given by p(t)=2cos((pi/4)t), while the position of particle R at time t is given by r(t)=t^3 6t^2 +9t+3. 1. For 0 is
asked by Madeline on December 19, 2012 
Calculus
Two particles move along the x axis. For 0 is less than or equal to t is less than or equal to 6, the position of particle P at time t is given by p(t)=2cos((pi/4)t), while the position of particle R at time t is given by r(t)=t^3 6t^2 +9t+3. 1. For 0 is
asked by Madeline on December 19, 2012 
Calculus
A manufacturer determines that the profit derived from selling x units of a certain item is given by: P = − 2x^2 +800x Find the marginal profit for a production of 20 units. Also, The demand function for a particular commodity is given by: p = 400− 4x
asked by John on August 23, 2011 
Calculus
For f(x)=2(x+5)^3 +7 Find and classify the extreme values, determine where the function is increasing and decreasing, where it is concave up and concave down, and any points of inflection. I understand this is using the first and second derivative tests,
asked by Natalie on July 22, 2014 
math
The position vectors of points A and B with respect to the origin 0, are (8,5) and (12,5) respectively. Point M is the midpoint of B and N is the midpoint of OA. (a) Find: (i) The coordinates of N and M (ii) The magnitude of NM (b) Express vector NM in
asked by Kg on October 7, 2013 
Differential Equations
Find the charge on the capacitor in an LRC series at t = 0.02 sec when L = 0.05 h, R = 2 Ohm, C = 0.01 farad. The initial conditions are q(0) = 5 C, i(0) = 0 Ampere. Determine the firt time at which the charge on the capacitor is equal to zero. Also, find
asked by Chuck on April 22, 2012 
algebra HELP PLEASE
Selling shirts. If a vendor charges p dollars each for rugby shirts, then he expects to sell 2000 100p shirts at a tournament a) Find a polynomial R(p) that represents the total revenue when the shirts are p dollars each. b) Find R(5), R(10), and R(20).
asked by bobbi on July 25, 2010 
math
1000 tickets for prizes are sold for $2 each. Seven prizes will be awarded – one for $400, one for $200, and five for $50. Steven purchases one of the tickets. a) Find the expected value b) Find the fair price of the ticket. The expected value= 950/2000
asked by Mario on March 25, 2007 
Physics
A shell is fired from the ground with an initial speed of 1.72 103 m/s at an initial angle of 40° to the horizontal. a) Neglecting air resistance find the horizontal range b) Find the amount of time the shell is in motion
asked by Jacob on November 14, 2012 
Math stuff
Can someone please help me with something? Find the surface area of the prism. 5 m, 12m, 9m. its rectangular Also, Find the surface area of the cylinder to the nearest tenth of a square unit, 4cm, 12.4 cm. I dont quite understand this unit, im bad a
asked by Booper on April 4, 2018 
Physics
Use the relationship power = current voltage to find out how much current is drawn by a 1350 watt hair dryer when it operates on 120 volts. Then use Ohm's law to find the resistance of the hair dryer.
asked by John on February 21, 2011 
Ap calc.. Dying!! Please help!
Given the curve x^2xy+y^2=9 A) write a general expression for the slope of the curve. B) find the coordinates of the points on the curve where the tangents are vertical C) at the point (0,3) find the rate of change in the slope of the curve with respect
asked by Aparna on January 25, 2013 
Math Calc 1
1. At what point does the normal line to the curve x^2  XY + Y^2 = 3 at the point (1,1) intersect the curve again? 2. Find the constants A, B so that if Y=A*sin X + B cos X, then Y satisfies the differential equation Y" + 2Y = 0. 3. Find the points on he
asked by Lynn on February 25, 2015 
History
I'm doing a project for the Republic of Congo (Not the Democratic) and I have to find a holiday celebrated there and explain and name one food eaten on that holiday I chose National Youth Day but I cant find a specific food they eat on that day. Can anyone
asked by Anonymous on October 30, 2016 
physics
An electron passes location h0.02m, 0.04m,−0.06mi, and 4 μs later is de tected at location h0.02 m, 1.84 m,−0.86 mi. Find the average velocity of the elecron: ¯v = If the electron continues to travel at this av erage velocity, find where it will be
asked by NADIA on January 19, 2014 
math
In developing a multiple linear regression model in excel. How do I find the x and Y inputs. How do I find a 95% confidence interval for the mean market value for houses that are 30 years old and have 1,800 sq ft, and 95% prediction interval for a house
asked by Rachael on August 25, 2013 
Calc
1. At what point does the normal line to the curve x^2  XY + Y^2 = 3 at the point (1,1) intersect the curve again? 2. Find the constants A, B so that if Y=A*sin X + B cos X, then Y satisfies the differential equation Y" + 2Y = 0. 3. Find the points on he
asked by Anonymous on February 25, 2015 
math
The position vectors of points A and B with respect to the origin 0, are (8,5) and (12,5) respectively. Point M is the midpoint of B and N is the midpoint of OA. (a) Find: (i) The coordinates of N and M (ii) The magnitude of NM (b) Express vector NM in
asked by kg on October 7, 2013 
physics
a bus having mass of 3000kg is moving at 30m/sec.find the momentum of the bus. 1)at the starting point from rest. 2)at the final state while motion at 30m/sec. 3)find the difference of moment in above (1) and (2)
asked by sweetie on November 24, 2010 
Algebra
A certain region is losing 24 million acres of rain forest each year? find a linear function f that calculates the change in acres of rain forest in millions in x years. then find f(4) and interpret the result
asked by Tia on August 5, 2012 
physics
A body moves in a straight line with initial velocity and uniform acceleration. Find how far it travels in 12s, giving that it travels 246m in the first 6seconds and 69m in the last 3seconds. Find also the initial velocity.
asked by skenge on February 15, 2013 
History
I am trying to find indepth information on the antifederalists argument for states' rights. I know that it involved the states' rights concerning political, economic and military control. I can only find information that is way over my head. I am in the
asked by Sara on June 7, 2009 
Chemistry
I need to find the tested and published pH values of the following solutions: (1) 1.0 M NaCl (2) 1.0 M sodium acetate (3) 1.0 M sodium sulfate (4) 1.0 M Sodium Bisulfate (5) 1.0 M Sodium Carbonate (6) 1.0 M Ammonium Chloride\ Is there a reliable MSDS
asked by Really Need Help on March 6, 2012 
Math
Find an equation for the tangent line to the curve at (π/2 , 2). y = 4 + cot(x)  2csc(x) I am confused how to take the derivative of this problem. When I tried to solve it I ended up with csc^2 (x) + (2csc(x) * cot(x)). From there I can't seem to
asked by Dave on October 11, 2016 
Trigonometry
A freighter, streaming on course 140„a at 20 knots, is 40 nautical miles N20„aE of a submarine with a cruising speed of 25 knots. Find the course to be set by the sub to overtake the freighter in the least amount of time, and find this minimum time.
asked by Anonymous on January 15, 2012 
calculus
Let f be the function defined by f(x)= sqrt(x), 0
asked by lisa on October 8, 2012 
physics
Find the force acting on a 12,500 kg F4 Phantom jet in the following situations (you will need to find the acceleration first) : 1. It is catapulted from rest to 250 km/hr in 2.2 seconds. Acceleration: (250/2.2) / 2.2 = 51.6 F = 12,500 * 51.6 = 645 645N Is
asked by catlover on May 11, 2018 
Math Calc 1
1. At what point does the normal line to the curve x^2  XY + Y^2 = 3 at the point (1,1) intersect the curve again? 2. Find the constants A, B so that if Y = Asin X = B cos X, then Y satisfies the differential equation Y" + 2Y = 0. 3. Find the points om he
asked by Lynn on February 24, 2015 
physics
A 3.60 kg object is attached to a vertical rod by two strings as in the figure below. The object rotates in a horizontal circle at constant speed 7.15 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower string. N
asked by jones on October 18, 2011 
algebra
A certain region is losing about 12 million acres of rain forest each year. A. Find a linear function f that calculates the change in acres of rain forest in millions in x years. B. Find f(8) and interpret the results
asked by Rhonda on April 10, 2013 
calculus
Find the length of the curve given by the equation y= intergral from pi to x of sqrt(cos(t)) dt for x between pi and pi. I think I know to do this at least part of it. I am using the fundamental theorem of calculus and the arc length formula, but I
asked by Dean on August 2, 2017 
integral
(1) The region in the xy plane bounded by the curve y=x^2, the line x=0 and the line x=5 and the xaxis. find the volume generated (2) Assume that a force of (3x^2x+1)N is pulling an object at each point of the xaxis. find the work done in moving the
asked by matrix school 2 on August 6, 2009 
Trig
Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are
asked by Anonymous on September 10, 2014 
Trig
Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with, and on the same side of, the obelisk. If they find that the angles of elevation from the ground where they are standing to the top of the obelisk are
asked by Harry on September 10, 2014 
Finance
Does anyone know where I can find information about the average industry ratios of financial information? I am working on a project and I would like to include more information. For example, I would like to compare a company's times interest earned ratio
asked by TinkRose on May 17, 2010 
physics
In 5.20 h, a balloon drifts 6.5 km north, 2.00 km east, and 2.76 km in upward elevation from its release point on the ground. (a) Find the magnitude of its average velocity. . km/h (b) Find the angle its average velocity makes with the horizontal. . °
asked by Anonymous on November 28, 2011 
algebra
Selling shirts. If a vendor charges p dollars each for rugby shirts, then he expects to sell 2000 100p shirts at a tournament a) Find a polynomial R(p) that represents the total revenue when the shirts are p dollars each. b) Find R(5), R(10), and R(20).
asked by bobbi on July 23, 2010 
biology
Extremophiles are organisms that thrive in extreme environments. For instance some species of bacteria live in the thermal vents of Yellowstone National Park while others live in the polar ice caps. As you might imagine, these bacteria have some rather
asked by neka on October 15, 2007 
math question
The product of all the positive factors of 20 ( including 20) can be written2^x.5^y. Find x+y. The number 18 is equal to 2 times the sum of its digits: 1+8=9. 2x9=18. There are 4 two digit numbers that are equal to 4 times the sum of their digitss . Find
asked by Sony on March 13, 2013 
matc
If a manufacturer charges q dollars each for footballs, then he can sell 3000150q footballs per week. Find a polynomial R(q) that represents the revenue for one week. Find the weekly revenue if the price is $8 for each football.
asked by lili on January 14, 2010 
physics
?????Two books of mass m1 = 6.9 kg and m2 = 3.8 kg are stacked on a table as shown in the figure below. Find the normal force acting between the table and the book on the bottom. SO g*m1+g*m2=104.86 N = mgcos(θ) N= (104.86)(9.81)Cos? Where do i find cos?
asked by tommy on September 9, 2010 
Physics
A fan rotates from rest and accelerates 1 rad per square second for 1 second find the angular velocity if 1 round= 2 pi find the complete no of rounds the fan rotates at constant velocity during second half of its motion
asked by Zainab on April 12, 2011 
History
I found that Montesquieu and Locke both influenced Jefferson in writing the Declaration. I know how Locke influenced him, but not Montesquieu. I can't seem to find information on that.. can someone tell me where I can find a short summary? All I need is
asked by Meche on November 5, 2007 
math
The weekly demand and supply functions for Sportsman 5 X 7 tents are given by the following respective functions where p is measured in dollars and x is measured in units of a hundred. Find the equilibrium quantity. Find the equilibrium price.
asked by Anastasia on September 21, 2012 
physics
We couldn't find "The mass density of brain matter is 1.040 g/cm^3, and of that, the mass fraction which is hydrogen, is 0.107. Find the number of hydrogen protons in a volume of 1cm^3 of brain tissue"
asked by stephanie on April 11, 2011 
Physics
A simple pendulum in a certain planet is found to vibrate 50 times in 100s. Find its (a) period, (b) its frequency. (c) When 1.5m of its length is cut, it vibrates 50 times in 50 s. Find the original length of the pendulum. thanks in advance
asked by david on February 16, 2013 
Physics Electric
The electric potential in a region is given by V(x,y,z) = 10.0x^2 + 20.0xyz + 6.0y^3 a) Find the electric field that produces this potential? b) Find the amount of charge contained within a cubic region in space 20 cm on a side and centered at the point
asked by LS on December 6, 2014 
Trig
how do i find the exact value of s [pie/2, pie] sin s = radical2/ whole number 2 what is s in radians? how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 454590
asked by ALISON on September 15, 2011 
4th grade math
3. Writing to Explain Use rounding to estimate the product 13 ! 9. Then, use compatible numbers to find the actual answer. If Alison was rounding to find how much 13 books that were $9 apiece cost, would she get a good estimate? Explain
asked by Paulette on August 29, 2012 
Chemistry
I need to find the pH of a 500 mL solution of pure water after adding 33.0 mg of H2SO4 and 18.0 mg of HCl. Please help! So far I have tried to find the moles of 33.0mg of H2SO4 and got 3.24. Then I calculated pH by multiplying the subscript of H (2) by the
asked by Nicole on November 27, 2016 
Stem Cell Research
Hi I need to find 4 articles about stem cell research. 2 need to be ones that just support it and 2 the just oppose it. Does anyone have any link of web sites where I can find this. It can't talk about both it has to oppose or support. Also a website would
asked by Rebekah on February 27, 2010 
Math
Find the equation of the line tangent to curve x=sec(t), y=tan(t), at t=pi/6. I found th slope(derivative of the two which was csc(t). Plugged in Pi/6 and got 2 as the slope. Now how do I find the equation of the tangent? There are like two equations to
asked by Beth on December 17, 2015 
Math
Okay so I have to find how many total squares are in an 8 by 8 checkerboard. I have a roman letter thing that kinda looks like a capitol 'e' but without the middel line. On the bottom I have N=1 on the side of it i have N^2 and 8 on the top. Can anyone
asked by Cameron on October 2, 2007 
calculus
To find the equation of a line, we need the slope of the line and a point on the line. Since we are requested to find the equation of the tangent line at the point (64, 8), we know that (64, 8) is a point on the line. So we just need to find its slope. The
asked by maura on September 14, 2012 
Math Statistics
A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. * a. This sample of 36 has a mean value of , which belongs to a sampling distribution. Find the shape of this sampling distribution. *
asked by Tammy on February 8, 2011 
algebra
You roll a red number cube and a blue number cube. Let A be the event "at least one number cube shows a 6" a) Find P(A) by finding the sum of P(6 on red cube, no 6 on blue cube), P(no 6 on red cube, 6 on blue cube), and P(6 on both cubes) b) Describe the
asked by kms on June 7, 2017 
math
You roll a red number cube and a blue number cube. Let A be the event "at least one number cube shows a 6" a) Find P(A) by finding the sum of P(6 on red cube, no 6 on blue cube), P(no 6 on red cube, 6 on blue cube), and P(6 on both cubes) b) Describe the
asked by kms on June 7, 2017 
History
Please check my answers please. Thank you! 1. The U.S. economy is a free enterprise system. True* False 2. Work you do for pay is called a _____. service industry diverse workforce job* volunteer job 3. When there are many people seeking the same job, this
asked by Anonymous on September 7, 2016 
psy revise please
Question: By the time people reach young adulthood, they have an idea of what causes them stress. The text discusses several sources of stress. What sources of stress did the text identify of which you were previously unaware? Has your reading helped you
asked by rose  Ms. Sue on April 22, 2008 
Calculus
Great! I understand now that C0=f(a) c1=f'(a) c2=f"(a)/2 Now, If I am to find the parabolization of the equation x^2x at x=2, then c0=x^2x=2^22=2 c1=2x1=2(2)1=3 c2=2/2=1 So, the equation (taken from c0+c1(xa)+c2(xa)^2) is >> 2+3(x2)+1(x2)^2?? Is
asked by Matt on November 13, 2006 
Math
At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
asked by Irina on September 15, 2014 
Calculus
Find the intervals where the function f(x)=((2x1)^2)(x3)^2 is concave up and concave down and find all inflection points. Give decimal answers using two decimal place accuracy. Please help me!!! I really don't understand! and please show your work so
asked by Sam on March 17, 2011 
statistics
Help me! Population of heights of college students is approximately normally distributed with a mean of 64.37 inches and standard deviation of 6.26 inches A random sample of 74 heights is obtained. Find the mean and standard error of the x bar distribution
asked by anon on November 6, 2011 
Calculus
Suppose f(x)= e^(1/x). Graph this function in the window 5(
asked by George on November 9, 2009 
statistics
a study found that the average time it took a person to find a new job was 130 days. If a sample of 36 job seekers was surveyed, find the 95% confidence interval of the mean. Assume the standard deviation of the sample is 12 days.
asked by dell on March 19, 2010 
precalculus
At a selling price of $ 54 , a lamp company breaks even on total sales of $ 3564 . If the company's overhead is $ 396 , find the marginal production cost per lamp and find the profit on sales of 145 lamps.
asked by Anonymous on September 15, 2014 
math
The cost in $ of making "x" leaf blowers is given by C(x)=45x+6000. Each blower can be sold for $60.00 a)find revenue function b)find equation that expresees that profit for selling "x" leaf blowers. c)How many units must be sold to break even?
asked by jack on September 15, 2012 
Calculus
Suppose f(x)= e^(1/x). Graph this function in the window 5(
asked by George on November 8, 2009 
Calculus
Given: F(x)= 5x^2 a) find a simplified form of the difference quotient b) find the average rate of change (difference quotient)x=4, h=2 Please help... http://www.mathwords.com/d/difference_quotient.htm Ok I went to this site and I saw the formula, how do I
asked by Dee on February 9, 2007 
statistics
A charity believes that when it puts out an appeal for charitable donations the donations it receives will normally distributed with a mean of $50 and standard deviation of $6, and it is assumed that donations will be independent of each other. (i) Find
asked by Probability on February 15, 2011 
calculus
find derivative y= 3x^56x^3/7secx find dy/dx * xcosy= 5( y+cosx) * X^5Y^3+8XY=466 * A RIGHT TRIANGLE HAS LEGS OF LENGTH 15M AND 7M. THE 7M LEG IS NOT CHANGING. 15M LEG IS GETTING LONGER AT RATE OF 8M PER SECOND. SO WHAT IS RATE OF CHANGE OF THE
asked by aisha on December 16, 2012 
Light Energy Problems
The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal.  The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g
asked by Amy on November 27, 2012 
English
i don't know if you remember helping me with my poem analysis on Amulet by Ted Hughes, but i need more help. i don't know what i'm doing wrong here but i can't find what i'm looking for. So why do you think Ted Hughes wrote this??? what do you think he
asked by HELP Writeacher on November 25, 2007 
physics
A 3.25kg object is attached to a vertical rod by two strings as shown in the figure below. The object rotates in a horizontal circle at constant speed 6.60 m/s. (a) Find the tension in the upper string. N (b) Find the tension in the lower string. N
asked by jojo on March 28, 2016 
physics
A warehouse worker pushes a crate along the floor, as shown in the figure , by a force of 10.0 N that points downward at an angle of 45.0 degree below the horizontal. A. Find the horizontal component of the push. B.Find the vertical component of the push.
asked by andrea on February 2, 2011 
Chemistry
The binding energy of electrons in a metal is 194 kJ/mol. Find the threshold frequency of the metal.  The heat of fusion of ice is 6.00 kJ/mol. Find the number of photons of wavelength = 6.78×10^−6 m that must be absorbed to melt 6.80 g
asked by James on November 28, 2012 
physics
A child ties a rock to a string and whirls it around in a horizontal circle. Assuming a 1.50 m long string making 20.0 ∘ angle below the horizontal, find the speed of the rock. Find the period of its uniform circular motion.
asked by missy on February 9, 2016 
Physics
a 600 gram cart is pulled along a table with no friction by a string attached to a 200g mass hanging over a pulley. find the acceleration. Find the acceleration if the cart is inverted so it slides and the coefficient of friction is 0.2
asked by Phil Miles on January 6, 2013 
physics/maths help damon or steve or scott
A body moves in a straight line,with initial velocity and uniform acceleration.find how far it travels in 12sec.,given that it travels 246m in the first 6 sec.,and 69m in the last 3sec.find the initial velocity. Please show step
asked by weryiyemi on March 22, 2017 
PHYSICS
A warehouse worker pushes a crate along the floor, as shown in the figure , by a force of 10.0 N that points downward at an angle of 45.0 degree below the horizontal. A. Find the horizontal component of the push. B.Find the vertical component of the push.
asked by mely on February 2, 2011 
journalism
Hi I'm supposed to write a story on the school's CSTs scores and eve though I have tried, I haven't been able to find a website with school's scores. If you could find it, I would be very pleased. Thank you in advance Thank you for using the Jiskha
asked by Claudia on April 3, 2007 
algebra
This one really threw me off... find the slope of the line containing the points (x, 2x) and (x + h, 2(x +h)) You have to first find the slope, which is change in y over change in x: {[2(xh)]2x}/[(x+h)x] (2x2h2x)/(x+hx) 2h/h m=2. i don't have an
asked by dee on January 23, 2007 
Calculus
Let R be the region bounded by the yaxis and the curves y = sin x and y = cos x. Answer the following. a)Find the exact area of R. b)A solid is generated by revolving R about the xaxis. Find the exact volume of the solid.
asked by ronnieday on April 20, 2012 
Geology
I need to find some kind of song written after 1990 about geology. It have to do with any part of geology but it just had to be written after 1990. any suggestions about where i might be able to find something like this? thanks
asked by A on October 18, 2006 
math
I am having to find the value of y for the given values of x. I understand how to find the value of x, but I am unsure how to put it in the form of ordered pairs: This is not the actual problem on my assignment: y=7^x, for x=2 y=7^2 y=7*7 y=49 I am lost as
asked by Malissa on February 25, 2010 
Calculus
Let F of x equals the integral from 1 to 3 times x of the natural logarithm of t squared. Use your calculator to find F″(1). A. 12 B. 6 C. 4 D. 1/9 Find the range of the function f of x equals the integral from 0 to x of the square root of the quantity
asked by Justin on July 30, 2019 
Math
Jim was putting carpet in his sons tree house.He needed to find the area of the floor. But he was having trouble with the multiplication. The measurements were 4.2 meters by 6.3 meters. Do the multiplication to help him find the area
asked by Michey on January 10, 2013 
Physics
A stock car starts from rest at time t=0 with velocity (m/s) increasing for 4.0 s , according to the function Vx=1.4t2+1.1t. a) Find the car's velocity at the end of the 4.0 s interval. b) Find the average acceleration for this interval.
asked by Kay on January 21, 2017 
physics
Two blocks of equal masses are connected by a string. Block 1 is pulled by a force of 30 N which accelerates both blocks at 3 m/s2 along a surface of negligible friction A) find the masses of each block B) find the tension
asked by Thikha on January 26, 2015 
statistics
Please help. I have no idea what I am doing Use the standard normal (z score) table to find: P(1.00 ≤ z) & Find the probability that a data value picked at random from a normal population will have a standard score (z) that lies between the following
asked by sharon on December 29, 2017 
Chemistry
How do you find the number of valence electrons in a molecule? Do I need to use the Lewis structure diagram to find out? Please help! I need to the total number of valence electrons for SiH4, H2SO4, CCl4, BF3 and I don't know how!
asked by Anonymous on February 10, 2010 
physics
The current density in a cylindrical conductor of radius R = 59.5 cm, varies as J(r) = J0r/R (in the region from zero to R), where J0 = 0.423 C/m2. a) Find the magnitude of the magnetic field at r = 29.75 cm. b) Find the magnitude of the magnetic field at
asked by Anonymous on December 10, 2012 
Physics
A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. a)Find the magnitude of its acceleration. Answer in units of m/s^2. b)Find the time it takes the boat to travel this distance. Answer in units of s.
asked by Smith on February 5, 2014 
College Physics
Two long, parallel wires separated by 50 cm each carry currents of 3.0 A in a horizontal direction. Find the magnetic field midway between the wires if the currents are in the same direction. B= T Find if they are in opposite directions. B= T
asked by Lanise on February 19, 2010 
Calculus
PLZ show work, find the rieman sum of 6 intervals of sinx from (0,pie) also find the absolute min and max of ln(2+sinx) for pie(or equal to) 2pie
asked by ALEX on January 19, 2011 
SAT Math
Can I please get some help on these questions: 1. If , find the value of 2 square root of 17x = 2x10, find the value of x/4. 2. If absolute value of 3x+6 < 9, then which of the following is a possible value of x ? My answer choices are 7, 1, 5, 1, 10.
asked by mysterychicken on June 1, 2013
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