Posts by Barry
Total # Posts: 113

Maths
Please help. I completed 16 but these 4 are hard; the wording confusing. 1) Jane is playing a game of Monopoly, if she throws six on her next turn she will land on community chest. If she throws eight she will land on Mayfair with a hotel (owned by another player). Of the 20 ... 
Statistics
I have completed 6 questions but after 2 hours still cannot do these 4 questions. Please help 1) Jane is playing a game of Monopoly, if she throws six on her next turn she will land on community chest. If she throws eight she will land on Mayfair with a hotel (owned by another... 
Matrix application
Part of the road is to be on a parabolic curve given by a function of the form y = ax^2 + bx + c where x and y are local coordinates. The road alignment must pass through the following 3 points: x = 150m y = 190.650m x = 300m y = 611.450m x = 450m y = 831.141m Substitute ... 
math
A paper cone has a base diameter of 8cm and a height of 3cm a. Calculate the volume of the cone in term of pie b. Calculate the curve surface area of the cone 
Physics
There is an outcropping of ice with a large drop to a slope below. A 100kg piece of ice breaks off with a 60kg person on top of it, and falls o the slope below. The piece of ice slides down the slope to the bottom and onto a horizontal portion. It slides to a stop at a ... 
calculas
Assume x and y are functions of t, Evaluate dy/dt, 3xy6x+2y^2 dx/dt=6 x=2 y=3 dy/dt 
calculas
Please help don't understand how to solve it. 3xy6x+2y^2 dx/dt=6 x=2 y=3 thank you 
math
an airplane flies at 150 mph and heads N 30 degrees east. A 40 mph wind blows it in the direction S 30 degrees E. What is the planes resultant velocity 
Science
Calculate the resultant of force of 200 N due west and a force of 90 N at 60 degree NW 
Chemistry
One ppm is one millionth of a gram or in simpler terms, 10^6. 
math
I don't understand factoring. One of my homework questions asks for that. The question is "The area of a rectangular garden is given by the trinomial x to the 2nd power plus x 42. What are the possible dimensions of the rectangle? Use factoring. 
math derivatives
An architect is designing a rectangular building in which the front wall costs twice as much per linear metre as the other 3 walls. The building is to cover 1350 m2. What dimensions must it have so that the costs of the walls is a minimum? write a formula using derivatives 
Derivatives Instantaneous rate of change
The electric field E at a distance r from a point field is E =K/r^2 where k is a constant. Find an expression for the instantaneous rate of change of the electric field with respect to r. 
Math natural logarithms
The efficiency e of a gasoline engine as a function of its compression ratio r is given by e =1− r^(1−γ) , where γ is a constant. Find γ for e = 0.55 and r = 7.5 
Algebra
1.1 
math
Assume the brakes of an automobile produce a constant deceleration of k ft/sec^2. Determine what k must be to bring an automobile traveling 60 mph to a rest in a distance of 100 ft from the point where breaks are applied? With the same k, how far would a car traveling 30mph ... 
science
If a car has a constant acceleration of 4 m/s², starting from rest, how far has it travelled by the time it reaches the speed of 40 m/s? 
math
thanks the weebsite is fun 
math
how is GCF and LCM different? im in 4th grade and i tried to understand but my mum said shes not sure so please i need help 
math
find the exact value cos (5 pi/ 12) 
Physics
At time t = 0, a projectile is launched from ground level. At t = 2.00 s, it is displaced d = 53 m horizontally and h = 54 m vertically above the launch point. What are the (a) horizontal and (b) vertical components of the initial velocity of the projectile? (c) At the instant... 
math
Dear Roberta, the answer should be D recall the identity (ab)^2 = a^2  2ab + b^2 Hope it helps Wishing you the best of luck barry 
math
Dear Roberta, the answer is D (1/2)(10t) =50,000 (10t) =50,000 /(1/2) 10t= 100000 t = 10000 Hope it helps! Wishing you the best of luck Barry 
math
Dear Roberta, Let the number of people be y 100 + 20y = 25 + 25 y 75 = 5y y = 15 So the answer should be B Hope it helps! Wishing you the best of luck, Barry 
Algebra
Dear sharon, 840 x 0.02 = 16.8(decimal number) 16(integer) Hope it helps! wishing you the best of luck Barry 
Math
Hi! the question is ¡Ô(4x+1) + ¡Ô(x+1) = 2 Square both sides (¡Ô(4x+1) + ¡Ô(x+1))^2 = 2^2 still remember the identity (a+b)^2 = a^2 + 2ab + b^2 let ¡Ô(4x+1) be a ¡Ô(x+1) be b as a^2 + 2ab + b^2 we can ... 
Algebra
Dear sharon, the first equation y = 7x  9 slope= 7 yintercept= 9 the second equation 3y = 21x + 7 y = 7x (7/3) slope= 7 yintercept= (7/3) To determine whether the two lines are perpendicular slope of equation 1 X slope of equation 2 must be 1. But in this case, ... 
math
Dear Kyle, the equation of circle let (h,k) be the center of the circle let the radius be r then the equation of circle will be (xh)^2 + (yk)^2 = r^2 so according to your equation of circle given the center point= (5,7) 
math
Dear Kyle, Sub (a,3) into the equation 5x + y = 8 5a + 3 = 8 5a = 5 a = 1 Hope it helps! wishing you the best of luck, Barry 
chem/math
Dear Ann, 3.88 = 3.74 + log (x/0.1) 0.14 = log (x/0.1) 10^(0.14) = x/0.1 x = 1.38 x 0.1 x= 0.138 These are the calculation steps. I suppose the answer is 0.138 instead of 0.137. Ann,do you mind showing your calculation steps so I can know what is your mistakes during the ... 
algebra
Dear Marcus, The answer is 1/(2x^9y^3) since [10x13y^12]^0 = 1 as there is a rule <y^0 = 1> And the denominator cannot be further simply Hope it helps! 
Math
Dear High, The amount that you are going to get =1000 x (1+(0.08/4))^(4x7) =1741.024 For the interest that you are going to get= 1741.0241000 = 741.024 
chemistry
Dear shashank, The chemical formula of FeSo4.7H2O = 55.8+ 32.1+ 16x4 + 7x18 = 277.9 The percentage of water of crystallization= = (7x18)/ 277.9 x 100% = 45.34% 
Chemistry
Dear akhmal, mol of sucrose used= 1/(12x12 + 22 + 11X16) = 2.92x10^3 as 1 mole of sucrose will produce 12 moles of Co2 mol of CO2 produced= (2.92x10^3)X 12 = 0.035 grams of CO2 produced = 0.035 X (12+32) = 1.54g as 1 mole of sucrose will react with 12 moles of o2 mole of O2 ... 
chem
Dear marie, I guess there is no AlO3 existing So do you actually mean aluminium oxide (Al2O3) The balanced equation is 3OH + AL3+ > Al(OH)3 mol of aluminium oxide needed= 98.1 as 1 mole of aluminium oxide required 3 moles of sodium hydroxide to react with mol of ... 
math
I= PRT Simple interest = 280 Nigerian naira X 2.5 X 0.03 = 21 Nigerian naira 
rates
The amount of petrol required for each Km = 18/90 =0.2L The amount of petrol needed for 200km =0.2x200 =40L 
maths
The largest share is 650x(6/13) = 300 
Chemistry
Dear Sally, as I have replied you before, I am not sure whether you have checked HCL(aq) + NAOH(aq) NACL(s)+ H20(l) Number of moles in the NAOH(aq)= 40/(23+16+1) =1 as 1 mole of HCL will react with 1 mole of the Naoh solution number of mole of HCL required= 1 Still ... 
Chemistry
Dear Sally, Here is the balanced equation HCL(aq) + NAOH(aq) NACL(s)+ H20(l) Number of moles in the NAOH(aq)= 40/(23+16+1) =1 as 1 mole of HCL will react with 1 mole of the Naoh solution number of mole of HCL required= 1 Still remember that there is a equation mol= g/molar... 
chemistry
Dear hifsa still remember there is a formula Molarity= mol/dm cube so ........ 0.5= mole/ (1.25/1000) number of mole= 6.25x10^4 
Chemistry
Dear Brett, molar mass of the HNO3= 1+14+16x3 =63 number of moles of the HNO3 produced in the reaction = 7.5/63 = 0.119 According to the equation provided 3 moles of NO2 will produce 2 moles of HNO3 Thus,number of moles of NO2 required= 0.119/2x3 = 0.179 mass of N02 required= ... 
Chemisty
Dear Veronica, number of moles of HNO3 used= 0.602x(23.4/1000) = 0.014 number of mol of Cu used= 0.014/8x3 =5.28255x10^3 mass of the Cu involved in the reaction = 5.28255x10^3 x 63.5 = 0.33544g %by mass of Cu = 0.33544/0.411 x 100% = 81.6% 
Chemistry
Dear Abdulhafiz the no of mole of the 50ml of ph3 solution= (1x10^3)x (50/1000) = 5x10^5 the number of moles in the 50ml of ph5 solution= (1x10^5) x (50/1000) = 5x10^7 Total no of moles in the solution = 5x10^5 + 5x10^7 = 5.05x10^5 The molarity of the new soltion = (5.... 
Chemestry
how to balence an equasion 
MATH ✿łāCheckłą✿
3/ (6+5+4+3) = 1/6 
add maths
Dear Mandy, Here is the solution log2 0.45 = log2 (9/20) = log2 9  log2 20 = 2log2 3  log2 (4x5) = 2h (log2 4 + log2 5) = 2h(2+k) = 2h2k Hope this helps 
biology
I have to do a lab report on the effect of metal ions on enzyme activity One of the questions asked the sources of error and one asked the methods used I got stuck, can you pls help 
Algebra
each side of the new area of the garden = 13 since 13x13 = 169 (side x side = area of square) so 139 =4m Therefore, 4m should be the answer 
PreCal
log(base 3) x*(x80)=4 3^4 = x(x80) 81 = x^2  80 quadratic equation x= 1(rejected) or 81 x= 81 log properties used= log(base a)b=k a^k=b hope it helps :) 
PreCal
log(1/4) = (3x+5)log8 log0.25/log8 = 3x+5 2/3 = 3x+5 x= 17/9 
Probability
1/13 
SCIENCE HELP PLEASE
Am be 
SCIENCE
Scientifically if the moon spun on the same rotational period as earth we would typically see the different parts of the moon 
Math
4x4+4x4+44x4=? 
Eng B
Beyond tone a poet's attitude toward his or her subject reveals to us a poem's? A. theme B. subject C. diction D. structure I think it's A. LiteratureHelp me Ms. Sue  Ms. Sue, Thursday, July 3, 2014 at 8:35pm I agree. this person must have been really happy! You ... 
Math
A manufacturer of softdrinks advertises that their orange soda as "naturally flavored," although it contains only 5% orange juice. A new federal regulation stipulates that to be called "natural" a drink must contain at least 10% fruit juice. How much pure ... 
Math
A pot contains 6 liters of brine at a concentration of 120g/l. How many liters of the water should be boiled off so that concentration of the brine is 200g/l. 
math
I have a diagram of an occupied building space within a larger building represented by 49 equal squares but no linear measures for the sides. The space is 120,000 sq ft. how can i estimate the lengths and widths of the floor space with just this information? 
mathurgent please help
Newton’s Law of Cooling states that the temperature of a heated object decreases exponentially over time toward the temperature of the surrounding medium. The temperature u of a heated object at a given time t can be modeled by the following function: u(t)=T+(uT)e^kt K&... 
math
you have an unfortunate brush with the law and you are required to spend some time in the penitentiary. (Naturally you have brought your math 30 course notes with you for a bit of light bedtime reading. You also hope to enlighten your fellow inmates with your mathematical ... 
algebra
4x5=6+3x 
math
simplify this expression (3xy)^2(2x^2z)^3 
Math
A piece plywood 24 inches wide is cut into strips 2 and a half inches wide, how many strips of this with can be cut. Please help,7th grade. 
Physics
A ball was thrown straight up at 26.2 m/s then caught at the same place it was released. How many seconds was it in the air? 
Physics
A brick dropped from a roof hits the ground 4.14 seconds later. How high (in m) was the roof? 
chemistry
ethanol is a common laboratory solvent and has a density of 0.789 g/ml what is the mass in grams of 139 mL of ethanol 
math
is 6.31 equal to 0.631 
Physics
A prism, made of glass of refractive index 1.50, has two plane faces at an angle 33 to each other. A ray of light enters the glass from one side perpendicular to that face and emerges through the other. Part A: As the ray enters the glass, what is its angle of incidence ? Give... 
Physics
Laser light with a wavelength = 665 illuminates a pair of slits at normal incidence. What slit separation will produce firstorder maxima (i.e. m=1) at angles of 8 from the incident (or straight through) direction? Remember, 1 nm = m. Express your answer using two significant ... 
Physics
A submerged scuba diver looks up towards the calm water of a lake and notes that the Sun appears to be 20 from the vertical. The diver's friend, standing on the shore of the lake, is also looking at the Sun. At what angle from the vertical does the diver's friend see ... 
Physics
I don't know how to calculate it, that's why I was looking for help 
Physics
A large fish tank is filled with water (of refractive index 1.33). One side of the tank is made of a parallelsided piece of glass. A ray of light strikes the glass from the outside at an angle of incidence of 48. Estimate the angle through which this ray is deviated as it ... 
math
how to solve the set of system equations 6x  y  2 = 0 dan 3x  2y + 5 = 0 
math algebra
If the principal P = $900, the rate r = 4 1/2, and time t = 1 year, find the following: What is the amount of interest? What is the future value? 
business
2. Think of a risk response plan that you have in your personal life, such as automobile, homeowner’s, or renter’s insurance. What were some of the decision criteria that influenced your decision about how much coverage to purchase? How does your decisionmaking ... 
business
1. What kind of risk analysis would you use when purchasing a house or a personal vehicle? Describe this analysis. How does this process assist you in making your decision? Do you believe the process is efficient and achieves the results you desire? How might you improve your ... 
Finding gradient at a given point
44x + 11 :) 
math
5/18 
Math
6.34 x 10 to the fifth power 
Physics
5000 / (72*144) pounds /inch^2 does this help baz my friend? 
Physics
How much pressure is exerted by a 5000 pound moving vehicle vehicle (hehicle is 6' x 12')? 
spanish
How would I complete this question? hago mi tarea en la_______ 
1st grade
if yo have three words friend, things & might which word has the long i sound and which word can you get by adding a sound to in? a tin,b hid c find 
Grammar
Which sounds better my brother knows more about technology than me or I 
math
for people each bought two bottles of vermont maple syrup. each person plans to share their bottle with three friends. how much does each person get? 
grammar
The dock is on Fish Lane. CAPITALIZE the proper nouns in the sentence. 
grammar
trying to Capitalize the proper nouns in the sentence 
garmma
She and mom got to the Dock late. 
physic
WAIT!!!!! i did hr instead of h+r... therefore rework the steps with h+re instead of hre..... sorry 
physic
which it's not at all... if you start with g=GMe/re^2 then the difference in the two gravitys would be: (GMe/re^2)(GMe/(hre)^2=.007 to get like sides here, start by factoring out a GME... leaving you with GMe(1/re^2  1/(hre)^2)=.007 divide both sides by GMe and you ... 
physic
Actually, to do it the way he did would be wrong all together, because you would have to foil the (1+h/re)^2... you would have to multiply bothe sides by (1+h/re)^2 first... giving you: GMeGMe=.007(1+h/re)^2 Obviously, GMeGMe would give you zero... creating a quadractic ... 
literature
"The best in this kind are but shadows" is 
Physics121
What are the three longest wavelengths for standing sound waves in a 124cmlong tube that is (a) open at both ends and (b) open at one end, closed at the other? 
1st grade
She and mon got to the Dock late. 
Accounting
Horse Country Living publishes a monthly magazine for which a 12month subscription costs $30. All subscriptions require payment of the full $30 in advance. On August 1, 2008, the balance in the Subscriptions Received in Advance account was $40,500. During the month of August... 
Writing
How can we answer this question in that section 1 and2 
human life
WHOSE LIFE IS IMPORTANT? 
Business English
Sorry if I spelled your name wrong. If you do not care it would be some good news joceyln 
Business English
Wow. You have a lot of posts for your question Jocelyn