Sunday
December 4, 2016

Posts by John

Total # Posts: 8,154

Math
I have 3 nickels, 1 quarter, and 1 penny in my pocket. If I pick out a coin from my pocket, do not replace it, then pick out a second coin from my pocket, what is the probability that the second coin that I pick out of my pocket is a nickel? So far I have come up with this: P(...
April 9, 2016

physics
Here is an equation called Coulomb's Law that might help you find the answers: Force of electricity= k x (q1 x q2)/r^2 k= Coulomb's constant= 9x10^9 q1= charge 1 q2= charge 2 r= distance between two charges Just plug in numbers to the equation and find the force. Then...
April 9, 2016

Pysics
Remember that the net momentum before a collision is equal to the net momentum after a collision. Let momentum= p, mass= m, and v= velocity. Even though a pound is not a measurement unit of mass, it is linearly correlated with it, so let's use pounds to measure measure ...
April 9, 2016

Biology
The cells in them are the ones that control them
April 9, 2016

Chemistry
what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57
April 9, 2016

Chemistry
what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57 pH 1.57 H3O = 10^-1.57= .027mol/L .027(4)= .108mol/L 36.46(.108)=3.9g
April 8, 2016

Algebra
A bottle rocket launches into the air. The equation h=-16t^2+64t+9 gives the height of the ball, h in feet, as a function of t, number of seconds after launch. What is the maximum height the ball reaches? How many seconds does it take the ball to reach that height?
April 8, 2016

Math
Hi, Can you please show the steps for C(10,8)(1/2)^8 (1/2)^2 + C(10,9)(1/2)^9(1/2) + C(10,10) (1/2)^10 to = (1/2)^10 ( 45 + 9 + 1) I am a bit confused. Thank you in advance :)
April 7, 2016

Maths
2x^3 - 12x^2 - 32x
April 7, 2016

Dosage calculations please
Ordered: Tegretol 150 mg po BID Supplied: Tegretol 20 mg / tablet 1. How many tablets would you administer per dose? 2. How tablets would you administer per 24 hours? 1. 150/20 x 1 = 7.5 tablets per dose 2. 150mg/2 = x/24 =1,800 tablets ? I am very confused on second question.
April 6, 2016

Dosage calculations
I did this 0.5/ 100 x 1 = 0.005 but the answer is 1.5ml.
April 5, 2016

Dosage calculations
The physician ordered 0.5 mL of meperidine hydro chloride. The med's drug label reads 100mg/mL. The patient will receive __________? I have no idea how to do it please.
April 5, 2016

Math
The measures of the sides of a right triangle form an arithmetic sequence of common difference 2. What are these measures?
April 5, 2016

Chemistry
I'm stuck.
April 5, 2016

Chemistry
Also I found the Ksp values from my text. It says Pb = 2.53E–8 and Sr = 3.44E–7. Could you re-write with those values so that I can understand it better please? I really appreciate your help.
April 5, 2016

Chemistry
Hey Dr. Bob. I'm not sure where you got the 1.6E-8 from?
April 5, 2016

Chemistry
A solution contains 0.0390 M Pb2 (aq) and 0.0390 M Sr2 (aq). If we add SO42–(aq), what will be the concentration of Pb2 (aq) when SrSO4(s) begins to precipitate? I am just completely lost on this one.
April 5, 2016

math
The age of a man and his son adds up to 36years old.if the father is 30years more than his son .how old is the father and the son?
April 4, 2016

Statistics
A sign on the petrol pumps of a chain of petrol stations encourages customers to have their oil checked, claiming that one out of every four cars should have its oil topped up. Assuming this claim is true: (b) What is the probability that at least half of the next 10 cars ...
April 4, 2016

Business Statistics
(a) Of the next 10 cars entering a petrol station, what is the probability that exactly three of them should have their oil topped up?
April 4, 2016

History Help!
Is it d?
April 4, 2016

History Help!
It says that they wanted the rich land, but none of my answers relate to this. @Reed
April 4, 2016

History Help!
1.How did New England's textile industry affect women? -New technologies required men to work far from their wives and families -The jobs in this field were considered "mens work," and women were not hired -The need for unskilled labor provided low-paying factory...
April 4, 2016

chemistry
Given overall reaction: P4 + 10Cl2 ---> 4PCl5 Delta H for the reaction = ? PCl5 -----> PCl3 + Cl2 Delta H = +157 kJ P4 + 6Cl2 ----> 4PCl3 Delta H = -1207 kJ Calculate the Delta H for the overall reaction.
March 31, 2016

Physics-mechanics
A child's toy car runs off a battery that can supply 105 Wh of energy. If all losses (including friction) consume 45.0% of the energy available and the rider and car have a combined weight of 910 N, determine the height of the largest hill the child can climb in the car in...
March 29, 2016

algebra
I have a rectangular prism with a volume of 48 cubic feet and a height of 3/4 foot. The base of the rectangular prism is not a square and the width is greater than 2 feet. What is the length and width of the rectangular prism?
March 28, 2016

chemistry
Calculate the pH after addition of 16.36 mL of 0.1349 M HBr to 25.00 mL of 0.1444 M NH3. Kb(NH3) = 1.800e-5. Answer: 9.059 PLEASE SHOW STEPS!
March 27, 2016

math
The new capacity is 4+x=y Where x is the pure anti-freeze, y is the total capacity. 4+x=y 0.25(4)+x=0.5y 1+x=2+0.5x x=2 He needs to add 2 gallons of pure anti-freeze.
March 26, 2016

Math
f the air temperature at ground level is 90degrees°​F, the air temperature x miles high is given by ​T(x)equals=90minus−19x. Determine the altitudes at which the air temperature is from 52degrees°F to 42.5degrees°F.
March 25, 2016

statistics
what is the range of probability
March 24, 2016

Physics
Amotorvehicle of mass 1200kg is travelling along alevel road at 54km/hr.The breaks are then applied and the speed of the vehicle reduced to 18km/hr over adistance of 50M .if the afriction motion resistant is constant at 160N .calculate the effective braking force of the brakes...
March 24, 2016

Statistics
A flower shop wishes to add the valuable Waimea orchid to its product list. They purchase a large shipment of bulbs from a supplier in Kauai. It is established by Mendelian theory that the predominant colors in the Waimea orchid (blue, red, violet, orange) will occur with the ...
March 24, 2016

Statistics
A marketing researcher decides to test whether coffee drinkers have a favorable view of coffee labeled as “Fair Trade.” He has 15 randomly selected coffee drinkers taste his company’s Morning Blend, then the exact same coffee labeled Fair Trade Blend. They are ...
March 24, 2016

Chemistry
mols H2=1.106 mols I2=0.218 molar mass of H2=2.016 and divide 2.23g by 2.016 moles of H2 to moles of HI=2.212 moles of I2 to HI=0.436 so limiting reagent is I grams of HI=511.6 (2*255.8) percent yield=8.4% (43.1/511.6) What did I do wrong?
March 22, 2016

Chemistry
What is the percent yield of the reaction below if 2.23g of hydrogen gas react with 55.3 g of iodine to produce 43.1g of HI. use the equation below: H2+I2=2HI the answers: a) 21.8 b) 77.3 c) 33.7 d) 87.1 I started by trying to find the limiting reagent. I multiplied the 2.23 g...
March 22, 2016

Physics
An electric kettle has a power of 1.2kw. How long will it take to heat 3 kg of water to the from 20¡ãC to 100¡ãC?
March 22, 2016

Trigonometry
A wheel has a 12 inch radius rotating at 620 RPM. What is the speed of the car in MPH?
March 21, 2016

electrical electronics
Find the value of the remaining components of a common emmitter amplifer circuit given Ic=3mA, Tr=ZTx300, hfe=80, F=40Hz, Ve=2.5 show workings
March 20, 2016

electricity and magnetism
Four equal point charges, +3micro coulomb, are placed at the four corners of a square that is 40cm on a side. Find the force on any one of the charges.
March 19, 2016

Physics
A device that can alter the resistance in a circuit is known as a: a. switch b. potentiometer c. circuit breaker d. ammeter
March 18, 2016

math(mechanics static)
Three identical sphere with the same size and same weight. A 100N sphere is placed at th top of the 3 spheres. Find the contact force between the 3 spheres & the 100N sphere.
March 15, 2016

life orientation
Four aspects when choosing subjects
March 15, 2016

Physics
a speeding car is driving at 120 km/h when it passes a police cruiser that is driving at 100 km/h. One second later, the police cruiser accelerates uniformly at 15 km/h until it reaches a speed of 135 km/h. how long does it take the police cruiser to catch the car
March 10, 2016

Math
Convert 9 pounds 6 ounces into Kg.
March 9, 2016

Math
How to solve this problem? Here is what I have done so far. question --> 12(1/2)% x (1/2)/(3/4) First i solved the fractions (1/2) x (4/3) =4/6 I changed the 12(1/2)% into a decimal by solving 1/2, which is .5 which equals to 12.5 Answer is 1/12 but I have no idea how it ...
March 9, 2016

math
log(3) 9 = 2 The 3 that I put in ( ) should be lowered to a subscript.
March 9, 2016

math
This is similar to one I answered yesterday. between 0 and 5 inclusive the function = 2 between 5 exclusive and 10 inclusive function = 11-t between 10 exclusive and 14 inclusive function = 7 The cheapest would be 2 so that would be Nov. 7 and 8. c(12) used last one 7 c(5) use...
March 9, 2016

algebra
x = amount at 12% y = amount at 8% x + y = 12000 .12x +.08y = 1240 multiply by 100 to clear decimals 12x + 8y = 124000 -8x -8y = -96000 4x = 28000 x = 7000 y = 5000
March 9, 2016

Pre-algebra
I agree.
March 9, 2016

Math
Please what are the steps to solving this problem? I am stuck. question= 12 1/2% x (1/2)/(3/4) 12(1/2)% = 12.5 (1/2) x (4/3) 4/6 = 2/3 I don't know what to do next.
March 9, 2016

MATH.
y = x^9 times 5 + 6 trade the letters x = y^9 times 5 +6 Solve for y (x-6)/5 = y^9 take the 9th root of each side the 9th root of (x-6)/5
March 8, 2016

math
46 and 76 other means you add them together. 23/61
March 8, 2016

Math
You need a circle here. x^2 + y^2 = r^2 x^2 + y^2 = 100
March 8, 2016

Math
It is 27/161 161 dispensed of which 27 were white so that means 27 of the 161.
March 8, 2016

Math
The same as we have been doing in early questions. Can you tell me how you would set this up?
March 8, 2016

Math
We need more information to answer this question. 5/8 b + 5/9 g +48 =????
March 8, 2016

math
80 times 356 60 times 275 45 times 369 Add the answers you get for each multiplication and you will have your answer That should give you your answer.
March 8, 2016

Math
I think you want to give your brother 1/3 of what is left over right? You need the 3/4 for your shelf. If that is the case. 3/4 of 8 = 6 you take 6' for yourself and there is 2 feet left over and you will give your brother 2/3 ft. If it means that you give your brother 1/3...
March 8, 2016

math
12/4 = 3 so we have 12 1/4 cups plus the extra 1/4 cup gives us 13 1/4 cups.
March 8, 2016

Math
55 shows 45 were sold out 45/55 simplify.
March 8, 2016

Common core standard. math
W = 5/6 L A = L times W A = l times 5/6 L 360 = 5/6 times L squared 360 times 6/5 = L squared Multiply 360 times 6 divide that answer by 5. Now take the square root to find L.
March 8, 2016

Math
Yes.
March 8, 2016

Math
pentagon has 5 equal sides. Divide 16 by 5 to get your answer.
March 8, 2016

Math
It looks like the cheapest time would be between Oct. 20th and Oct. 23rd. c(9) would be 8 c(2) would be 3 The difference is 5.
March 8, 2016

math
77 trains and 55 were full 55/77 or 5/7 would be the probability written as a fraction.
March 8, 2016

Math
3 and 7/8 would be between 3 and 4, but closer to 4. You have to see if the ruler is marked in 8th or something else. If it is marked with 8ths, then count out 7 from the 3.
March 8, 2016

Math
I just did this below.
March 8, 2016

math
3.64 -3.25 divide by 3.25
March 8, 2016

Math
(x -3)(3 2/5) = 15 3/10 (x-3) (17/5) = 153/10 (x-3) = (153/10)(5/17) x-3 = 153/34 x-3 = 4 1/2 x = 7 1/2
March 8, 2016

Algebra 2 b
30 + x + x = 100 30 + 2x =100 2x = 70 x= 35
March 8, 2016

math
the slope you need the change in y divided by the change in x. -2 - 0 divided by 3 - (-1) -2/4 = -1/2 so I agree with you. y = -1/2 x + b you can choose either point and put in the x and y and solve for b. 0 = -1/2(-1) + b 0 = 1/2 + b -1/2 = b This is odd, but it can happen y...
March 8, 2016

math
And so we will multiply the two probabilities green even 3/6 or 1/2 white greater than 2 4/6 or 2/3 probability is 1/2 times 2/3 = 2/6 or 1/3 or as a decimal .333
March 8, 2016

MATH
Nina = sam + 4 (Nina +1) = (Sam +1) +3 Sam + 4 + 1 = Sam + 4 5 = 4 for a final answer which is a false statement; therefore there is no solution. Something is wrong with the problem as written.
March 8, 2016

database
what is InnoDB
March 8, 2016

engineering
an overview of MyISAM and InnoDB
March 7, 2016

prt 305
factors that affect location decisions
March 7, 2016

electrical technology
A battery of 9 V charges a capacitor of 47 ìF through a resistor. What resistor value needs to be used to obtain a voltage across the capacitor of 8 V when 10 seconds have elapsed ? You will need to obtain the standard equation for the voltage across the capacitor ...
March 7, 2016

math
54 to 96 reading the first number as the stem and the other numbers as the leafs. the range is the difference between those 2 numbers.
March 7, 2016

precalc
2 log(3x+1) = 3 log(x-2) Get this step by using the law of logs regarding exponents. log(3x +1) /log (x-2) = 3/2 log (3x + 1 -x +2) = 3/2 log (2x + 3) = 3/2 can you finish from here?
March 7, 2016

Math
Could it be?? 171 this number has 1 hundred 7 tens and 1 one. or many, many other choices.
March 7, 2016

math
Get a common denominator of 35 2/5 times 7/7 = 14/35 2/7 times 5/5 = 10/35 He uses 24/35 what is left.. subtract from 1 or 35/35
March 7, 2016

Statistics
Find the z-score 72-69 divided by 2.8 = 1.07 for a z-score. What percent are over 6 feet tall, so we want the right tail. You can use a z-table to find the value. Unfortunately, not all z-tables are constructed the same way. If you have a TI-83 or 84 calculator, you can use ...
March 6, 2016

algebra 1
It is difficult to work with a negative coefficient of x^2. Factor out the -8 (-8)(2x^2 - 12x - 25) (-8)(2x + 5)(x -5)
March 6, 2016

algebra 1
One method is that it looks like a perfect square since the first and last terms are perfect squares. (2x+3)^2 However, if you do the check you will get 12x for the middle term and not 16x. So.. that method doesn't work. another method would be the guess method (2x )(2x ) ...
March 6, 2016

Math
Here you need to use the law of logs. Anything that is added will be multiplied, anything that is subtracted will be divided, anything that is multiplied will be taken to a power. log(base5) (8/2)(15/2)^3 divided by 81/8 Simplify this first and then continue.
March 6, 2016

math
The board is 7 feet which is 84 inches. Do you have a typo regarding that length or the 99 inches?
March 6, 2016

statics
To make both: .6 times .6 = .36 Make at least one of two: 1st 2nd make .6 make .6 miss .4 miss .4 make .3 miss .7 Makes at least one means one or two made (.6)(.6) + (.6)(.4) + (.4)(.3 multiply and sum and you should get your answer.
March 6, 2016

stats
n = (z times sigma divided by E)^2 n = (1.96)(1.2)/.05 = 15.68 now square 245.8 or 246
March 6, 2016

maths
Multiply by 4 to get your answer.
March 6, 2016

math
Divide 4.35 by .05 to get the number of nickels. Then relate that back to the problem. Do you need to add or subtract 5 nickels to get the answer?
March 5, 2016

Geometry
You want to compare length to length and width to width to make your ratio. 10/4 = x/6 cross multiply: 60 = 4x x = 15 Check the answer to see if you get the same ratio 10/15 is that the same as 4/6 Yes.. they both reduce to 2/3.
March 5, 2016

Math
You would pay 28% which means you will be able to keep 72% (100-28) You will then have 72% of 7% or .72 times .07 will give the correct answers. (1-.28)(.07) is the specific formula. Can you come up with a general formula?
March 5, 2016

math
From these numbers it seems that 3/12 would be broken so that is 1/4 or 25%. Multiply 3000 times .25 to find out how many might be broken.
March 5, 2016

Statistics
Ho: null hypothesis Ha: alternative hypothesis When you do a test, if you p-value is small enough than you can reject the null hypothesis which means there is not enough evidence to support the null. If the p-value is large than you fail to reject the null You are usually ...
March 5, 2016

math
A confectioner has 300 pounds of a chocolate that is 1 part cocoa butter to 7 parts caramel. How much chocolate that is 1 part cocoa butter to 15 parts caramel should be combined with the first in order to create a new chocolate that is 1 part cocoa butter to 9 parts caramel? ...
March 5, 2016

World Geography
How has the region attempted to change its future so that they will be less dependent on oil wealth in the coming decades? A. By improving education B. By increasing government control in the economy C. By ceasing to export oil to other parts of the world D. By shifting their ...
March 4, 2016

World Geography
Which religious group is found in the western parts of Eastern Europe? A. Roman Catholics B. Eastern Orthodox C. Muslims D. Protestants I put B but that was incorrect
March 2, 2016

Math
one can of concentrate to four cans water makes juice. If I have 24 cans of juice, how many cans of water did I use
March 2, 2016

physics
determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s
March 2, 2016

Math
If 12 cookies sell for 4.80 cents, then how much money would it be for 20 cookies?
March 2, 2016

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