Friday

July 1, 2016
Total # Posts: 7,802

**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 dont 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*

**Calculus help, very confused!!**

I'm working on the same problem, any chance you could help me through the second derivative test section?
*February 29, 2016*

**physics **

a 55 kg satellite is in circular orbit earth with an orbital radius of 7.4 x 10^6 m . determine the satellite’s a)kinetic energy b)gravitational potential energy c)total energy d)binding energy
*February 29, 2016*

**physics **

an object is hung from a vertical spring, extending it by 24cm.if the spring constant is 35 N/m, what is the potential energy of the stretched spring ?
*February 29, 2016*

**Life orientation**

Do you know what xenophobia is?
*February 28, 2016*

**medical Terminology**

I agree.
*February 28, 2016*

**Math**

amount times 6% = 59.00 .06 x = 59 divide 59 by .06 to get the answer.
*February 28, 2016*

**Math**

Are you talking about the diameter being 15 in? If so: C = pi times d C = 3.14 times 15 If you were talking about a radius, then you have to double the radius to get the diameter.
*February 26, 2016*

**Math**

calories per hour burned depends on the persons weight and the rate they are riding the bicycle. You could start the function rule there.
*February 26, 2016*

**Statistics**

If they say at least one, it is easier to do the question by finding NONE and subtracting that number from 1. At least one would mean, 1, 2 or 3. I agree with a and b. for c, take 1- .001 = .999
*February 26, 2016*

**stat**

.72 times .72 times .72
*February 26, 2016*

**Probability! Check please!**

7!/4!3! 7* 6* 5 * 4* 3 *2 *1 divided by 4*3* 2* 1* 3*2*1 You can cancel like factors 7(6)5) divided by (3)2 = 35
*February 26, 2016*

**math**

62 -40-40 = Can you finish from here?
*February 25, 2016*

**Math**

150 cm /10 cm = x/2000 cm cross multiply to get x 10x = (150)(2000) divide by 10 to find answer in cm. change to meters by dividing by 100.
*February 25, 2016*