# Posts by John

Total # Posts: 8,427

**Math**

16 more than a number divided by 4 16 + n/4 Antoine is correct. Zach's would be the sum of 16 and n divided by 4.

**length of similar shapes**

If they are similar then there sides are all in the same proporiton. 25/10 = 2.5 the ratio is 2.5 4cm long times 2.5 = 10 How would you find the width 7cm times ___ = ____

**chemistry**

25(.5) = 25(x)

**Math**

On your graph on the x-axis, you will have time 1, 2, 3, 4, On your y-axis put the miles d = 20t

**Math**

t = 19+ 15 L I think your teacher will want the 19 included in the total time. If not, then t = 15L

**Stastics**

I believe it is n-2 when doing a two sample t.

**Stastics**

I agree with c.

**Itt tech**

All you do is substitute -3 for x. 5(-3) + 8 = 0

**Stastics**

The 99% confidence interval is wider than the 95%. If something is in the 99% then it has to be in the 95% interval Since it seems that a and d would be correct, it makes me think that your teacher is trying to show you that confidence intervals can always be different because...

**stastics**

for t to get larger you will need the numerator of the problem to get larger and the denominator to get smaller. The formula has the difference between the means divided by the standard deviation. I would say d. The standard deviation decreases and the difference between the ...

**Statistics**

9% more Do you want to do a two sample test to see if 41% is statistically greater than 32%. If so, we need more information.

**Math**

rectangular area for cattle and uses a straight portion of a river as one side of the rectangle, as illustrated in the figure. Note that there is no fence along the river. If the farmer has 16001600 feet of fence, find the dimensions for the rectangular area that...

**counseling**

Don't see the choices.

**Algebra**

1-3 are correct. I don't see the x in #4 You would chose your x, so the value on the radical sign would never be negative. It would have to be > or equal to zero. If your question is square root of (3 +3x) then you want this expression to be equal to or greater than ...

**Stastics**

I agree with your confidence interval. Nice work. Since .80 isn't within the interval, you are correct to say no as the answer to that question. random variable p should be the percent or proportion of student who drive.

**Business Math**

Lisa Richter deposited $5,000 at 4% compounded semiannually for three years. At the beginning of the fourth year, Lisa deposited $2,500. What would her balance be at the end of five years assuming she is still earning 4% compounded semiannually?

**Trigonometry**

Right triangle tan of 38 = x/125 Find the tan of 38 and multiply by 125 to get your answer.

**Math**

12 because 12 divides into both 36 and 12 If you were asked to factor,the answer would be: 12(3x+y)

**Chemistry**

At equilibrium at 1.0 L vessel contains 22.00 mol of H2, 20.00 mol of CO2, 13.00 mol of H2O, and 5.700 mol of CO at 427◦C. CO2(g) + H2(g) ⇀↽ CO(g) + H2O(g) What is the value of K at this temperature for the reaction?

**math**

Question 1 To make the confidence interval, you need to find the mean and the standard deviation for the data. Since this is a small sample and you don't know the population standard deviation, you will use "t" instead of "z". Using a t-table you will ...

**LA**

There is no passage.

**math HELP**

can't see the graph.

**stat**

50-60/20 = -.5 z score Look that up to find the % You want z<-.5 10-60/20 30-60/20 -2.5 and -1.5 are the z-scores find the % by finding -2.5<z<-1.5 Can you submit your answers so they can be checked.

**math**

y = 25+10x or y = 10x+25 y = 18 + 15x or y = 15x + 18 Here are you two equations. to solve by substitution 10x + 25 = 15x + 18 Solve for y and then find x.

**Dosage calculations**

Thank you!

**Dosage calculations**

1000 mL has been infused in 8 hours at 150 ml/hr. After 3 hours, how many have been infused? 1000/8 = 125 ml 125 x 3 =375ml? Therefore after 3 hours 375ml has been infused Is this correct?

**Chemistry**

We did an experiment where we had to figure out the amount of water molecules in CuSO4xH2O (x being the value to find). If the stirring rod used was wet and was used to stir the beaker would this result in a higher x value? Is this a experimental or human error. Obviously this...

**Physics**

a 2x10^-6 point charge travels a distance of.002m between two parallel charged plates from the negative end toward the positive end. The field has a strength of 500 N/C What is the change in voltage?

**child development**

the continues development views hold that

**Physics**

An electric field measured near a point charge of 3.0 X 10^-6 C has a strength of 1.50 X 10^5 N/C How far is the point from the source charge

**Health**

The lungs are? A. Connected by the mediastinum B. Separated by the mediastinum C. Divided into 7 lobes D. Divided into 9 lobes C?

**Physics**

If one charge (+5 uC) is placed at origin and a second charge of (+7 uC) at x = 100 cm, then where can a third charge be placed and of what size, so that it has no electrostatic force on it. I know the magnitude of the force will not matter, however, I'm not sure as to how...

**chemestry**

0.63g of pb powder were disolved in excces nitrate(v) aci to forn leadnitrate solution, all the lead nitrate solution were reacted with sulphate,give the ion equationof the reaction between lead nitrate and sadium sulphate solution?determine the mass of the lead salt formed in...

**calcus**

water partially fills a hemispherical bowl of radius 40cm so that the depth of the water is 20 cms. write down an integral representing the volume of the water in the bowl

**Dosage calculations - Bob, please help**

Weight - 20 pounds 6 ounces Ordered dose - 1.5mg per kilogram per day recommended dosage from drug label - 3mg every 8 hours. 1.What is the individual dose? to find the individual dose i'll first convert pounds to kg which is 9.26 kg. I will then multiply 1.5 x 9.26 = 13....

**Dosage calculations please**

What is the maximum dose client could have? I would multiply the weight x the recommended dose which equals to 863.5 mL.

**Dosage calculations please**

Nurse orders 375mL every 8 hours, client weighs 38 pounds. Recommended dose is 50ml 1. pounds to kg -> 17.27 kg 2. individual dose is 17.27 x 375 = 6476.25 mL 3. Daily dose is 6476.25 x 3 because 24 hours divided by 8 = 3. therefore the daily dose is 19,428.75 mg. Is this ...

**Dosage calculations please**

Ahh and I would multiply 38 x 4 to get the daily dose because 24 hours/6 = 4 therefore the daily dose is 152mg

**Dosage calculations please**

The nurse is to administer the recommended dose of Garamycin 2 mg per kg every 6 hours. The child weighs 42 pounds. 1. What is the weight in kg? 2. what is the daily dose? Round to the nearest whole number. 3. What is the individual dose? 1. 42/2.2 = 19.09 2. daily dose = 19....

**Maths Physocs**

J and K are cycling together. K is riding a bike with a wheel radius of 35cm, crank wheel radius 11cm and chain wheel radius 4cm. She is pedalling at 60 rpm. How fast is she going? -->What is the significance of giving 3 different types of radius? --> know to find ...

**Social Studies Please tell a summary**

Can some one HELP!!!!! Select one form in movement from the progressive era. Provide details and examples that Sapor how this movement change South Carolina.

**yakima community college**

can't you just use the 5/9 celsius to fahrenheit conversion equation? Don't be lazy, just write down the formula and plug in the numbers where there are letters

**help my son's math**

Jamie = Antonio + 8 Antonio = 3 times Beth If Beth completed 6 then Antonio completed 18 Jamie completed 26

**Math**

This is a probability problem 5!/(3!2!) =10 different ways.

**Health**

The answer is not B

**Health**

What?

**Health**

The skin helps eliminate waste from the body through _____. A. Striation B. Respiration C. Irritation D. Perspiration B?

**Please Help ! Calculus**

x + y = 42 y = 42-x x(42-x) 42x-x^2 derivative 42 -2x =0 x=21 y =21

**Geometry**

An easier way would be to find the perpendicular and use pythag. Thm c^2 = a^2 + b^2 15^2 = 4^2 + b^2 b = 14.45 A = 1/2 bh A= 1/2 8 x 14.45 you will get the same answer as above. Depending on the level you are working at this might be what your teacher is looking for.

**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(...

**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...

**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 ...

**Biology**

The cells in them are the ones that control them

**Chemistry**

what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57

**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

**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?

**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 :)

**Maths**

2x^3 - 12x^2 - 32x

**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.

**Dosage calculations**

I did this 0.5/ 100 x 1 = 0.005 but the answer is 1.5ml.

**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.

**Math**

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

**Chemistry**

I'm stuck.

**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.

**Chemistry**

Hey Dr. Bob. I'm not sure where you got the 1.6E-8 from?

**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.

**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?

**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 ...

**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?

**History Help!**

Is it d?

**History Help!**

It says that they wanted the rich land, but none of my answers relate to this. @Reed

**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...

**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.

**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...

**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?

**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!

**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.

**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.

**statistics**

what is the range of probability

**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...

**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 ...

**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 ...

**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?

**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...

**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?

**Trigonometry**

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

**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

**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.

**Physics**

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

**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.

**life orientation**

Four aspects when choosing subjects

**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

**Math**

Convert 9 pounds 6 ounces into Kg.

**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 ...

**math**

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

**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...

**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

**Pre-algebra**

I agree.

**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.

**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