Posts by Dean
Total # Posts: 212

Chemistry
What is the electron configuration of the element with 27 protons? Is it 1s2 2s2 2p6 3s2 3p6 3d7 4s2 or is that wrong? 
Chemistry
What is the electron configuration of the element with 27 protons? 
Chemistry
If an element has 12 protons and 17 neutrons, how many electrons does it have? I think the answers twelve but I'm not sure? 
Chemistry
Explain why a model of the atom is crucial to understanding chemistry and in explaining the behavior of matter. 
Mathematics
So for (g*f)(3) the answer is 88, right. I have two other: (f + g)(2), the answer would be 12, right and for last qs: f(g(x)), I got 2x^3 + 5x^2  2x 5 Could you please clarify steve if these qs are right. Thanks 
Mathematics
Use f(x) = 2x + 5 and g(x) = x^21 to determine the following( simplified where possible): (g * f)(3) 
physics
There is no picture given to me in order to solve this question. I think so bisector in this question line passing through the midpoint. Any idea what would be the answer 
Chemistry
Potassium superoxide, KO2, is used for producing oxygen and removing carbon dioxide in selfcontained breathing units, space shuttles, and other enclosed spaces. First the potassium superoxide reacts with moisture to release oxygen and produce potassium hydroxide. Then the ... 
math
Select all the expressions that are equivalent to 10w  8 + 6  4w. 2(3w  1) (6w + 3) + (2w  7) 6w  2 (11w  1)  (5w + 3) 3w + 7 + 3w  9 14w + 14 2(5w + 7) 
math
Translate the following statement to an inequality. Then, find the solution. Four times the sum of a number and eight is greater than or equal to negative four. n ? 9 n ? 9 n ? 32 n ? 32 
math
Translate the following statement to an inequality. Then, find the solution. Three times the sum of a number and five is greater than or equal to negative six. n ? 7 n ? 7 n ? 3 n ? 3 
calculus
Ok but then how would I solve this problem? 
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 don't know how to ... 
science
this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when salt is added to ... 
science
If I dissolve 200g in 20 litre of water what is the density of the salty water. please help 
MAth
Do we like need to add them up? 
American Government
B C D A B C D B D C 
Math
$2,000 principal earning 3%, compounded annually, after 3 years. 
SS
Which of the following responsibilities are held by the federal government? Choose all that apply. (2 points) protecting national parks administering healthcare providing Social Security managing intercity traffic creating garbage collection services chartering city ... 
History
Just fyi everybody, Ms. Sue is total bull. She says bull answers and is never right. Don't ever take her sarcastic answers seriously just ignore her. 
math
Two digits over two digits equals three digit decimal (_.__) Can only use 09 once 
Chemistry, Heat and Phase changes(general chem II)
realized my mistake 
Chemistry, Heat and Phase changes(general chem II)
From the data below, calculate the total heat (in J) needed to convert 22.00 g of icea t 6.00 C to liquid water at 0.500 C. melting point at 1 atm: 0.0 C Hfusion: 6.02 KJ/mol cliquid: 4.21 J/g C csolid: 2.09 J / g C My answer is about 300 J short of the correct answer. It ... 
dragon wings
Thx amanda your answers really helped 
STATISTICS
0.0188 
Algebra
It’s funny. I’m talking to a messenger of God on a homework help website. 
Art
CAS!! did you eat my pie 
Biology
Suggest why Ia and Ib alleles are dominant over Io allele. Why in IaIo genotype, the Io allele is masked 
Life orientation
Give five consequences that xenophobia have on comunities. 
exams
Could you please give me some details about SAT scholarship exam? 
Algebra
1. Tell whether x and y show direct variation. a. 5x  3y = 0 b. x = y  2 / 9 2. The variables x and y vary directly. Use the values to find the constant of proportionality and write an equation that relates x and y. a. y = 4; x = 6 b. y = 2; x = 10 
Physics
A tiny source emits sound uniformly in all directions. The intensity level ar a dist. Of 2m is 100dB. How much sound power is the soure emitting? 
math
Ted is helping his father plant their vegetable garden this year. They will put a fence around the garden. Ted measures the length of the garden, which is 6 feet. His father tells him that the width is twice the length. How much fencing do Ted and his father need to buy yo ... 
chemistry
Calculate the volume 2.3g of oxygen gas at 28 degrees celcius and 2.321 atm 
Math
Need help with this. A concrete path of width 1m and thickness 10cm is to be placed around you pool. Find the number of cubic meters of ready mixed concrete required to lay the path. Additional Info: pool area is 25.75 without concrete around it. I have completely forgotten ... 
Geograph
Where is Indonesia ? 
Chemistry
A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 65.0 mL of 0.650 M NaOH were added? (c) What would the pH be if 40.0 mL ... 
Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be? 
Physics
Suppose you had a circuit with three resistors in series and you measured I=7.0 milliamps; V = 14.7 volts; V1= 3.5 volts and V2 = 1.4 volts. What would be the voltage across the third resistor? What would its resistance be? 
question/curiousity
Theyre collaborating to write a children book 
question/curiousity
A nurse decides to write a book, and a lawyer decides to illustrate the book.. what do the two have in common? my ans: Two potentially turn a hobby into a second career? 
Geometry
Can you help me.the lengths of the sides of a triangle are in the extended ratio 3:10:12. The perimeter is 400cm. What is the length of the longest side in centimeters. 
Science
Desn 
math
Thank you 
math
Jake has $2.80 in dimes and quarters. he has 7 more dimes than quarters. how many quarters does he have? 
Science**updated asnwers**
Thats a metaphor 
physics
A block with mass m = 24.0 kg slides down an inclined plane of slope angle 41.4 ° with a constant velocity. It is then projected up the same plane with an initial speed 3.80 m/s. How far up the incline will the block move before coming to rest? 
physics
Buffy is rolling along in her 12.7 kg wagon at 3.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.2 m/s relative to the ground. This causes her wagon to go speeding forward at 9.51 m/s relative to the ground. How much does Buffy... 
physics
A block of wood with a mass of 4.62 kg sits on the edge of a table that is 0.99 m tall. A bullet with a mass of 70.5 g traveling with a speed of 450 m/s is shot into the block and is lodged in it. Assuming that no energy is lost to friction, how far from the table will the ... 
physics
A balistic pendulum is made from a block of wood with a mass of 2.78 kg. A bullet with a mass of 39 g is shot into the block causing it to rise 29.1 cm. What was the speed of the bullet? 
Electronics
Why don't you simplify it then put it into an algebra calculator. then hire jericho before you rig up megaton to get into tenpenny tower. Fallout 3 ftw! 
Physics
An electron is released between two metal plates 40.0mm apart experiences an acceleration of 1x10^12m/s^2. Determine the potential difference across the plates. 
Surveying
I am looking for horizontal distance between 2 points. My slope distance is 153.97' and a vertical distance of 91degrees 32minutes 45seconds. 
statistics
a random sample from the population of registered voters in california is to be taken and then surveyed about an upcoming election. What sample size should be used to guarantee a sampling error of 3% or less when estimating p at the 95% confidence level? is this the answer...... 
statistics
assume you have a data set from a normally distributed random variable. answer the following: will the random variable be discrete, continuous, or neither? How do you know? I believe its continuous but cant explain why will the data be qualitative or quantitative? How do you ... 
statistics
A woman and her son are debating about the average length of a preacher's sermons on Sunday morning. Despite the mother's arguments, the son thinks that the sermons are more than twenty minutes. For one year, he has randomly selected 12 Sundays and found an average ... 
statistics
What sample size is required from a very large population to estimate a population proportion within 0.05 with 95% confidence? Don't assume any particular value for p. A. 271 B. 38 C. 385 D. 767 
math
2) binomial: n=6 p=0.48; x=6 using applet:1.22306% 11.22306%=98% 
math
1)average=4; SD=0.2;sample =100 the expected total = 100*4=400 SE of total= sqrt(100)*0.2=2 (100*3.999400)/2=0.05 using applet:5...0.05 approximately 48% 
math
1)average=4; SD=0.2;sample =100 the expected total = 100*4=400 SE of total= sqrt(100)*0.2=2 (100*3.999400)/2=0.05 using applet:5...0.05 approximately 48% 
math
how to go by doing a personal cash flow statement is it like the regular budgetfor your house. 
physics
.14 T 
Algebra
The volume of it is 1125 cubic inches, the length is 18 inches, and the width is 15 inches. Can you also show me how to do because I have a test on Friday! Thanks!!! :) 
Chemistry
Thank you for a very good explanation! :) 
Chem
in the reaction NO3+CaCl2=2AgCl+Ca(NO3)2, how many grams of excess will remain when 20 grams of AgNO3 are reacted with 15 grams of CaCl2 
Math
I think it would be C but I'm not sure..... 
ap physics
Awesome generated quite q bit of discussion. :) 
math
how many ways can you arrange three banks on a shelf 
finance
what is the future value of $2,000 in a bank account for 6 years at 4 percent compounded bimonthly 
Discreet MAth
Wow hes actually right 
stat
Did anyone answer this? 
Accounting
Spencer Company manufactures and sells three products. Relevant per unit data concerning each product are given below. Product A B C Selling price $9 $12 $14 Variable costs and expenses $3 $9.50 $12 Machine hours to produce 2 1 2 Compute the contribution margin per unit of the... 
Accounting
Imagen Arquitectonica of Tijuana, Mexico is contemplating a major change in its cost structure. Currently, all of its drafting work is performed by skilled draftsmen. Alfredo Ayala, Imagen's owner, is considering replacing the draftsmen with a computerized drafting system... 
Accounting
E69 (a,b) Tiger Golf Accessories sells golf shoes, gloves, and a laserguided rangefinder that measures distance. Shown below are unit cost and sales data. Pairs of Shoes Pairs of Gloves Range Finder Unit sales price $100 $30 $250 Unit variable costs 60 10 200 Unit ... 
math
if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop? this is happening with a full brake lock up.skid!in a stright line. 
math
if a 1100 lb motorcycle(w/2 passengers)is doing 40mph,how long will take to come to a complete stop? 
Physics
A 170 pF capacitor is connected in series with an unknown capacitance, and as a series combination they are connected to a battery with an emf of 25.0 V. If the 170 pF capacitor stores 135 pC of charge on its plates, what is the unknown capacitance? 
calculus
We need the given interval 
Algebra II
f(1)=(1)^2 (1)+1=3 g(3) =3(3)+6=3 3 times 3 = 9 
math
f(x) = y y = 2log(base2)x =log(base2)x^2 therefore 2^y=x^2 so x = sqrt(2^y) 
algebra
g(5)=4(5)+3=23 f(23) = 2(23)7 = 53 (f o g)(5) = 53 
math
a boy buy a bike for 45$ then sells it for 65$ then buys it back for 90$ then sells it agian for 125$ what percent of money did he make 
calculus
Evaluate integral from 2 to 3 of 4 lxldx 
stati
12. Suppose 80% of students finish high school. Of them, 50% finish college. Of them, 20% get a master’s degree. Of them, 30% get a Ph.D. (i) What percentage of students get a Ph. 
statistics
Assuming that the data are normally distributed with a mean of 45 and a standard deviation of 3.25, what is the zscore for a value of 40? 
french
yes it that just not sure about the spelling 
algebra
Find the slope, if it exists x+5y=10 
algebra
Find the slope, if it exists x+5y=10 
MATH HELP HELP HELP HELP HELP BOBOBOBOBOBOBOBOBOB
Let a = 349, M = 492186. Show that gcd(a;M) = 1. Hence find the mutliplicative inverse, a^1 mod M 
Math
A company has factories located in New Jersey, Ohio, and Georgia where it manufactures handbags, shoes, and belts. How many days should the company operate each factory in order to exactly fill the order of 2150 handbags, 2300 shoes and 2500 belts? Use the information below. ... 
CRIMINAL JUSTICE
Discuss the three types of management styles that are reviewed in your course materials (Scientific Management, Human Relations Management, and Systems Management). * Which style do you believe would be the most effective to use in the criminal justice system? * What are ... 
math
Thank you Sue! My daughter says she thinks she has it now. I hope she does, because I am till confused. You know its true what they say, It's hard to teach an old dog new tricks. Thanks again, Dean 
math
I came out with a common denominator of 72. do I just put 5/72 + 2/72 = 3/72? I haven't done Algeria in 50 years. I am very rusty. 
math
how do you add a negetive and a positive faction? 5/8 + 2/9 = ? 
algebra
write a linear equation to model the situation. Use unit analysis to check your model. You borrow $40 from your sister. To repay the loan, you pay her $5 a week. 
8th grade
Solve 3r + 18 ¡Ü 6r 
science
Actually, I really just need someone to confirm my answer. Not to confident b/c it's been a while since I've done much math. 22 ears x 700 kernels = 15,400 15,400 x 1000 = 15,400,000 /90 = 171.111 Am I close? 
science
A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. ... 
Human Physiology
A subject with a body weight of 60 kg was injected with 10 ml of a 1% (w/v) solution of Evans Blue. After 10 min, the blood was sampled and found to contain 0.035 mg ml^1 of the dye. What is the subject’s plasma volume in litres? 
Biology
During skeletal muscle contraction: Choose one answer. A. the A and I bands do not change length. B. cross bridges are formed between myosin and actin. C. minimal tension can be generated when the muscle is close to its normal resting length. D. the myofilaments change length...