Saturday
July 30, 2016

Posts by Bob

Total # Posts: 3,016

Math
Need help solving for x with work shown 2log6(4x)=0 Log2(x)+log2(x-3)=2
January 27, 2016

Chemistry
On the semi - reactions below is correct to say: Li + + 1℮- => Li. Eº = -3,04V. Au 3+ + 3℮- => Au. Eº = + 1,50V. Pb 2+ + 2℮- => Pb . Eº = - 0,13V. Ag + + 1℮- => Ag. Eº = + 0,80V. a) In the semi reaction Ag, the potential ...
January 22, 2016

Finance 101
Given the recent drop in mortgage interest rates, you have decided to refinance your home. Exactly five years ago, you obtained a $150,000 30-year mortgage with a fixed rate of 10%. Today, you can get a 30-year loan for the currently outstanding loan balance at 7.5% interest. ...
January 20, 2016

Math
x^(1/3)(x+3)^(2/3). Doing curve sketching and cannot seem to figure out what the values are to fill out the chart(intervals-f''-behaviour). I can't seem to find the conacvity values, i dont think they exist. How should I prove that they dont exist? Or do they, ...
January 19, 2016

Math
so mainly i relly dont know so good luck
January 19, 2016

Math
mainly i really dont know so goog d luck
January 17, 2016

Math
Esther drove to work at 45 miles per hour. Returned home at 30 miles per hour. If Esther spent a total of one hour commuting to and from work, how many miles did Ester drive to work in the morning?
January 17, 2016

Math
find the extrema of f(x)=x^(2/5), -3<=x<1. I find zero critical points, but the answer says there is a maxima and minima at 0 and -3.
January 17, 2016

ART 4 QUESTIONS PLZ HELP ASAP
Yay Sid is right I got 4/4
January 15, 2016

maths
a cube of material of side 3cm ( nearest mm) and mass 27 grams (nearest 10th of a gram) is placed into a bowl of deep water. Will the material sink or float? explain answer with suitable calcuations
January 12, 2016

Math
which points of f(x)=arcsin(sinx) are not differentiable? And what is the range of this function? How could I do this without graphing? I am just afraid that my test, which does not allow calculators, will have some question asking me to find this information. Also, when are ...
January 11, 2016

English
thank you
January 11, 2016

English
how can i improve thesis statment?
January 11, 2016

Algebra logs please help
Hi
January 11, 2016

Math
y=[(3-4x)^(2/3)]/[(x^2+8)^(1/3)*(7+4x^3)^2]
January 11, 2016

Math- steve? reiny?
1. Let f(x)=x^5 + 2x^3 + x - 1 Find f^-1(3) and (f^-1)'(3)? I have zero idea how to find the inverse of this function at a point 3, and how to take derivative of an inverse. 2.Let f(x)=cosx + 3x Show that f(x) is a differentiable inverse and find f^-1(1) and (f^-1)'(1...
January 11, 2016

Chemistry
In the lab, 5.8 L of methane gas is burned with excess oxygen gas at SATP. How much carbon dioxide gas is produced? **Based on the balanced chemical equation the ratio of methane gas to carbon dioxide is 1:1, this being said, does it make sense that as 5.8 L of methane gas is ...
January 10, 2016

Math
derivative of y=3(2x^(-1/2)+1)^(-1/3). I got -(2x^(-1/2)+1)*(-x^(-3/2))=y' but I don't know how to simplify it into 1/something. When I tried I only got [2x^(3/2)+x^2]/(x^(7/2)). Help with simplifying?
January 10, 2016

geometry
thanks
January 9, 2016

geometry
how can you find the geometric mean?
January 9, 2016

Math
I don't get what you did after log(Y)=Lim x->∞ (1/x)(xlog(5)+log(1+(2/5)^x) . Why is (2/5)^x -> 0, and hence log(1)=0??
January 9, 2016

Math
derivative of lim x->infinite (2^x+5^x)^(1/x)? I do it till [2^xln(2)+5^xln(5)]/(2^x+5^x) and then I can't simplify anymore. Help me out?
January 9, 2016

Math
Find limit as x approaches 0 of (1+sin4*x)^cotx I know how to do this question because there was a "hint“ in the question that said to use natural log. I was just wondering if someone could explain to me why using log works in this case along with l'hopital's...
January 7, 2016

Science
does any one know
January 7, 2016

Math
Could I please get some help for these 3 questions, apologies for asking so many, but they were the ones I was really unsure of: 1. Find an equation for the line tangent to y=ln(x) and that goes through the origin. I have no idea, the ln(x) stuff is confusing me. 2. derivative...
January 6, 2016

Math
The median of 8 numbers is less than zero. At most how many of the numbers are positive?
January 6, 2016

Math
Thank you very much! I get it now. For another question: y'=lim h->0 ((e^x+h)-e^x)/h. So I simplified this and got (e^x)* lim h->0 ((e^h)-1)/h. But I don't understand why and how ((e^h)-1)/h equals 1. Explain?
January 5, 2016

Math
find an equation for the line tangent to the graph of y=arccot(x) at x=1. I found that slope is -1/(1+x^2). I don't know how to evaluate arccot(1) to find y value.
January 5, 2016

Science
How much energy is needed to raise the temperature of 1500g of ice from -21.0 degrees Celsius to 113 degrees Celsius
January 5, 2016

Math
How do I use y=ne^kt formula?
December 23, 2015

Math
I know it's y=ne^kt. How do I use it? Quick answer.
December 23, 2015

Math
What is bacterial growth formula?
December 23, 2015

math
dwight made 13 shots at the basketball game on friday night and made a total of 30 points. she scored 5 more two pointers than three pointers. how many of each type of baskets did she make? Also make equations to help figure it out.
December 20, 2015

science
in addition to body structure and development, which of the following is used to classify animals? Speed, color, DNA or location
December 14, 2015

Math
I'm in sixth grade and I need help on 3(12w+8)+17+9w
December 8, 2015

Algebra
You travel with a boat 90 km downstream with the current in 6 hours and back upstream in 10 hours. Find the speed of the stream and the speed of the boat in still water, assuming that the motion is uniform.
December 7, 2015

chemistry
How to solve this problem in counting atoms 2 pb(CN)2
December 6, 2015

mathmatics
As I read this ((.8R)-5000).75=7500 solve for R, the initial amount. The amount spend is .2 of that R.
December 5, 2015

calculus
I just saw Prof Damon's response. I had the same thought, it was CalTech, Georgia Tech, or MIT. Review his outline first.
December 5, 2015

calculus
The satellite can see to the horizon. So along the surface, let the horizon be a distance r from the upcoming inmpact point. Then in basic geometry, one can reduce this to (d+y)^2=y^2+r^2 (with sherical trig, it is more complicated, but it at small d reduces to the simple ...
December 5, 2015

Mathematics
yes, of course. What you are ignoring is what units is the gradient. For instance 12375 nanometers/mile is a pretty level road. However, 12375meters/mile is a rather steep road.
December 5, 2015

Physics
The pressure goes from 290 to 102 kPa. V=800cm^3*290/102
December 5, 2015

Physics
see other post.
December 5, 2015

chemistry
what reaction?
December 5, 2015

chem.
how many g of Fe2O3 are produced if 3.00 g of Fe reacts?
December 2, 2015

Algebra
Mr. Pilgram needs fencing for his turkey coop. The perimeter is 240 yards. The length is 16 yards longer than the width. What are the dimensions? What is the area?
December 1, 2015

Chemistry
A substance undergoes a first-order decomposition. After 40.0 min at 500 degrees C, only 12.5% of the original sample remains. What is the half-life of the decomposition? If the original sample weighted 243 g, how much would remain after 2 hours?
November 30, 2015

math
a radiator holds 5 gallons. how much of the 30% antifreeze solution should be drained and replaced with pure water to reduce the solution to 9% antifreeze?
November 30, 2015

math
The diagonal of a rectangular storage room is 4 yards long. If its length is 2 times its width, find the dimensions of the room.
November 29, 2015

Social Studies
b;saratoga
November 23, 2015

science
A cube of density 12kg/m cubed is placed in a Eureka tub and releases 0.40m cubed of water. A) What is the edge length of the cube? B) What is the mass of the cube?
November 23, 2015

Chemistry
anyone have a clue how to do this?
November 21, 2015

Math
Megan has 9 yards of fabric. If she uses 5/8 of the fabric to make a quilt, how much fabric does she have left?
November 17, 2015

math
A simple random sample of 800 individuals provides 250 Yes responses.
November 17, 2015

health
hello can anyone answer these question please?
November 17, 2015

health
PLEASE HELP 1. One of your friends plays video games for at least six hours each day and gets upset when he has to eat dinner with his family. This is a sign of? a. An anxiety disorder. b. A phobia c. Bipolar disorder d. An impulse-control disorder 2. A phobia is an example of...
November 17, 2015

Science
my answer would have to be (A) Mrs.Sue do you agree?
November 13, 2015

Science
here's the real question and then answers The search for identity usually occurs during? a) early childhood b) middle childhood c) late adulthood d) adolescence
November 13, 2015

Chemistry
how much heat is required to warm 225 grams of water from -50c to 200 c
November 9, 2015

Algebra
How do I solve: Translate "y more than 4 is -36". Then solve the problem. Hope someone could help me out with this annoying question!
November 8, 2015

Calculus
In a right triangle, the hypotenuse is of fixed length of 15 units, one side is increasing in length by 4 units per second while the third side is decreasing in size. At a certain instant the increasing side is of length 9 units. Find the rate of change of the third side at ...
November 7, 2015

Physics
A golf ball has a mass of 0.05 kg. It is initially at rest, but after being struck by a golf club it is given a speed of 30 m/s. The club and the ball are in contact for 2 ms (.002 seconds).
November 6, 2015

SCIENCE
.) Iodine 131 is a radioactive waste product generated in nuclear power plants. It has a half life of 8 days. If 16 grams was released from the Fukushima power plant 32 days ago, how much is left now?
November 4, 2015

trig
An airplane is flying in the direction 148° with an airspeed of u = 920 kilometers per hour. Because of the wind, its groundspeed and direction are v = 820 kilometers per hour and 140°, respectively (see figure). Find the direction and speed of the wind.
November 2, 2015

math
Breanne and Alison finished a 5 km fun run. Alison finished 400 m ahead of Breanne. Breanne ran at an average speed of 7.2 km/h. What was Alison’s time for the race if she ran at a constant rate for the whole race?
November 1, 2015

HEALTH PLZ ITS OVERDUE
The answers are A, B, B, B, and again, B. Trust me, I did the assessment and got everything right.
November 1, 2015

Trigonometry
Rusty has a photograph that is 8 inches wide x 10 inches long. She wants to enlarge the photograph to make a poster that is 3 feet wide. How long will the poster be?
October 30, 2015

Math Can Someone explain me about this question
where did they get the 11ft?
October 28, 2015

Math Can Someone explain me about this question
Danika has a board that is 4 yards long. How much needs to be sawn off to make the board 2 feet 8 inches long? A) 1ft 4in B)9ft 4in C)8ft 6in D)2ft 6in
October 28, 2015

SCIENCE HELP PLEASE
Stop being a baby. some people need help on these questions.
October 26, 2015

Vector resultant angles
F1 has a magnitude of 9N acting due west, and F2 has a magnitude of 12 N. I know the magnitude is 15 but I don't know the angle and how to calculate it. I need a lot of help for calculating resultant angles.
October 21, 2015

probability
Ivan rolls a dice he the rolls it again what is the probability that the first roll will be odd or the sum will be odd?
October 20, 2015

physics
A duck waddles 2.3m east and 7.0m north. what are the magnitude and direction of the ducks displacement with respect to its original position?
October 19, 2015

Physics
A child stands on a balcony directly above a friend 5.00 m below. Each throws a ball toward the other with the same initial speed of 10.0 m/s. If each catches a ball at the same instant, which child threw a ball first? How much later was the second ball thrown?
October 19, 2015

english
how do i spell english?
October 16, 2015

civics
In every stage of these Oppressions We have Petitioned for Redress in the most humble terms: Our repeated Petitions have been answered only by repeated injury.
October 15, 2015

Math
Brock has a 2 L bottle of iced tea. He poured an equal amount of the iced tea into 8 containers. How many milliliters did rob pour into each container ?
October 8, 2015

math
The middle school band has 56 members. The high school band has 96 members. the bands are going to march one after the other in a parade. the director wants to arrange the bands into the same number of columns. What is the greatest number of columns in which the two bands can ...
October 7, 2015

English assignment
Is there any lying to friend articles? I can't find anything.
October 6, 2015

English assignment
I'm trying to introduce dishonesty around the world in my first sentence of this paragraph. Around the world, there are many cases of dishonesty being committed in the form of lying, cheating and stealing. Is this sentence correct? Is it a good sentence to use as an ...
October 6, 2015

Pre Calculas
7. For the function defined by: f(x)= {x^2, x<=1} {2x+1, x>1} a. evaluate f(0) 8. Solve the following system of equations algebraically. Verify your solution either graphically or by using matrices. 3x-y=0 5x+2y=22 9. Solve the following system of equations algebraically...
October 6, 2015

English assignment
We have to write a one page reflection on honesty, I need help. What are some real world situations in which this value is being violated? What actions does your conscience call you to take to respond to real world situations in which this value is being violated (knowing that...
October 4, 2015

Physics
ayy lmao
October 3, 2015

Physics
help
October 1, 2015

Physics
Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.41 m. The stones are thrown with the same speed of 8.35 m/s. Find the location (above the base of the ...
October 1, 2015

math
all multiples of 12
September 29, 2015

Physics
A car, moving along a straight stretch of high- way, begins to accelerate at 0.014 m/s2. It takes the car 23.2 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s.
September 24, 2015

Vpe
Estimate to 70+146 and got 300 her estimate reasonable explain
September 21, 2015

Logarithm help
Write each expression as a single logarithm I need help really fast. I have to finish this by today. log4^3 + 1/2log4^8 - log4^2
September 19, 2015

Chemistry
I am really lost with this. Calculate the amount of energy released in kJ/mol for the fusion reaction of two 1H atoms to yield a 2H atom and electron: 1/1H+1/1H→2/1H+0/1e The atomic masses are 0/1e (0.0005486 u), 1H (1.00783 u), 2H (2.01410 u), and 3He (3.01603 u). I ...
September 19, 2015

Logarithm help
Use logarithms for these questions After every 10 pages of painting, the ribbon in the dot matrix printer loses about 0.5% of its ink. A) What percent of the ink is left in the ribbon after printing 100 pages and 1000 pages B) write an equation which expresses the percent p of...
September 18, 2015

Logarithm help
Solve to the nearest thousandth. 5^1+x = 2^1-x
September 18, 2015

Geometry
What about the last three c by the 180???
September 17, 2015

Math
21
September 17, 2015


so i divide it by 60?
September 16, 2015

algebra
The wheels of a moving bicycle have 27-inch diameters, and they are spinning at 200 revolutions per minute. How fast is the bike traveling in miles per hour? 27*π*200=16964.6 1mi=63360in 63360/16964.6=3.73 I am not sure if i did it right
September 16, 2015

Math
So 10.25=0.05n+0.1d+0.25q n=3d q=4*d+1 Substitute d and q to the top equation So 10.25=0.05(3d)+0.1d+0.25(4*d+1) Distribute 10.25=0.15d+0.1d+1d+0.25 Simplify 10.25=1.25d+0.25 10.25-0.25=1.25d --> 10/1.25=d--> d=8 plug 8 back into the equations 3*8=n --> n=24 4*8+1=q...
September 16, 2015

Elementary Mathematics
2/5*7/10*9/10
September 12, 2015

Math
Solve this radical equation algebraically: 2x-5(sqrtx)-3=0
September 11, 2015

Pre Cal
Let me try again, because I keep getting something different. This is the problem: ( (2x^-4y-1)(2y^4z^-1) )^-2/2yx^3z^0 Can you please help me simply this. I didn't get what you got. Thanks.
September 7, 2015

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